Optimization of combustion characteristics and fuel injection timing of a new type dual-pit combustor rotary engine

Abstract

In order to improve the performance of the rotary engine, this paper has designed a new type of dual-pit rotary engine combustion chamber structure, and compares the combustion and emission characteristics with the rotary engine with a traditional combustion chamber. The existence of the dual-pit combustion chamber strengthens the overall vortex intensity in the cylinder, effectively promotes the mixing process of fuel and air in the cylinder, the maximum combustion pressure in the cylinder increased by 8.6%, significantly increases the diffusion combustion speed, and significantly improves the dynamic performance of the rotary engine. On this basis, the effects of fuel injection timing parameters on fuel distribution, combustion and emission characteristics were studied. Fuel distribution is more even and dispersed during injection in the later stage of compression. When the fuel injection timing was 105°BTDC in the middle of the compression phase, the matching effect of fuel distribution law and ignition scheme was the best. When the injection timing was 75°BTDC and 85°BTDC in the late compression stage, the mass fraction of NOx remained at a low level. The correlation between soot generation and the change of fuel injection timing was weak. When the injection time was 85°BTDC, the soot generation remained at a relatively high level. © 2021, Tech Science Press. All rights reserved.