Optimization of the combustion chamber in a 2-stroke barrel engine and comparison with 4-stroke classical crankshaft mechanism engine

• Autorzy: Mazuro P , Jaworski P , Teodorczyk A
• Konferencja: Międzynarodowy Kongres Silników Spalinowych (3 ; 22-24.06.2009 ; Opole, Polska)
• Języki publikacji: EN

Abstrakty

EN

In the paper, the results of numerical optimization of the combustion chamber of a 2-stroke CI barrel engine are presented and the comparison to a 4-stroke engine with traditional crankshaft mechanism is performed. The optimization is made on the basis of CFD simulations performed for different geometrical models of the combustion chamber, specially designed for the barrel engine. The initial conditions for simulations were assumed taking into account the differences in mixture exchange in the chamber after combustion process for different rotational speeds, density, pressure and wall temperature. The simulations were made for various fuel - gasoline (approximated by C8H17) and diesel (simulated by C13H23) with the use of AVL FIRE software. The target was to create a proper chamber for CI and HCCI mode of combustion system. The results indicated that combustion chambers which were acceptable for CI mode are not appropriate for HCCI mode of engine operation. This comes from the characteristics of chemical reactions and fuel injection. The standard injectors on the market for CI and SI engines have different characteristics of injection, fuel brake up, fuel evaporation and mixing with air. It was found that the well operating combustion chamber with one fuel (for example H8C17), in HCCI mode, is not working well for other fuel, like C13H23. These observations must be confirmed during engine bench tests which are planned for near future. The comparison of a 2-stroke barrel engine with the 4-stroke engine with traditional crankshaft mechanism is based on literature data and shows that properly designed combustion process in the barrel engine with its advantages in construction can give much better results than the engine with traditional crankshaft mechanism. The major advantages are: smaller friction losses, smaller fuel consumption, higher engine efficiency, higher power/weight ratio.

Słowa kluczowe

EN

barrel engine; CFD; simulation; combustion chamber; optimization; HCCI

PL

symulacja; komora spalania; optymalizacja

• Wydawca: Polskie Towarzystwo Naukowe Silników Spalinowych
• Czasopismo: Silniki Spalinowe
• Rocznik: 2009
• Tom: R. 48, SC1
• Strony: 254--265
• Opis fizyczny: Bibliogr. 1 poz., il., tab., wykr.

Twórcy

autor

Mazuro P

autor

Jaworski P

autor

Teodorczyk A

Bibliografia

• [1] Mazuro P., Rychter T., Teodorczyk A.: Internal Combustion Engines with Cylinder Axes Paralel to Driver Shaft Axis versus Conventional Crank Shaft Engines – Comparison of Mechanical efficiency and Losses, International Congress on Combustion Engines 2007, Kraków.