LPG双燃料发动机排放性能试验及仿真

为了评价电喷发动机燃用LPG的排放性能,对LPG和93#汽油的常规排放物进行发动机台架试验.试验结果表明：发动机常用工况下,燃用LPG产生的CO、HC和NO均低于燃用93#汽油的排放.为了研究发动机工作参数对排放的影响,应用发动机工作过程软件GT-POWER和化学动力学软件CHEMKIN建立LPG双燃料发动机计算模型,在此基础上对其排放性能进行变参数仿真.仿真结果表明：随着压缩比的升高,NO的排放显著升高;随着空燃比的升高,NO的排放先升高再降低.

Test and simulation research on emission performance of LPG engine

For evaluating the characteristic of LPG applying to the EFI engine, it carries out the bench test research by using LPG and 93# gasoline. The experiments result in the unchanged working condition： CO. HC and NO emissions of the LPG are lower than the 93# gasoline. A numerical simulation model is established by GT-POWER and CHEMKIN. Based on the model, the variable parameters study including air-fuel radio and compression radio are carried out. The model results show that there is a significant improvement of the NO emissions with the compression ratio increases. With the improvement of the airfuel ratio, NO emissions increase first and then decrease.