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Tytuł:
Gas exchange in valved two-stroke SI engine
Autorzy:
Buczek, K.
Mitianiec, W.
Powiązania:
https://bibliotekanauki.pl/articles/245914.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
engine development
two-stroke engine
boosting
Opis:
The paper describes the work of high speed charged spark ignition overhead poppet valve two-stroke engine, which enables to achieve higher total efficiency and exhaust gas emission comparable to four-stroke engines. The work of such engines is possible by proper choice ofvalve timings, geometrical parameters of inlet, outlet ducts and charge pressure. The engine has to be equipped with direct fuel injection system enabling lower emission of pollutants. The work is based on theoretical considerations performed in GT-Power in previous authors' research and carried out in CFD code (KIVA 3 V) for different engine configurations. The initial results included in the paper show influence of inlet port geometry and charge pressure on engine scavenging process. Additionally, optimum fuel spray injector position was considered in order to obtain proper fuel vaporization and avoid significant wall-wetting. The simulation results show that the nitrogen oxides arę considerably reduced in comparison to four-stroke engines because ofhigher internal exhaust gas recirculation. The innovation of this proposal is applying of poppet intake and exhaust valves with turbocharging in the two-stroke engine and obtaining a significant downsizing effect. The conclusion shows the possibilities of proper gas exchange process in this type of two-stroke engine and thus, the feasibility of its application as a power unii for transportation means with higher total efficiency than traditional engines with possible change of engine work in two modes: two- and four-stroke cycles.
Źródło:
Journal of KONES; 2010, 17, 1; 73-80
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of direct fuel injection in a small power two-stroke engine
Autorzy:
Mitianiec, W.
Forma, M.
Powiązania:
https://bibliotekanauki.pl/articles/242265.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
engine development
two-stroke engine
direct fuel
Opis:
Small power two-stroke engines can be competitive in regard of work parameters and pollutants emission in relation to four-stroke engines at some modifications, particularly changing of fuelling system. The paper presents a modifted air-assisted direct fuel injection in a two-stroke engine, which changes propagation of fuel jet in the combustion chamber. The main problem of mixture formation is short time for fuel evaporation after injection which should begin after closing of the exhaust port. The paper shows interaction between the scavenge air, additional air stream and fuel jet from the injector located in the cylinder head, which can induce the small size of fuel droplets and fast evaporation. The computational results of fuel mixture formation and combustion process in direct fuel injection two-stroke engine Robin EC-12 with capacity 115 cm3 are presented. The simulation was carried out by use KIVA code with assumption of initial parameters from the experimental tests on the carburetted engine. Setting of the injector in a regard of the cylinder head decides of fuel motion and evaporation in the combustion chamber. Air-assisted fuel injection influences on higher mixing of fuel and better combustion than by using DFI system. The paper shows phases of mixture formation, combustion and concentration of the combustion product in the cylinder with additional air stream. Spray guided high pressure direct injection system in SI two-stroke engine enables fulfil the restrictions of gas emission of one-wheeler vehicles and small power units.
Źródło:
Journal of KONES; 2009, 16, 2; 337-347
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A valved two stroke engine as a new power source
Autorzy:
Mitianiec, W.
Buczek, K.
Powiązania:
https://bibliotekanauki.pl/articles/245638.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
engine development
two-stroke engine
valve timing
pollutants
Opis:
The present work defines main conception of modern, efficient and ecologic two-stroke engine. It indicates the scope of necessary modifications that have to be made in typical four-stroke engine to prepare it to work in two-stroke mode. Taking into account some limitations (especially in valve train design) authors performed several analyzes in order to check the possibility of proper scavenging process and obtain main engine characteristics. The paper contains description of simulation approach and selected mathematical models that was applied in carried over analyzes. The results of foregoing simulations, which were obtain taking advantage of GT-Power software should be considered as preliminary since several parameters have to be defined during research and 3D simulations. In order to expose advantages of modern two-stroke engine a simple comparison of it and its predecessor was performed taking into consideration BSFC maps. The objects of simulation were fluid flow, scavenging and combustion. This comparison indicates that proposed two-stroke engine achieve significantly less break specific fuel consumption (up to 27 g/kWh drop). Paper presents diagram of new type two-stroke engine with poppet valves, which is probably the most feasible layout of two-stroke engine, and GT-Power model of simulated single-cylinder engine based on four-stroke single cylinder engine.
Źródło:
Journal of KONES; 2009, 16, 3; 259-268
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of the amount of waste cold from liquefied natural gas (LNG) regasification for gas-fuelled low-speed main engines
Autorzy:
Korlak, Piotr Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2175557.pdf
Data publikacji:
2021
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
LNG
regasification
waste cold
EEDI
EEXI
low-speed engine
two-stroke engine
Opis:
Existing and future regulations on ship energy efficiency and methods for their improvement are presented in this work. The design and operational features of gas-fuelled low-speed main engines, liquefied natural gas (LNG) regasification conditions, and amount of waste cold are compared. Using a simple linear regression model based on the least squares method, formulae were developed to predict the amount of waste cold as a function of the brake power of gas-fuelled low-speed main engines operating under ISO ambient conditions in Tier III-compliant mode. A sufficiently accurate prediction of the waste cold amount at the initial design stage is feasible due to the formulae developed as part of this work
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 68 (140); 69--79
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of four-stroke engine for operation in two-stroke cycle for automotive application
Modyfikacja silnika czterosuwowego do obiegu dwusuwowego do zastosowań motoryzacyjnych
Autorzy:
Mitaniec, W.
Buczek, K.
Powiązania:
https://bibliotekanauki.pl/articles/133678.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
transport
engine development
two-stroke engine
boosting
silniki spalinowe
doładowanie
spalanie
sprawność silnika
Opis:
The main disadvantages of two-stroke engines such a big fuel consumption and big emission of hydrocarbons or carbon monoxide can be reduced by new proposal of design of two stroke engine based on four stroke engines. The paper describes the operation of high supercharged spark ignition overhead poppet valve two-stroke engine, which enables to achieve higher total efficiency and exhaust gas emission comparable to four-stroke engines. The work of such engines is possible by proper choice of valve timings, geometrical parameters of inlet and outlet ducts and charge pressure. The engine has to be equipped with direct fuel injection system enabling lower emission of pollutants. The work is based on theoretical considerations and engine parameters are determined on the simulation process by use GT-Power program and CFD program for different engine configurations. The initial results included in the paper show influence of valve timing on engine work parameters and predicted exhaust gas emission. The simulation results show that the nitrogen oxides are considerably reduced in comparison to four-stroke engines because of higher internal exhaust gas recirculation. The innovation of this proposal is applying of variable valve timing with turbocharging system in the two-stroke engine and obtaining a significant downsizing effect. The conclusions shows the possibilities of applying two-stroke poppet valve engine as a power unit for transportation means with higher total efficiency than traditional engines with possible change of engine operation in two modes: two- and four stroke cycles.
Główne wady silników dwusuwowych, takie jak duże zużycie paliwa i duża emisja węglowodorów oraz tlenku węgla mogą być wyeliminowane przez propozycję nowej konstrukcji silnika 2-suwowego opartego na silniku 4-suwowym. W artykule przedstawiono pracę wysoko doładowanego górnozaworowego silnika 2-suwowego, który umożliwia uzyskanie większej sprawności niż silnika 4-suwowego przy utrzymaniu emisji szkodliwych składników spalin na poziomie silników 4-suwowych. Silnik jest wyposażony w bezpośredni wtrysk paliwa umożliwiający mniejszą emisję szkodliwych składników spalin. Przedstawiono osiągi silnika, które określono na podstawie symulacji w programie GT-Power oraz przy użyciu programu CFD. Silnik został zmodyfikowany przez zmianę systemu zaworowego i faz rozrządu dla pracy w cyklu 2-suwowym. Zaprezentowano zmiany zachodzące w parametrach termodynamicznych cylindra w czasie wymiany ładunku dla wersji 2- i 4-suwowej. Proces spalania był modelowany za pomocą prostych reakcji kinetycznych dla węglowodorów i tlenków azotu oraz reakcji dysocjacji. Wyniki symulacji wskazują, że emisja tlenków azotu jest znacznie mniejsza w porównaniu z silnikiem 4-suwowym z powodu dużej wewnętrznej recyrkulacji spalin. Innowacją w proponowanym silniku dwusuwowym jest zmienność faz rozrządu z doładowaniem turbosprężarkowym i uzyskanie znacznego zmniejszenia gabarytów silnika (downsizing). Podano także możliwość zastosowania górnozaworowego silnika 2-suwowego jako jednostki napędowej dla środków transportu o większej sprawności niż tradycyjne silniki, z możliwością pracy zarówno w cyklu 2-suwowym, jak i 4-suwowym.
Źródło:
Combustion Engines; 2015, 54, 3; 3-12
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANN based evaluation of the NOx concentration in the exhaust gas of a marine two-stroke diesel engine
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/258708.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
artificial neural network
marine two-stroke engine
NOx concentration
Annex VI to Marpol Convention
Opis:
The article presents results of a study on the possible application of artificial neural networks (ANNs) to the evaluation of NOx concentration in the exhaust gas of a marine two-stroke Diesel engine. A concept is presented how to use the ANN as an alternative to direct measurements carried out on a ship at sea. Methods of proper ANN selection, configuration and training are presented. Also included are the results of laboratory tests, performed to obtain data for ANN training and tests, and the results obtained from modelling certain processes with the aid of selected ANNs. As a result of the performed investigations, an ANN was constructed and trained to calculate NOx concentration in the Diesel engine exhaust gas based on the engine operation parameters measured with an average error of 1.83% , and the fuel consumption measured with an average error of 1.12%.
Źródło:
Polish Maritime Research; 2009, 2; 60-66
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Turbocharging the aircraft two-stroke diesel engine
Autorzy:
Karpiński, Paweł
Pietrykowski, Konrad
Grabowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/133547.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
aircraft engine
two-stroke engine
diesel engine
turbocharger
supercharger
silnik lotniczy
silnik dwusuwowy
silnik wysokoprężny
turbosprężarka
supersprężarka
Opis:
The power and efficiency of a two-stroke engine strongly depends on the efficiency of the scavenging process which consists in removing the rest of the exhaust gases from the cylinder and filling it with a fresh charge. The quality of the charge exchange process is significantly influenced by the construction of the intake system. The paper presents a zero-dimensional model of the aircraft two-stroke opposed-piston diesel engine with two variants of the intake system: with a mechanical compressor and a turbocharger connected in series with a mechanical compressor. Simulation studies of the developed cases were carried out in the AVL BOOST software. For the defined engine operating points, its performance was compared for different designs of the intake system. It was confirmed that the use of a turbocharger with a mechanical compressor extends the range of operating at high altitudes.
Źródło:
Combustion Engines; 2019, 58, 3; 112-116
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of axial motions of piston rings in a two-stroke engine by using back light of LED
Autorzy:
Nakashima, K.
Mizuno, M.
Usami, H.
Powiązania:
https://bibliotekanauki.pl/articles/244371.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
two-stroke engine
piston ring
cylinder port
axial motion of piston ring
LED
transparent cylinder
Opis:
In two-stroke engines of the crankcase-compression type, the piston rings slide over not only the cylinder wall but also the cylinder ports. It is important for piston ring designers to understand how piston rings behave over cylinder ports. In order to clarify the axial motion of piston rings in two-stroke engines, we established a measurement method using light-emitting diodes (LEDs). We attached LEDs inside the piston, and leaked the backlight of LEDs through the side clearance between the piston ring side face and the piston ring groove side face. From the position of the leaked backlight in the piston ring groove, we determined the axial ring position in the ring groove. Our experiments set this piston with LEDs in an experimental two-stroke engine with a transparent cylinder, and investigated the effects of intake and exhaust ports on axial ring motion under motoring operations. Results indicated that the rings moved in the axial direction by the ring projection and catching in the intake and exhaust ports.
Źródło:
Journal of KONES; 2018, 25, 3; 363-369
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the injection timing on the performance of two-stroke opposed-piston diesel engine
Autorzy:
Karpiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/117835.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
diesel engine
opposed piston engines
two-stroke engine
injection timing
silnik wysokoprężny
przeciwstawne silniki tłokowe
silnik dwusuwowy
czas wtrysku
Opis:
The performance of the engine strongly depends on the parameters of the combustion process. In compression ignition engines, the fuel injection timing has a significant influence on this process. The moment of its occurrence and its duration should be chosen so that the maximum pressure value occurs several degrees after TDC. In order to analyze the effect of the fuel injection timing on the performance of the tested two-stroke opposed-piston diesel engine, a zero-dimensional model was developed in the AVL BOOST program. Next, a series of simulations were performed based on the defined calculation points for maximum continuous power, which resulted in power, specific fuel consumption and mean in-cylinder pressure. Finally, the engine map was made as a function of the start of combustion angle.
Źródło:
Applied Computer Science; 2018, 14, 2; 69-81
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internal two-stroke combustion engine with pneumatic injection of liquid biofuel
Dwusuwowy silnik spalinowy z pneumatycznym wtryskiem ciekłych biopaliw
Autorzy:
Marek, W.
Powiązania:
https://bibliotekanauki.pl/articles/263259.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
biopaliwo
dwusuwowy silnik spalinowy
sterowanie
biofuel
control
two-stroke combustion engine
Opis:
In this article the possibilities of liquid biofuel injection control in two-stroke engines are presented. This is a low cost in-cylinder fuel injection system for stratified charge engines which is much simpler than alternatives. The author worked out a system of pneumatic fuel injection by means of hot exhaust gases (according to conception Prof. St. Jarnuszkiewicz) drawn from one cylinder during the working stroke and, following the addition of fuel, forced into another cylinder during the compression stage. Spraying and injection of fuel by means of hot exhaust gases give additional possibilities of complete evaporation of light fuels, alternative fuels with extended fraction and heavier fuels, such as diesel oil, kerosene and vegetable oil. In the combustion system presented the process of preparing liquid hydrocarbon fuel for combustion is one of the main factors influencing the efficiency of the conversion of chemical energy contained in the fuel to mechanical energy. The most significant is the fuel phase transition, and especially a repeatability of the fuel dose per cycle. This process is inseparably associated with the physical properties of fuel, and changes of rate of pressure in gas duct. In practice, a two-stroke internal combustion engine with spark ignition and pneumatic injection accomplished by means of exhaust gases successfully uses liquid fuels with very different fractional and group composition, which may be very beneficial from the viewpoint of practical realization of utilization processes. The results of tests shown it is possible to reach a high repeatability of the fuel dose per cycle and maintaining uniform fuel doses for each cylinder.
W artykule zaprezentowano wyniki prac dotyczących zagadnień sterowania wtryskiem ciekłego biopaliwa w dwusuwowych silnikach spalinowych o zapłonie iskrowym. Badania przeprowadzono na dwusuwowym silniku spalinowym o zapłonie iskrowym wyposażonym w prosty konstrukcyjnie system wtrysku pneumatycznego umożliwiający uwarstwienie ładunku. Istota działania tego systemu (oparta na koncepcji prof. St. Jarnuszkiewicza) polega na wykorzystaniu energii części gazów spalinowych jednego cylindra dla dokonania wtrysku paliwa do drugiego cylindra. Uzyskuje się w ten sposób znaczną poprawę rozpylenia i odparowania dawki paliwa, w stosunku do rozwiązań alternatywnych, co stwarza potencjalne możliwości stosowania ciekłych paliw o tzw. rozszerzonej frakcji oraz paliw alternatywnych na bazie olejów roślinnych. W prezentowanym systemie zasilania i spalania proces przygotowania ciekłego paliwa węglowodorowego jest jednym z głównych czynników wpływających na sprawność zamiany energii chemicznej paliwa na energię mechaniczną. Najbardziej znaczącym jest proces zmiany postaci fazowej paliwa oraz powtarzalność dawkowania paliwa na cykl roboczy. Zagadnienia te są nierozerwalnie związane z fizycznymi właściwościami biopaliwa oraz przebiegiem zmian ciśnienia w przewodzie gazowym systemu wtrysku pneumatycznego. W efekcie przeprowadzonych prac uzyskano zadawalającą powtarzalność dawkowania oraz rozdziału paliwa dla każdego cylindra. W praktyce eksploatacyjnej silnik z prezentowanym systemem wtrysku może być zasilany paliwami o zróżnicowanym składzie frakcyjnym i grupowym, co stwarza dodatkowe możliwości z punktu widzenia praktycznej realizacji procesów utylizacyjnych.
Źródło:
Archiwum Motoryzacji; 2008, 1; 91-99
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic simulation comparison of opposed two-stroke and conventional four-stroke engines
Autorzy:
Shokrollahihassanbarough, F.
Alqahtani, A.
Wyszynski, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/133447.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
opposed piston two-stroke engine
AVL Boost software
thermodynamic benefits
conventional crankshaft engines
silnik dwusuwowy
korzyści termodynamiczne
Opis:
Today’s technology leveraging allows OP2S (Opposed Piston 2-Stroke) engine to be considered as an alternative for the conventional four-stroke (4S) engines as mechanical drive in various applications, mainly in transportation. In general, OP2S engines are suited to compete with conventional 4-stroke engines where power-to-weight ratio, power-to-bulk volume ratio and fuel efficiency are requirements. This paper does present a brief advent, as well as the renaissance of OP2S engines and the novel technologies which have been used in the new approach. Also precise thermodynamic benefits have been considered, to demonstrate the fundamental efficiency advantage of OP2S engines. Hence, simulations of two different engine configurations have been taken into consideration: a one-cylinder opposed piston engine and two-cylinder conventional piston four-stroke engine. In pursuance of fulfilling this goal, the engines have been simulated in AVL Boost™ platform which is one of the most accurate Virtual Engine Tools, to predict engine performance such as combustion optimization, emission and fuel consumption. To minimize the potential differences of friction losses, the bore and stroke per cylinder are taken as constant. The closed-cycle performance of the engine configurations is compared using a custom analysis tool that allows the sources of thermal efficiency differences to be identified and quantified. As a result, brake thermal efficiency, power and torque of OP2S engine have been improved compared to conventional engines while emission concern has been alleviated.
Źródło:
Combustion Engines; 2015, 54, 3; 78-84
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of diagnostic utility of instantaneous angular speed fluctuation of diesel engine crankshaft
Autorzy:
Dereszewski, M.
Charchalis, A.
Polanowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/244646.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
two-stroke diesel engine diagnostics
diagnostics of combustion process
angular speed variation
angular acceleration
moving approximation
Opis:
Frequent crew rotation, a shorthand, and various levels of technical crew skills, are the facts with the ship-owners has to cope very often. Having the proper level of engine exploitation as a main objective is necessary to implement a constant engine monitoring system, in order to obtain quick and reliable diagnostic information. One cannot omit the financial aspect of monitoring system implementation, created by its price and costs of service. In this paper, the analysis of diagnostic utility of the signal deriving from a propulsion shaft fluctuation during its one revolution is presented. The angular speed of the shaft was measured using a laser sensor of torque meter ETNP-10. Diagnostic utility validation has been verified on a basis of combustion quality, in cylinders of two-stroke, turbocharged Marine Diesel Engine. Test was carried out on board of a container vessel during its sea passage. In order to evaluate the effectiveness of the method, the crew simulated engine’s malfunction by fuel injection cut-off in various cylinders (only one in the same time).The interference signals decomposition was carried out using the method of synchronous averaging and moving approximation with polynomial of 3rd exponent.
Źródło:
Journal of KONES; 2011, 18, 1; 123-128
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of cooperation of a two-stroke combustion engine with an electric machine in the cogeneration system
Problematyka współpracy dwusuwowego silnika spalinowego z maszyną elektryczną w układzie kogeneracyjnym
Autorzy:
Marek, W.
Powiązania:
https://bibliotekanauki.pl/articles/263657.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
dwusuwowy silnik spalinowy
maszyna elektryczna
współpraca
wymiana ładunku
charge exchange
cooperation
electric machine
two-stroke combustion engine
Opis:
The paper presents the problem of charge formation process and charge exchange in a two-stroke SI engine. This problem is connected with the application of two-stroke engine with pneumatic fuel injection (according to the conception of Prof. St. Jarnuszkiewicz) in cogeneration systems. There are presented the results of simulating and laboratory investigation connected with the cooperation of combustion engine and electric machine. The machine was equipped with an electronic controller that enables electric machine protection against overload by load current limitation, charge current limitation, output voltage limitation to full battery charge voltage. Another controller tasks are: protection against battery - generator reverse current, generator protection against too high temperature, keeping required voltages, and currents apart from ambient temperature. The problems of process of fuel charge exchange was presented as the main question. It was considered from the one hand as an energetic demand of arrangement extorting, and from the other hand as obtainments of minimise exhaust gases toxic components amount.
Referat obejmuje zagadnienia kształtowania procesu wymiany ładunku w dwusuwowym silniku ZI. Problematykę tę powiązano z możliwością aplikacji silnika dwusuwowego z pneumatycznym wtryskiem paliwa (wg koncepcji prof. St. Jamuszkiewicza) w układach kogeneracyjnych. Zaprezentowano wyniki badań symulacyjnych i laboratoryjnych, związanych z zagadnieniem współpracy silnika spalinowego i maszyny elektrycznej, wyposażonej w elektroniczny regulator napięcia prądnicy, umożliwiający: zabezpieczenie maszyny przed przeciążeniem poprzez ograniczenie wartości prądu obciążenia, ograniczenie prądu do wartości maksymalnej prądu ładowania, ograniczenie napięcia wyjściowego do wartości napięcia końcowego naładowania baterii akumulatorów, zabezpieczenie przed przepływem prądu zwrotnego od baterii akumulatorów do prądnicy, ochronę prądnicy przed przekroczeniem temperatury dopuszczalnej, utrzymywanie zadanych wartości napięć i prądów niezależnie od temperatury otoczenia. Jako główne zagadnienie zaprezentowano problematykę procesu wymiany ładunku, w której uwzględniono z jednej strony energetyczne zapotrzebowanie układu wymuszającego, z drugiej zaś strony zapewnienie minimalizacji zawartości toksycznych składników w spalinach.
Źródło:
Archiwum Motoryzacji; 2008, 1; 79-90
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementing SimulationX in the modelling of marine shafting steady state torsional vibrations
Autorzy:
Vulić, Nenad
Bratić, Karlo
Lalić, Branko
Stazić, Ladislav
Powiązania:
https://bibliotekanauki.pl/articles/1573607.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
mechanical dynamic system
critical speeds
torsional stress amplitudes
two-stroke marine Diesel engine
normal firing
Opis:
Marine propulsion shafting systems are exposed to torsional vibrations originating from excitations in their prime movers and propellers. It is essential to analyse their steady state response in the earliest stage of ship design. The paper describes the implementation of SimulationX software based upon simulation modelling for these calculations. This software can be used either by the design office of the shipyard or by the classification society for verification within the plan approval phase. Some specifics of the input data preparation are briefly discussed. In addition, the simulation results depend on the modelling approach chosen. For these reasons, the real two-stroke Diesel engine ship propulsion system was chosen and several different models were implemented for system modelling. SimulationX calculation results are compared with those of two well-known and field-proven programs that use an analytical approach. Finally, the results are compared with the measurements performed on the actual newly built ship. Discussion reviews the selected SimulationX model, and its verification and validation in the case of engine cylinders with normal ignition.
Źródło:
Polish Maritime Research; 2021, 2; 63-71
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of the heat balance results of the selected Tier III-compliant gas-fuelled two-stroke main engines
Autorzy:
Korlak, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/24202453.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
heat balance
two-stroke engine
LNG
liquified natural gas
SCR
selective catalytic reduction
EGR
exhaust gas recirculation
bilans cieplny
silnik dwusuwowy
skroplony gaz ziemny
selektywna redukcja katalityczna
recyrkulacja spalin
Opis:
Two-stroke engines are distinguished by the highest overall efficiency among all main engines. This is not only due to the low speed, and large piston stroke, but also to the high combustion temperature, which results in an increase in nitrogen oxides (NOx) emission. Technical solutions applied to bring main engines into compliance with current NOx emission standards set by the Tier III limits include the use of SCR and EGR systems, the implementation of the Otto cycle, and the application of liquified natural gas (LNG) as the low-emission fuel. Impact of the available Tier III-compliant technologies on the heat balance results is analysed using the example of the currently most popular dual-fuel main engines, i.e. WinGD X92DF and MAN G95ME-C10.5-GI. The possibilities of waste heat recovery in the electricity generation process and thereby improving the ship energy efficiency are discussed.
Źródło:
Combustion Engines; 2023, 62, 2; 24--28
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
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