Temat: piston IC engine - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Changes in the tightness of the combustion chamber of an diesel engine during long-term operation
Autorzy:: Koszałka, G.
Powiązania:: https://bibliotekanauki.pl/articles/244031.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IC engine
blowby
compression pressure
leak-down test
piston ring
cylinder
wear
Opis:: The paper presents results of research on changes in the tightness of the combustion chamber during long-term operation. The study was conducted on 5 six-cylinder diesel engines with a swept volume of 6.8 dm mounted in medium size trucks. All 5 trucks were used and serviced in similar conditions. The changes in the tightness o f the combustion chamber were determined on the basis of the results of periodical measurements of maximum compression pressure in cylinders, drop of pressure during a cylinder leakage test and blowby rate under different conditions of engine operation. The investigation was carried out in the range of vehicle mileage of 0-450,000 km. The results show ed that in the initial period of engine use (0-40,000 km) the tightness of the combustion chamber improved, after which it gradually deteriorated. For mileages of over 40,000 km, the significance of linear correlations between results of all tightness measurements and mileage were conflrmed and regression lines were determined. Mean rates of changes in the individual tightness parameters differed considerably among one another. Mazimum compression pressure changed the slowest and blowby the fastest together with mileage. Mean value of maximum compression pressure at 440,000 km was only 13% lower than at 40,000 km, whereas blowby rate at full engine loadat 2200 rpm was 125% higher.
Źródło:: Journal of KONES; 2010, 17, 3; 215-222
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 engine load on piston ring pack operation of an automotive IC engine
Autorzy:: Wolff, Andrzej
Koszałka, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/2097662.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: automotive IC engine
piston rings
blowby
ring dynamics
hydrodynamic lubrication
mixed friction
silnik o spalaniu wewnętrznym
pierścienie tłokowe
przedmuchy spalin
dynamika pierścienia
smarowanie hydrodynamiczne
tarcie mieszane
Opis:: A piston-rings-cylinder (PRC) assembly determines the blowby, engine oil consumption, and friction and wear processes accompanying the system's operation. Thus, it is crucial for the whole IC engine efficiency and lifetime. A lot of research effort is put into increasing the performance of this complex and highly dynamic system. Advanced, comprehensive models play an important role in understanding and improving the PRC system. In the presented work, the effect of load on the operation of the ring pack of an automotive gasoline engine is analyzed. A comprehensive model that covers the gas flow through the crevices of the PRC system, ring displacements in the groove, and ring lubrication was used for this analysis. The results of the simulations show that the local thickness of the oil film, especially near the piston top dead center is compared to the height of the combined surface roughness of a cylinder liner and piston rings, and friction-related asperity contact strongly increases as the engine load increases. The simulations also show that the engine load affects the axial displacements of the rings in the grooves but practically does not affect the thickness of the oil film left by the ring pack on the cylinder liner.
Źródło:: Combustion Engines; 2022, 61, 3; 88--94
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical thermo-mechanical strength analysis of an IC engine component
Autorzy:: Ali, M. A. N.
Hussein, R. A.
Hussein, H. A.
Powiązania:: https://bibliotekanauki.pl/articles/2106442.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: analiza numeryczna
silnik spalinowy
naprężenie
trwałość zmęczeniowa
numerical analysis
IC engine piston
geometrical shape
thermo-mechanical strength
stress intensity
fatigue life
Opis:: This research investigates a thermo-mechanical strength of three geometrical shape designs of an internal combustion (IC) engine piston by a finite element analysis (FEA). FEA was performed using Solidworks software for modelling geometrical piston designs, and the models were imported into ANSYS software for thermo-mechanical fatigue simulation. The work focused on predicting high stress intensity and indicated the fatigue critical regions and life of the piston shape design. AL7075-T6 aluminium alloy was used as a piston material and thermo-mechanical fatigue simulation was conducted based on the experimental stress-number of cycles recorded data from literature. Analytical results showed the similarity of the critical failure positions to some real failures in the IC engine piston, and the shape design modification of the piston. Hence, this concept can be used to satisfy the IC engine design needs at low cost.
Źródło:: International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 1--11
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Porównawcze cykle pracy silnika z wieloetapowym wtryskiem paliwa
Comparative working cycles of multi-point fuel injection engine
Autorzy:: Ambrozik, A.
Ambrozik, T.
Kurczyński, D.
Łagowski, P.
Suchecki, A.
Powiązania:: https://bibliotekanauki.pl/articles/395679.pdf
Data publikacji:: 2012
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: tłokowy silnik spalinowy
cykle pracy
wykres indykatorowy
wykres porównawczy
piston IC engine
working cycles
indicator diagram
comparative diagram
Opis:: W artykule przedstawiono porównawcze cykle pracy silnika 1.3 Multijet, który wyposażony jest w wtryskowy układ zasilania common rail umożliwiający podział dawki paliwa na 3 części i ich wtrysk do cylindra pod maksymalnym ciśnieniem 160 MPa. Ponadto w artykule przedstawiono równania umożliwiające obliczenie parametrów termodynamicznych w charakterystycznych punktach cyklu porównawczego jak również przedstawiono zależności na wyznaczanie podstawowych wskaźników porównawczego cyklu pracy jak: średnie ciśnienie procesu napełniania i wylotu spalin, wykładników politropy sprężania i rozprężania jak również zależności na podstawowe wskaźniki porównawczego cyklu pracy. Rozpatrywane w artykule porównawcze, silnikowe cykle pracy Sabathe`a, przedstawiono we współrzędnych p-V, w które wpisane są rzeczywiste wykresy indykatorowe sporządzone przy pracy silnika wg zewnętrznej charakterystyki prędkościowej, w zakresie prędkości obrotowej wału korbowego silnika od 1000 do 4600 obr/min.
The paper presents comparative working cycles of 1.3 Multijet engine equipped with the common rail injection system, which makes it possible to divide the fuel charge into three portions and to inject it into the cylinder at the maximum pressure of 160 MPa. The equations for computing thermodynamic parameters at the characteristic points of the comparative cycle are also provided in the paper. The dependencies for determining the basic indicators of the comparative working cycle are given. They include the following: the mean filling pressure and the mean pressure of the exhaust gas outflow, and the indexes of the polytropic compression and expansion. The paper also presents the dependencies for the basic indicators of the comparative working cycle. The comparative Sabathe cycles of the engine work discussed in the paper are presented in the form of p-V diagram, into which real indicator diagrams were included. The latter were taken when the engine operated in accordance with the external speed characteristics at the engine crankshaft rotational speed ranging from 1000 to 4600 rpm.
Źródło:: Postępy Nauki i Techniki; 2012, 14; 18-30
2080-4075
Pojawia się w:: Postępy Nauki i Techniki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Variability of the resistance to motion at engine crank-piston set
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/242766.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IC engine
piston-cylinder assembly
friction
friction losses
Opis:: The resistance to motion that accompany the combustion engine run affects its technical and economical indices. Appropriate modifications in design of constitutive parts as well as proper selection of kinematic pairs' collaboration data might lead to the minimization of resistance, above all the frictional one. In order to estimate precisely this resistance as well as the area and reasons of their generation certain measurement methods are implemented that facilitate size of resistance and changes occurring within a single cycle. Beside methods requiring interference into engine's construction other methods are used, among other the motoring method. Despite the advantages like simplicity, there are also problems with the use of this method. The most important are: different measuring conditions (no fires) and measurement of the resistance average value. In a course of described simulations evaluation of mutual relations between friction forces and torques relative to different sources have been carried out, in particular those relating to the crank - piston assembly. A trial to give the answer if it is possible to distinguish the effect of individual resistances at certain engine subassemblies in the total resistance torque was the main effect of presented analysis. Exemplary calculations have been carried out for the 170A.000 type engine.
Źródło:: Journal of KONES; 2007, 14, 4; 416-425
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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