Autor: Kowalski, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The theoretical study on influence of fuel injection pressure on combustion parameters of the marine 4-stroke engine
Autorzy:: Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/243749.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine engine
multidimensional model
combustion model
fuel injection pressure
CFD
Opis:: The manuscript presents the analysis of influence of fuel injection pressure on the combustion parameters of marine 4-stroke diesel engine. Analysis is based on computational fluid dynamic (CFD) model designed on the basis of the motion mesh of combustion chamber of the marine engine cylinder and air inlet and exhaust gas ducts. Presented model consists of models of fuel injection into combustion chamber, breaking-up and evaporation of the fuel, mixing with air and turbulent combustion with heat transfer to construction elements of the engine cylinder. Mentioned CFD model is validated according to boundary and initial conditions taken from direct measurements. The chosen research object is laboratory 4-stroke turbocharged Diesel engine with direct injection of the fuel and mechanically controlled of both cylinder valves and the injector. During the calculation the fuel dose, delivered into the engine cylinder was changed without any other changes in the initial and boundary conditions. This approach to the problem allows to the cause-effect analysis. The results of presented study are as follows: The increase of the fuel injection pressure causes the increase of fuel dose, delivered into the engine cylinder and the increase of intensity of both kinetic and diffusion stage of the combustion process. The result of this is the increase of pressure and temperature of the combustion and significant increase of the NOx fraction despite the decrease of the O2 content in the combustion chamber of the engine.
Źródło:: Journal of KONES; 2016, 23, 1; 161-168
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of fuel injector holes diameter on parameters of combustion process in the cylinder of the marine 4-stroke Diesel engine
Autorzy:: Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2073635.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: marine engine
multidimensional model
combustion model
fuel injection
holes diameter
silnik okrętowy
model wielowymiarowy
model spalania
wtrysk
średnica otworu
Opis:: The paper presents an analysis of the influence of the fuel injector nozzle holes diameter on parameters of the brake-up, evaporation and combustion process in the cylinder of the marine 4-stroke Diesel engine. Presented analysis was prepared in the basis on computational fluid dynamic model. Initial and boundary conditions of the model as well as data used to model validation were collected during the laboratory study. Calculations were conducted for nominal fuel holes diameter equals 0.375mm and diameters increased and decreased by 50μm and 100μm respectively. According to presented results the increase of the diameter of fuel nozzle holes causes the increase of fuel Sauter’s mean diameter in the initial stage of the injection process and the decrease of fuel process evaporation. The result of this phenomenon is the slowdown of the initial stage of the combustion process and the decrease of both pressure and temperature of combustion.
Źródło:: Journal of Polish CIMEEAC; 2016, 11, 1; 95--102
1231-3998
Pojawia się w:: Journal of Polish CIMEEAC
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The theoretical investigation on influence the fuel spray geometry on the combustion and emission characteristic of the marine diesel engine
Autorzy:: Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/133037.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: marine engine
Computational Fluid Dynamics
CFD
combustion model
fuel injection
emission
silnik okrętowy
obliczeniowa mechanika płynów
model spalania
wtryskiwacz paliwa
emisja
Opis:: The paper presents an analysis of the influence of the fuel spray geometry on the combustion and emission characteristic of the marine 4-stroke Diesel engine. Presented analysis was prepared based on computational fluid dynamic model (CFD). Initial and boundary conditions of the model as well as data used to model validation were collected during the laboratory study. Calculations were conducted for two different fuel injectors with changed nozzle holes diameters, the number of nozzle holes and the angle between holes axis. The increase of the fuel nozzle holes diameter causes the decrease of the fuel spray tip penetration, but simultaneously the decrease of holes number causes that auto-ignition delay is not changed. The increase of the angle between holes axis from 150° to 158° causes fuel ingintion near cylinder head wall. Result of this is the increase of CO fraction. The deterioration of fuel combustion causes the decrease of NOx mass fraction in the cylinder also.
Źródło:: Combustion Engines; 2017, 56, 2; 101-107
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The emission and combustion characteristics of marine diesel engine with extreme throttled of air or exhaust ducts
Autorzy:: Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/27315962.pdf
Data publikacji:: 2018
Wydawca:: STE GROUP
Tematy:: silnik morski
dławienie
emisja
spalanie
usterka
marine engine
throttling
emission
combustion
malfunction
Opis:: Presented paper shows the results of the laboratory tests on the relationship between the extreme throttling of both air intake duct and exhaust gas duct and gaseous emission from the marine engine. The object of research is a laboratory, 4-stroke, DI diesel engine, operated at loads from 50 kW to 250 kW at a constant speed equal to 750 rpm. During the laboratory tests the thermodynamic and exhaust gas emission characteristics of the engine were measured with technical condition recognized as "working properly" and with simulated throttling of both air intake duct and exhaust gas duct. Air intake duct throttling by 60% causes visible changes at both gas temperature and pressure behind the intercooler. The study results show significant changes of NOx and CO2 emission for considered air intake duct throttling. The best indicator of exhaust gas duct throttling among considered thermodynamic parameters of the engine is mean in-cylinder pressure. In the case of measuring the composition of exhaust gas, the throttling of the exhaust gas duct causes visible changes in CO2 and NOx emission. The conclusion is that the results of measurements of the composition of the exhaust gas may contain valuable diagnostic information about the technical condition of air intake and exhaust gas duct of the marine engine.
Źródło:: New Trends in Production Engineering; 2018, 1, 1; 427-433
2545-2843
Pojawia się w:: New Trends in Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The detection of selected marine engine malfunctions on the basis of the exhaust gas composition
Wykrywanie wybranych niesprawności silnika okrętowego w oparciu o skład emitowanych spalin
Autorzy:: Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/327520.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: marine engine
malfunctions detection
exhaust gas composition
data classification
silnik okrętowy
wykrywanie niesprawności
skład spalin
klasyfikacja danych
Opis:: Marine diesel engines are generators of mechanical energy, but also are generators of toxic compounds into the atmosphere. The composition of the exhaust gas may be a carrier of diagnostic information about the condition of functional systems of the engine. Results of the classification and selection of diagnostic signals for selected marine engine malfunctions are presented. The analysis was based on results of laboratory tests. Mentioned classification was able to isolate symptoms of malfunctions of marine 4-stroke diesel engine in the composition of the exhaust gas. Complementary detection signals are exhaust gas temperature behind each cylinder. The conclusion of this work is the ability to detect by this method such engine malfunctions as the throttling the air intake duct, the throttling of the exhaust gas duct, the decreasing and the increasing of fuel injection pressure on the selected cylinder, chocked or discalibrated fuel injector, the leakage of the fuel pump, changing of the fuel injection timing and exhaust and inlet valves malfunctions.
Silniki tłokowe generatorami energii mechanicznej, ale również generatorami emisji związków toksycznych do atmosfery. Skład emitowanych spalin może być nośnikiem informacji diagnostycznej o stanie technicznym układów funkcjonalnych silnika. W pracy przedstawiono wyniki klasyfikacji i wyboru sygnałów diagnostycznych dla wybranych niesprawności silnika okrętowego. Analiza została oparta na wynikach badań laboratoryjnych. W wyniku przeprowadzonych działań udało się wyodrębnić symptomy niesprawności 4-suwowego silnika okrętowego w składzie emitowanych spalin. Sygnałami uzupełniającymi detekcję są temperatury gazów spalinowych za poszczególnymi cylindrami. Wnioskiem z prezentowanej pracy jest możliwość wykrycia tą metodą takich niesprawności silnika jak dławienie kanału dolotowego powietrza i wylotowego spalin, obniżenie i zwiększenie ciśnienia wtrysku paliwa do wybranego cylindra, zakoksowanie lub rozkalibrowanie wtryskiwacza, przecieki w pompie paliwowej, zmiana rozpoczęcia wtrysku paliwa oraz wypalenie gniazd zaworów dolotowych i wylotowych.
Źródło:: Diagnostyka; 2014, 15, 3; 39-44
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: An artifical neural network usage in measurement of exhaust gas emission from marine engines: case study
Autorzy:: Kowalski, J.
Rudzki, K.
Powiązania:: https://bibliotekanauki.pl/articles/2073611.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: marine engine
emission
neural network
measurement
power approximation
silnik okrętowy
emisja
sieć neuronowa
pomiar
Opis:: The paper presents the case study of use the artificial neural network to predict the main propulsion marine engine load. Mentioned load of the engine is important parameter to assess the emission level of toxic compounds into the atmosphere according to ISO standard and MARPOL convention. The engine load depends on the ship speed, rotational speed of the engine, propeller blades settings, the direction and the speed of wind, the condition of sea and the direction and the speed of sea currents and construction parameters of the ship. The realization of the aim of the work requires the direct measurement of presented parameters and measurement of exhaust gas composition. The experiment was carried out onboard STS “Pogoria”. Obtained results are enough to use the ANN to predict engine load to measure the emission level of toxic compounds.
Źródło:: Journal of Polish CIMEEAC; 2016, 11, 1; 87--93
1231-3998
Pojawia się w:: Journal of Polish CIMEEAC
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Influence of the marine 4 - stroke diesel engine malfunctions on the nitric oxides emission
Autorzy:: Lewińska, J.
Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/247875.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: emission
malfunction
piston engine
marine engine
nitric oxides
Opis:: The article presents the results of the laboratory study on nitric oxides (NOx) emission level from marine fourstroke diesel engine. The object of the study was laboratory piston engine, operating at constant speed. Measured engine parameters were necessary to determine the NOx emission in accordance of the requirements of the Annex VI to MARPOL 73/78 Convention. The study consisted of tests during the engine operation without malfunctions and engine operation with simulated malfunctions. Malfunctions of the charge gas exchange in the form of throttling of the air intake duct and the throttling of the exhaust gas duct were taken into account in the simulations. Measurements during the engine operation with simulated malfunctions of the fuel pump on one of the cylinders were also carried out. Mentioned malfunctions were delay of the fuel injection by 5° of the crankshaft angle position and the leakage of the fuel pump of the second engine cylinder. The simulated malfunctions decrease the total weighted NOx emission in all considered the engine loads. All simulated malfunctions resulted in an increase of the NOx emissions during engine operation at low the engine loads and a decrease of the mentioned emission at maximum the engine loads operation. The calculations of the weighted specific fuel consumption present a little change in engine efficiency which are within the range of measuring error of the used method.
Źródło:: Journal of KONES; 2013, 20, 1; 171-177
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Experimental research on influence of the fuel nozzle geometry on the fuel consumption of the marine 4-stroke diesel engine
Autorzy:: Kowalski, J.
Nagórski, J.
Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/245963.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine engine
fuel consumption
fuel injection
experimental measurements
compression ignition engine
Opis:: The article presents experimental research that has been carried out on a marine, 4-stroke, 3-cylinder, turbocharged engine. During testing, the engine operated at a constant rotational speed of 750 rpm and a load from 0 kW to 280 kW. The engine was fuelled by diesel oil of known specification and loaded by electric generator with water resistance. The fuel consumption was measured during the engine operation with fuel nozzles with different geometries. The measurement of the fuel consumption was carried out using a weighing system that was designed, constructed, and manufactured by the “KAIZEN” scientific research team at the Faculty of Mechanical Engineering at the Gdynia Maritime University. The results of measurements show changes in the fuel consumption by the engine with the geometry of the injected fuel spray. The research facility is Sulzer’s 3- cylinder, 4-stroke, turbocharged AL25/30 piston engine. The fuel system consists of Bosch injection pumps controlled by a rotation speed regulator. Fuel injectors are centrally located in the cylinder heads of the engine.
Źródło:: Journal of KONES; 2018, 25, 2; 185-190
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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