Influence of extruded injector nozzle on fuel mixing and mass diffusion of multi fuel jets in the supersonic cross flow: computational study

Abstract

The efficient injection system has a great role on the overall enactment of air breathing propulsion systems at supersonic flow. In this work, the usage of extruded multi-injectors in the fuel distribution and mixing through the combustor is fully investigated. The usage of the extruded nozzles considerably intensifies the formation of the vortices nearby the injectors and this research has tried to visualize the role of these vortices on the diffusion of the fuel jet through the combustor of the scramjet. The influences of the jet space on the strength of produced circulations are fully discussed. The simulation of the high-speed air stream moving the combustion chamber with extruded nozzles is done via Computational Fluid dynamics. Based on our computational data, the use of extruded multi-jets enhances the penetration and diffusion of the hydrogen cross jet in supersonic airflow. Increasing the gap between injectors improves fuel mixing performance by up to 27% downstream of the jets, primarily by enhancing the lateral penetration of the fuel jet.

Influence of the non-equal aligned nozzles for fuel injection inside the supersonic combustion chamber

“…The modeling of fuel mixing of the transverse jet at the high-velocity free stream at the combustion chamber is mainly done via solving Reynolds-averaged Navier–Stokes equation (RANS) equations 37 , 38 . The supersonic inflow encounters the fuel jet and the cross-jet flow creates the shock wave near the jet consequently, the energy equation is also coupled for the existence of the shock wave.…”

“…By employing advanced numerical modeling techniques, engineers can analyze the fluid dynamics inside combustion chambers with varying injector sizes, providing insights into flow patterns, fuel dispersion, and combustion characteristics. Such simulations enable the optimization of injector dimensions to achieve the desired fuel–air mixing quality 37 , 38 . Abdollahi et al 37 investigated influence of extruded injector nozzle on fuel mixing and mass diffusion of multi fuel jets in the supersonic cross flow via computational study.…”

Application of multi-extruded fuel injectors for mixing enhancement of hydrogen gas at scramjet engine: computational study

“…The simulation of high-speed air stream with compressibility effects is mainly done via solving RANS equations for continuum domain 37 – 40 . The shock wave formation is inherently happened in our model and consequently, the energy equation must be considered in our modeling 41 , 42 .…”

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

“…There are many studies on the use of geometrically assisted secondary injection. In 2023, Abdollahi et al [95] conducted a numerical simulation study on the application of squeeze-type nozzles in fuel distribution and combustion mixing processes in supersonic combustion chambers. The study showed that the application of squeeze-type multi-nozzles significantly enhanced the formation of vortices near the injector in the combustion chamber.…”