根据试验研究和流体动力学基本原理 ,对原有的喷油过程计算模型进行了改进 ,考虑了喷油过程中燃油流动的节流 ,柱塞、针阀偶件间的泄漏以及压力波传播中声速的变化等诸多液力作用的影响 ,使计算模型进一步精确化。计算结果表明 :修改后的模型计算精度较高 ,对不同转速工况的计算结果与试验有较好的吻合 ;能较准确地表达喷油过程压力波主喷射后的反射余波 ,可满足工程实用的要求 According to the experimental research and the basic principles of hydrodynamics, the original injection process calculation model was improved, and the fuel flow throttling, plunger and needle valve leakage and pressure wave propagation were considered The speed of sound changes and many other hydraulic effects, the calculation model to further refinement. The calculation results show that the modified model has higher calculation precision, and the calculated results of different rotational speed conditions are in good agreement with the experimental ones. It can accurately reflect the reflected residual wave after the main injection of pressure wave to meet the practical engineering requirements Request