液化石油气发动机燃油喷射过程的数值模拟及其试验研究

his paper presents an experimental and computational study on the hydraulic phenomena and the dynamics of conventional pump-pipe-injector fuel supply system in a direct injection diesel engine operated with liquefied petroleum gas (LPG) fuel. Based on the results of computer simulation and validation experiments it is shown that in comparison with larger line oscillations of diesel fuel, retarded start of fuel injection, longer fuel injection duration, higher residual pressure and secondary injection phenomena for LPG have been observed as a result of its higher compressibility and higher vapor pressure. The secondary injection phenomena can be controlled by increasing the relief volume of the delivery valve.