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Tytuł:
Various designs of the two-stroke engine heads with the valve flushed system
Autorzy:
Łoza, Ł.
Kaźmierczak, A.
Borkowska, J.
Skorupa, P.
Krakowian, K.
Cienciała, M.
Powiązania:
https://bibliotekanauki.pl/articles/242546.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine
two-stroke
internal combustion
valve flushed system
piston-controlled cam
high petrol consumption
oil in the petrol
toxic by-products
loud noise
uneven running
low efficiency
Opis:
The two-stroke engines have never acquired the popularity of the four-stroke engines due to their inherent performance limitations. The tasks of many engineering teams were to find the basic causes, which resulted in the inferior performance of these engines. Today’s task is to build a two-stroke engine whose performance could match that of a four-stroke engine in areas of common use. The most typical performance problems of a two-stroke engine are high petrol consumption caused by low efficiency, toxic by-products of combustion being emitted into the atmosphere (caused by oil present in the petrol), and uneven and loud engine noise. The greatest challenge is to achieve a good chamber purge during one stroke in which the fresh fuel mixture flows through the piston-controlled inlet port while at the same time the fumes are being exhausted through the outlet port. This in contrast with the four-stroke engines where the intake and exhaust are each done with two separate strokes. From the energy point of view, the two-stroke engine is not efficient because a certain amount of fresh fuel is being wasted in the exhaust fumes. We propose to replace the piston-controlled cam with the valve-flushed system, which will cause the combustion process to become more efficient. The purpose of this paper is to present various designs of the engine heads and analyse their performance. The goal of this proposal is to choose the best combination of these engine heads in order to achieve the optimum overall engine performance.
Źródło:
Journal of KONES; 2015, 22, 4; 187-190
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilizacija tepla dvigatelejj mobilnykh ehnergeticheskikh sredstv
Heat recovery for engines of agricultural machinery
Autorzy:
Havrysh, V.
Shatohin, M.
Gruban, V.
Powiązania:
https://bibliotekanauki.pl/articles/78269.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
agricultural machine
combine-harvester
tractor
heat recovery system
combustion engine
modernization
efficiency
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 2
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Water Injection Technique to Improve the Combustion Efficiency of the Spark-Ignition Engine: A Model Study
Autorzy:
Ghazal, Osama H.
Borowski, Gabriel
Powiązania:
https://bibliotekanauki.pl/articles/125381.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water injection
combustion
emissions
engine modeling
Opis:
In the paper, the effect of water injection and different air/fuel ratio on the gasoline engine performance and emissions was investigated theoretically. A four cylinder SI engine model was built using GT-Power professional software. The gasoline fuel was injected directly to the cylinder and water was injected into the intake manifold with different mass flow rate. The calculated engine parameters were: cylinder pressure and temperature, brake torque, brake power, mean effective pressure, thermal efficiency, carbon monoxide, hydrocarbon, and nitrogen oxide emissions. The results of simulations show that the increased water mass flow rate resulted in an improved engine performance and decreased emissions compared to neat gasoline fuel. However, we found that the excessive increase of the water amount inside the cylinder resulted in a deteriorated engine performance and, consequently, poor combustion efficiency.
Źródło:
Journal of Ecological Engineering; 2019, 20, 2; 226-233
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Total efficiency of adjustable compression ratio SI engine
Autorzy:
Sendyka, B.
Kula, K.
Kudzia, S.
Soczowka, J.
Powiązania:
https://bibliotekanauki.pl/articles/242772.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
SI engine
compression ratio
combustion engines
total efficiency
Opis:
The following paper includes adjustable ratio spark ignition engine's total efficiency analysis. Main modification of the engine is mounting of crankshaft on eccentric mechanism. Paper presents schemes of eccentric mechanism implemented in developed engine as well as adjustable compression ratio control system's block diagram. Propulsion from stepper motor is transmitted through self-locking worm gear. Value of compression ratio varies from 9.5 to 14. The main input signal for electronic control system is coming from knock-sensor mounted on the engine. If control system doesn't receive that signal it levels up compression ratio. As soon as signal appears ratio mentioned above is reduced by a value 0.05. During the investigation rotational speed of the engine was limited to nterval 1800-4000 [rpm] and throttle was partially closed. Relative increase of Suzuki engine's total efficiency presented in this paper surpasses 30 per cent. The outcome of investigation presents engine with variable compression ratio as a good prospect for the future. Constant adjustment of compression ratio with use of electronical control system allows significant improvement of total efficiency and consequently reducing fuel consumption.
Źródło:
Journal of KONES; 2007, 14, 4; 401-407
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of temperature and the ratio of air excess on combustion efficiency of polyolefin materials
Wpływ temperatury i stosunku nadmiaru powietrza na efektywność spalania materiałów poliolefinowych
Autorzy:
Kuźnia, M.
Powiązania:
https://bibliotekanauki.pl/articles/263769.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
spalanie
odpady poliolefinowe
zanieczyszczenia
combustion
polyolefin wastes
pollutants
Opis:
Combustion of plastics is a very complex process and phenomena, which occur during this process, have not been sufficiently investigated. Polyolefins constitute almost half of all the generated plastics. In this study, the influence of temperature and the ratio of air excess on the concentration of pollutants in flue gases have been presented. The studies carried out on the designed test bench were preceded by a series of thermal analyses (TG, DSC, TG-MS).
Spalanie tworzyw sztucznych jest procesem bardzo złożonym, a zachodzące w nim zjawiska nie są dostatecznie zbadane. Blisko połowę wszystkich generowanych tworzyw sztucznych stanowią poliolefiny. W niniejszej pracy przedstawiono wpływ temperatury i stosunku nadmiaru powietrza na stężenia zanieczyszczeń w gazach odlotowych. Badania na zaprojektowanym stanowisku badawczym poprzedzono szeregiem badań z zakresu analizy termicznej (TG, DSC, TG-MS).
Źródło:
Metallurgy and Foundry Engineering; 2010, 36, 1; 57-66
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of diesel oil improvers on indices of atomisation and combustion in high-efficiency engines
Autorzy:
Pielecha, I.
Pielecha, J.
Skowron, M.
Mazanek, A.
Powiązania:
https://bibliotekanauki.pl/articles/259914.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
diesel oil
diesel engine
improvers
fuel injection
fuel combustion
Opis:
The process of fuel combustion in a diesel engine is determined by factors existing during liquid fuel injection and atomisation. The physicochemical properties of the fuel to a large extent decide upon the quality of this phase of cylinder fuelling. So it is important to ensure appropriate properties of a fuel affecting its atomisation and, as a result, combustion. The paper deals with the topic of diesel oil improvers and the analysis of their influence on atomisation and combustion indices. In the studies base diesel oil and a diesel fuel improved by a package of additives, were used. The process of conventional and improved fuel injection was analysed by using optical examinations. The amount of released heat was evaluated during the studies carried out on combustion. Significant aspects of the applied improvers in relation to fuel injection and its combustion have been indicated.
Źródło:
Polish Maritime Research; 2017, 3; 99-105
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The improvement of environmental characteristics of the combined cycle power plant by the implementation of the carbon capture installation
Autorzy:
Kotowicz, J.
Brzęczek, M.
Job, M.
Powiązania:
https://bibliotekanauki.pl/articles/134906.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
combined cycle power plant
post-combustion technology
chemical absorption
carbon capture installation
power plant efficiency
ecological characteristics
Opis:
The paper describes a combined cycle power plant with carbon capture installation in a post-combustion technology. Carbon dioxide is separated from flue gas by using a chemical absorption method with monoethanolamine (MEA) as a sorbent. Separated carbon dioxide is compressed in order to prepare for transportation to the storage place. This paper identifies the electric efficiencies and other characteristic parameters of power plants before and after implementation of CO2 capture installation, as well as the power plant efficiency drop, and the improvement of ecological characteristics related to the implementation of this installation. The implementation of the installation described herein is associated with the efficiency loss caused by the auxiliary power for additional installations. The CO2 separation installation is powered by heat energy required for reclaiming the sorbent. This energy is taken in the form of steam extracted from the steam cycle, thus reducing the steam turbine power output, while the CO2 compression installation is powered by electric energy.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 19-24
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The hybrid concept of turboshaft engine working according to Humphrey cycle dedicated to variety power demand - CFD analysis
Autorzy:
Tarnawski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/24202460.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
pressure gain combustion
Humphrey cycle
turbine engine
CFD analysis
valve timing system
isochoric combustion
engine energy efficiency
sealing system
spalanie powodujące wzrost ciśnienia
cykl Humphreya
silnik turbinowy
analiza CFD
układ rozrządu
spalanie izochoryczne
sprawność energetyczna silnika
system uszczelniający
Opis:
The paper presents a new concept of the turbine engine in the area of pressure gain combustion (PGE). The engine works according to Humphrey’s cycle. Minor modification in construction has allowed power generation of 500 kW, 700 kW, 1000 kW, and 1800 kW. The concept successfully resolved the challenges related to the temporary opening and closing of the combustion chamber. The presented valve timing system has ensured effective gas flow and what stands behind it, an effective process of conversion of a high-pressure gas impulse into mechanical energy. Rotating combustion chambers enabled the application of an effective sealing system. The concept characterizes simple construction and potentially low power-to-weight coefficient. The CFD numerical analysis of the presented engine concept showed very promising effective efficiency and low specific fuel consumption.
Źródło:
Combustion Engines; 2023, 62, 2; 129--136
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The experimental assessment of air supply system modification on inlet air filtration efficiency and military vehicle engine effectiveness improvement
Autorzy:
Dziubak, T.
Trawiński, G.
Powiązania:
https://bibliotekanauki.pl/articles/243953.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
air filters
filtration efficiency
flow drag
filter absorbency
effective parameters of the engine
mechanical efficiency
Opis:
Specific features of air inlet system of BWP-1 vehicle UTD-20 engine are shown. The tests results of filtration efficiency and air flow drag for BWP-1 vehicle air filter standard version are presented. The necessity of UTD-20 engine air supplying system constructional changes are proved. The inlet air filtration system for BWP-1 engine with the porous filter was proposed and performed. The characteristics of the air purification efficiency (fi=f(mp) and flow drag Delta p- f(mp) Delta p= f(Omega c) for designed air filter were determined. Absorbency of filter for air nominal stream of engine BWP-1 was specified. The designed and executed partition air filter was subjected to comparative tests on an engine test bench. The influence of modernized air filter and fuel dose increase on engine effective parameters were determined. The tests covered comparison of effective parameters (determined for maximum load) of a UTD-20 engine equipped with a standard air filter (variant 1), a modernized air filter (variant 2) and additionally, for the modernized air filter, with injection pump with fuel dose increased (variant 3). There were determined the influence the proposed changes on indicated and effective torque during engine free acceleration and its mechanical efficiency as well.
Źródło:
Journal of KONES; 2010, 17, 3; 79-86
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the regularity of the combustion process in the SI engine fueled with petrol and ethanol
Autorzy:
Stelmasiak, Z.
Pietras, D.
Powiązania:
https://bibliotekanauki.pl/articles/133367.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
ethyl alcohol
overall efficiency
engine smoothness
combustion pressure
indicated pressure
alkohol etylowy
sprawność ogólna
równomierna praca silnika
ciśnienie spalania
ciśnienie indykowane
Opis:
In the paper are presented results of a research work concerning automotive spark ignition engine fueled with ethyl alcohol. The research was performed on a Fiat 1100 MPI engine adapted to dual fuel feeding. Injection of ethyl alcohol was accomplished in area near inlet valve with use of original injectors, the same as used in case of gasoline feeding. The subject-matter of the study was to compare smoothness of engine operation fueled with alcohol in relation to parameters of the engine fueled traditionally with gasoline. There were analyzed combustion parameters calculated on the basis of recorded indicated diagrams of successive individual combustion cycles and averaged diagrams of successive 50 cycles. Performed investigations are pointing at smooth engine operation running on neat alcohol, and on improvement of performance parameters such as effective power and overall efficiency.
Źródło:
Combustion Engines; 2017, 56, 1; 94-99
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The energy efficiency and ecological benefits of low-power furnaces powered by secondary biofuel
Efektywność energetyczna i ekologiczna kotła małej mocy zasilanego biokomponentowym paliwem wtórnym
Autorzy:
Swat, M.
Powiązania:
https://bibliotekanauki.pl/articles/256815.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
combustion
liquid fuel furnace
alternative fuel
FAME
power efficiency
ecological efficiency
spalanie
kocioł na paliwo płynne
paliwo alternatywne
sprawność energetyczna
sprawność ekologiczna
Opis:
The application of FAME obtained from was te vegetable oil has become a very attractive fuel, because, apart from being an energy carrier, it is also a solution for burdensome waste. Based on conducted research, the author presents the influence of FAME on the basie operational parameters of a low-power furnace. The following parameters were analysed: the air excess factor, the temperature of exhaust gases, and the concentration of toxic compounds in exhausts during the combustion process. The thermal energy was measured both for FAME and for its mixtures with heating oil. The appropriately applied combustion conditions as well as suitable composition of the fuel provide an ecological and effective supply for commercial low-power furnaces.
Zastosowanie FAME pochodzącej z odpadowych olejów roślinnych jako paliwa nabiera coraz większego znaczenia, ponieważ oprócz tego, że może być źródłem energii - rozwiązuje również problem utylizacji uciążliwych dla środowiska odpadów. Na podstawie przeprowadzonych badań określono wpływ FAME na przebieg podstawowych parametrów procesu spalania w urządzeniu kotłowym małej mocy. Określono zmiany współczynnika nadmiaru powietrza, zmiany temperatur gazów spalinowych, zmiany stężeń toksycznych składników spalin w trakcie procesów spalania. Ustalono ilości energii cieplnej wytworzonej w instalacji kotłowej w trakcie spalania FAME i jego mieszanin paliwowych z olejem opałowym. Kontrolowane zmiany parametrów procesowych warunków spalania FAME i wybranych mieszanin z olejem opałowym pozwalają na ekologiczne prowadzenie procesów spalania w komercyjnych kotłach małej mocy.
Źródło:
Problemy Eksploatacji; 2016, 4; 127-139
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The efficiency analysis of an asynchronous generator supplying single-phase receiver sets in an agricultural farm
Analiza efektywnosci generatora asynchronicznego zasilajacego odbiorniki jednofazowe w gospodarstwie rolnym
Autorzy:
Makarski, P.
Scibisz, M.
Powiązania:
https://bibliotekanauki.pl/articles/792405.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
asynchronous generator
generator efficiency
single-phase receiver
agricultural farm
electrical energy
combustion engine
energy network
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of blending dimethyl ether with LPG on the engine operation and its efficiency
Wpływ udziału DME na przebieg spalania mieszaniny DME-LPG w silniku ZI
Autorzy:
Flekiewicz, M.
Kubica, G.
Powiązania:
https://bibliotekanauki.pl/articles/133706.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
alternative fuels
DME
LPG
fuel blend
SI engine
combustion
paliwa alternatywne
mieszanina paliw
silnik ZI
spalanie
Opis:
The paper presents a continuation of a research program related to the activators for gaseous fuels used in modern vehicles. Selected vehicle dynamic parameters obtained by the application of a mixture of LPG and DME for the mass share of 0 to 26 % have been presented. The object of the research was a 1.6 SI engine adapted to a combustion of gaseous fuels. The authors present the results of the energy conversion efficiency in a four cylinder SI 1.6 cm3 engine.
Artykuł prezentuje wybrane wyniki badań nad aktywatorami spalania alternatywnych paliw gazowych, wykorzystywanych do napędu pojazdów samochodowych. Określono wpływ udziału DME w mieszaninie DME-LPG na sprawność przetwarzania energii w silniku ZI. Obiektem badań był czterocylindrowy silnik napędzający samochód Opel Astra, wyposażony w dodatkowy układ zasilania, typu PFI. W badaniach wykorzystano mieszaniny DME-LPG o udziale masowym DME od 0 do 26 %. Dla każdej z mieszanin zrealizowano kilka serii pomiarowych, w ustalonych warunkach pracy silnika. Wyjaśniono wpływ udziału DME w mieszaninie na osiągi silnika, a także podstawowe parametry charakteryzujące proces spalania. Stwierdzono, że masowy udział DME nieprzekraczający 11 % wpływa na zwiększenie sprawności przetworzenia energii, przyrost ciśnienia, stopień wypalenia ładunku i ilość wydzielanego ciepła.
Źródło:
Combustion Engines; 2013, 52, 3; 86-95
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of oxygenated diesel-n-butanol fuel blends on combustion, performance, and exhaust emissions of a turbocharged crdi diesel engine
Autorzy:
Labeckas, G.
Slavinskas, S.
Rudnicki, J.
Zadrąg, R.
Powiązania:
https://bibliotekanauki.pl/articles/259929.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
diesel engine
diesel-n-butanol blends
combustion phenomenon
performance efficiency
smoke
pollutant emissions
Opis:
The article deals with the effects made by using various n-butanol-diesel fuel blends on the combustion history, engine performance and exhaust emissions of a turbocharged four-stroke, four-cylinder, CRDI 1154HP (85 kW) diesel engine. At first, load characteristics were taken when running an engine with normal diesel fuel (DF) to have ‘baseline’ parameters at the two ranges of speed of 1800 and 2500 rpm. Four a fossil diesel (class 1) and normal butanol (n-butanol) fuel blends possessing 1 wt%, 2 wt%, 3 wt%, and 4 wt% (by mass) of n-butanol-bound oxygen fractions were prepared by pouring 4.65 wt% (BD1), 9.30 wt% (BD2), 13.95 wt% (BD3), and 18.65 wt% (BD4) n-butanol to diesel fuel. Then, load characteristics were taken when an engine with n-butanol-oxygenated fuel blends at the same speeds. Analysis of the changes occurred in the autoignition delay, combustion history, the cycle-to-cycle variation, engine efficiency, smoke, and exhaust emissions NOx, CO, THC obtained with purposely designed fuel blends was performed on comparative bases with the corresponding values measured with ‘baseline’ diesel fuel to reveal the potential developing trends.
Źródło:
Polish Maritime Research; 2018, 1; 108-120
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The description of the total efficiency of 2SZ-FE engine with the variable valve timing
Autorzy:
Sendyka, B.
Sochan, A.
Noga, M.
Rodak, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/243046.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
silnik spalinowy
obieg Atkinsona
spalanie
sprawność ogólna
silnik
combustion engine
Atkinson cycle
combustion
total efficiency
engine
Opis:
In this paper there were conducted tests of the combustion engine with the Atkinson cycle and with applying variable valve timing. There was described the 2SZ-FE engine characteristics and assigned the total efficiency before and after application of the phase shifter. Secondly, there was determined the thermal efficiency of the single engine work cycles and also engine 's total efficiency by using the optoelectronic pressure sensor and mathematical programme. After that, it was available to present the range of the variable valve timing. Atkinson system, phases of 2SZ-FE engine timing gear, the total efficiency distribution during 75 % of throttle opening and when inlet valves are open, the total efficiency increase during 75 % of throttle opening, the total efficiency distribution during 50 % of throttle opening and when suction valves are open, the total efficiency increase during 50 % of throttle opening, the total efficiency distribution during 25 % of throttle opening and when inlet valves are opened, the total efficiency increase during 25 % of throttle opening, the total efficiency distribution with application of phases shifter are presented in the paper.
Źródło:
Journal of KONES; 2007, 14, 2; 401-407
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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