Thermodynamic Simulation Analysis And Test Of YC4S Diesel Engine

With the rapid development of diesel engine industry, nowadays, the traditional development process is no longer able to meet the needs for modern diesel engine development as well as for the market upgrade due to the lack of complex and scientific theoretical calculation, high reject rate, high test cost and long development cycle. Therefore, it is particularly important to adopt the modern CAE simulation technology to predict the performance of the engine at the stage of engine drawing design and reduce the engine test schemes at the test stage through the optimization of the scheme. This article, with the YC4 S diesel engine which has been developed by Yuchai as the research target, has predicated the power and cost effectiveness of the engine at the stage of the engine. The main points of this paper include :(1) It summarizes the present situation and development trend of the domestic and foreign diesel engines, and has expounded the background of developing the YC4 S diesel, which has provided necessary basis for adopting the CAE technology during the research process of the YC4 S diesel.(2) The power, cost effectiveness and emission of the diesel engine are the most important characteristics of the engine, so it is very important to predict the value of these parameters in the drawing design stage. In this paper, the Vibe combustion heat release model and the "Woschni 1978" heat release model are used to predict the power, cost effectiveness and emission performance of YC4 S diesel engine. The research results show that: the engine uses a compression ratio of 18:1, which will increase the original turbocharger by 70%, while the exhaust valve opening angle increases by 10 deg CRA and valve overlap angle decreases by 10 deg CRA to achieve better comprehensive performance. Rated speed average small pressure increases 0.37 bar, power increased by 4.3k W, the minimum fuel consumption is reduced by 3g/(k W/h).(3) Choose different turbocharger to do bench test, test the accuracy of computer simulation analysis, so as to confirm the computer simulation analysis on the diesel engine development process with accurate guiding significance. The test showed that 001 supercharger pressure end: C246(56) 55 Trim, 0.56A/R, T232(50): vortex end 74 Trim, 0.40A/R parameters are reasonable, can get better power and economy.