Study on Flow Characteristics of NGV Injectors Using Plungers with Varied Inner Diameters

Abstract

In this study, a plunger and injection nozzle were designed to improve the injector used in multi-point injection NGV engines. The purpose of this study is to analyze the pressure and velocity characteristics of the injector plunger and show mass flow rate trends for the gas injected from the nozzle. Using the ANSYS program, a new injector was modeled according to applicable design variables, and the gas flow into the plunger was visualized. In addition, methane fuel was used in the simulation, and the inlet and outlet of the injector were applied with 8 bars pressure and opening conditions. As a result, in the model with a 1.2 mm inner diameter plunger valve, the mass flow rate of gas injected from the injection nozzle was stable from 0.075 mm to 0.2 mm, and it was possible to reduce the velocity variation and pressure generated inside the plunger.