Numerical Study of Injected Jets into Supersonic Main Flow from a Porous Cavity

Abstract

This paper investigates jets injection into supersonic main flow, where the jets are surrounded by the porous cavity. This application of the porous cavity to the jet injection aims for the supersonic mixing enhancement. Supersonic mixing technique is important for scramjet engines to improve combustion efficiency. This method using porous cavity has been experimentally studied. However, it is difficult experimentally to measure the mixing efficiency, total pressure loss, and a circulation between the main flow and the cavity flow. Therefore, this paper numerically studies this flow field. In the calculation, Navier-Stokes equations were solved using AUSMDV scheme with 3rd order MUSCL scheme and the four stage Runge-Kutta scheme. Two cases, with the porous cavity and without the porous cavity, were calculated. As a result, a circulation between the main flow and the porous cavity is confirmed. Moreover, it is found that the bow shock wave and the dead water region of the jet were the important factors of this circulation. In addition to the circulation, total pressure loss due to the porous cavity was revealed.

Numerical Simulation of Interaction between Supersonic Flow and Backward Inclined Jets Surrounded by Porous Cavity

“…Therefore, the flow between the main flow and the cavity flow is considered to be affected by the number of jets on the porous wall, jet arrangements, and jet angles. The effects of normal jets on the flow field around a porous cavity have been studied [6] [7]. However, the effects of backward inclined jets on the flow around a porous cavity have been little investigated.…”

“…Therefore, it is important for the mixing technique to clarify the effects of backward inclined jets on the flow Figure 1. Proposed mixing enhancement technique [6] [7]. In the present study, numerical simulations were conducted to investigate the effects of backward inclined jets on the flow field around a porous cavity.…”