中文摘要：

射流管喷嘴与接收器之间的流场存在淹没射流等复杂的流动情况，导致流场特性不易预测。在喷嘴形状为矩形的情况下，通过对矩形接收孔和圆形接收孔的射流管伺服比例阀前置放大器进行流场数值仿真，得到了喷嘴位移、接收孔与喷嘴的重合面积、射流管入口压力以及负载对先导级流量的影响。通过比较，发现先导级流量与射流管入口与出口的压差的开方成正比关系，喷嘴位移、接收孔与喷嘴的重合面积以及负载大小对先导级流量的影响较小。建立了射流管流场的等效液压桥路，推导出了先导级流量的方程，并通过泰勒展开式分析了影响先导级流量的因素。提出了流量接收率的概念，并分析了流量接收率对先导级流量的影响。

英文摘要：

It is difficult to predict the characteristics of the flow fields between the jet pipe nozzle and the receiver as there exists a complex turbulent flow like submerged jet. Under the condition that the nozzle is rectangular and that the receiving ports are circular and rectangular respectively, the flow fields are numerically simulated. Then the influence factors of nozzle displacement, overlap areas of the nozzle and the receiving ports, the inlet pressure and load of a jet pipe on the flow rate during the pilot stage are obtained. The simulation results and their comparison show that the flow rate during the pilot stage is proportional to the pressure difference between the inlet and outlet of the jet pipe and that variables such as nozzle displacement, overlap area of the nozzle and the receiving ports and the load have little influence pipe flow field is established on the flow rate during the pilot stage. The equivalent hydraulic bridge road of the jet The nonlinear equations of the flow rate are deduced. The influence factors of the flow rate are analyzed with the Taylor expansion. The concept of acceptance rate of flow rate is put forward and its influence on the pilot stage is analyzed.