根据柱塞运动特性,针对性地提出柱塞穴蚀三维计算模型的建模方法。根据计算结果,以瞬态速度场研究柱塞穴蚀位置机理。三维瞬态计算结果表明,在回油过程中,柱塞表面上半部分区域附近存在涡团运动,燃油气化生成的气泡汇集于此处。因此,在柱塞回油孔上半部分区域出现穴蚀可能性大。 According to the characteristics of plunger movement, the modeling method of plunger cavitation three-dimensional calculation model is proposed. According to the calculation results, the mechanism of plunger cavitation position was studied by transient velocity field. The three-dimensional transient calculation results show that there is vortex movement near the upper half of the surface of the plunger during the oil return process, and the bubbles generated by the fuel gasification pool here. As a result, there is a high probability of cavitation in the upper half of the plunger return hole.