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柴油机性能在很大程度上取决于它的燃油喷射过程。国内外学者在对由喷油泵-高压油管-喷油嘴组成的典型燃油系统进行模拟计算时,均采用一维不稳定管流作为物理模型,且一般假定压力波的传播速度(音速)和燃油密度为定值。随着燃油喷射高压化的发展,这种经典方法引起的计算误差已对模拟计算的实用化带来困难。随着燃油压力的增加,特别是在压力大幅度变化、燃油系内出现气泡后,燃油密度和音速的变化已不容忽视。因此可以认
The performance of a diesel engine depends to a large extent on its fuel injection process. Domestic and foreign scholars use a one-dimensional unstable pipe flow as a physical model in simulating a typical fuel system composed of a fuel injection pump, a high-pressure fuel pipe and a fuel injector, and generally assume that the pressure wave propagation speed (sonic speed) and fuel Density is fixed. With the development of high-pressure fuel injection, the calculation error caused by this classical method has made it difficult to put the simulation into practical use. With the increase of fuel pressure, especially in the pressure changes, the bubbles in the fuel system, the fuel density and sound velocity changes can not be ignored. So you can recognize