CFD simulation of injector inlet angle and geometry of outlet pressure and velocity value using GOX and LOX fluid

• Main Authors: Wardana, Fiki Maula, Andoko, Ramadhan, Rizky, Prasetya, Riduwan
• Format: Conference Proceeding
• Language: English
• Subjects: Angles (geometry); Flow simulation; Fluid flow; Geometry; Hybrid rocket engines; Injectors; K-epsilon turbulence model; Liquid oxygen; Simulation; Turbulence models; Turbulent flow; Velocity
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0198718

The performance of the hybrid rocket engine (HRE) cannot be separated from the role of the rocket injector. Many things can affect the performance of the injector performance on a hybrid rocket engine. The type of fluid used and the shape of the injector geometry play an important role in affecting the performance of the resulting injector. Simulations were carried out using ANSYS software using the k-epsilon turbulence model. The purpose of this study is to determine the difference in terms of value of the output pressure and fluid velocity which is affected by differences in geometry and the type of fluid used. The geometry variables used in this study are 2 inlet geometric shapes and injector angle variations. The injector angle variations used are 65°, 45°, and 90°. The types of fluid used in the simulation process are gaseous oxygen (GOX) and liquid oxygen fluid (LOX). Based on the simulation results, the largest outlet pressure and velocity are found in the injector design with a first inlet geometry and an angle of 90° using GOX fluid of 2605.33 Pa and 98.7503 m/s. The smallest outlet pressure is found in the injector design with a second inlet geometry and an angle of 65° using LOX fluid of -964,792 Pa and the lowest outlet velocity is found in the injector design with a second inlet geometry and an angle of 90° using LOX fluid, which is 0.0289349 m/s. The outlet pressure value, if analyzed analytically should have a positive value, but the simulation results found some negative results. This happens because of turbulence in the fluid flow simulation which causes the simulation results to be irrelevant when compared to the analytical approach using dynamic fluid equations.