Simulation Of Multi-times Injection Multi-parameter Optimization Based On Bio-diesel Engine

Today humans need to quickly resolve the global oil crisis and environmentalpollution. Using green fuels is a major way to solve the oil crisis; continue to developcombustion technology could reduce emissions of pollutants. This article bases onburning biodiesel, according to4100QBZL diesel, models and numerical simulationwere obtained by software Fire on combustion process and pollutants.In order to determine the mixing ratio of biodiesel, firstly, study on combustion law,atomization quality, power performance and emission performance of B10、B20andB30. Studies have shown that: The lowest heat release rate belong to B50, B10、B20and0#diesel have similar the heat release; B50has the worst atomization quality and doesnot meet national standards; B10and B20has the better atomization quality; With theincrease of the mixing ratio, decreased the power performance and decline marginally;Increases in emissions of NOX, the rate of increase is3.5%~9.5%; Decreased theemissions of Soot and the rate of decrease is2.01%~6.24%. Studies have shown that:B20is the best biodiesel blends for simulation injection.Orthogonal experiment should be carried out to match factors of the pre-maininjection interval angle, the pre-injection mass, the pilot injection duration and theignition advance angle. In the case of interaction, the use of analysis of variance toanalysis the power performance and emission performance. Studies have shown that:The impact of various factors on its primary and secondary order for powerperformance is the pre-main injection interval angle, the pilot injection duration, theignition advance angle, the pre-injection mass and the interaction between the factorsare negligible; For the emissions of NOX, the impact of various factors on its primaryand secondary order is similar with power performance, but there is highly significantimpact of interaction between the pre-main injection interval angle to the pre-injectionmass and need to consider; For the emissions of Soot, the impact of various factors onits primary and secondary order is the pre-injection mass, the pre-main injection intervalangle, the ignition advance angle, the pilot injection duration. though there is non-significant effect of the pilot injection duration, highly significant impact of interactionbetween the pilot injection duration to the pre-main injection interval angle and onlyafter the pre-injection mass. A purpose of this article is save non-renewable resources,should try to choose the biodiesel which has a higher proportion of mixed to make simulation of multi-times.Using integrated score, making the multiple performance indicators of dieselengine into a single performance indicators, the impact of various factors on its primaryand secondary order for diesel performance is the pre-main injection interval angle, thepilot injection duration, the ignition advance angle, the pre-injection mass; And theoptimizing combination scheme is A2B2C3D3.