Based on the principle of two-phase hydrodynamics and the mechanism of cavitation generation, this paper uses the finite volume method (FVM) in computational fluid dynamics (CFD) to analyse the features of fluid flow in jet amplifier, i.e., the pilot stage of jet pipe servo valve, and designs a lab bench to experimentally prove the accuracy of this numerical method. On this basis, the author discussed how four structural parameters influence the amplification efficiency of the jet amplifier. The amplification efficiency of the jet pipe servo valve can be maximized by setting the distance between nozzle and receiving holes of 0.1 mm, the diameter of receiving holes of 0.2 mm, the inclination angle of 22.5°, and the spacing between the two receiving holes of 0 mm (if possible). The research methods and results provide a solid basis for the design and performance prediction of the jet pipe servo valve.

本文基于两相流体动力学原理和空化产生机理，利用计算流体动力学（CFD）中的有限体积法（FVM）分析射流放大器中流体流动的特征，即：射管伺服阀，并设计了一个实验台来实验证明该数值方法的准确性。在此基础上，作者讨论了四个结构参数如何影响射流放大器的放大效率。喷管伺服阀的放大效率可以通过设置喷嘴与接收孔之间的距离为0.1mm，接收孔的直径为0.2mm，倾角为22.5°，以及两个接收孔之间的间距来最大化。 0 毫米（如果可能）。