The purpose of this study is to obtain efficient data on mass flow through flow distribution in the gas and nozzle area, which vary according to the inner diameter dimension of the plunger valve, the dynamic component of the NGV injector. The analytical model was designed with 5 models (a, b, base, c, d) by deforming ± 0.4mm units from the base model. The analytical method used CFX, which is a computational fluid program, and the inlet was applied with a total pressure of 8 bars (regulator pressure) and an outlet was applied with an opening pressure of 0 bars to observe the fluid flow. As a result of the analysis, it was established that an injector with reduced plunger valve inner diameter stabilized mass flow data in the initial stroke section via flow resistance, and with the latter stroke, the choking area was generated by the narrow area, effective for flow control. From these results, it can be concluded that the non-uniform growth rate of mass flow can be reduced in the initial stroke section.

injector (NGV), spray nozzle, plunger valve, velocity, mass flow rate.