Computational investigation of multi hydrogen jets at inclined supersonic flow

Scramjet design is directly associated with the fuel mixing inside the combustor. In this study, the influences of the free stream angle on the fuel mixing zone of eight microjets are fully investigated. This study mainly tries to disclose the importance of the fuel jet interaction with a supersonic free stream on penetration and distribution of hydrogen jets. The effects of jet paces and different free stream angles are fully examined in this work. For the computational study, CFD numerical method is applied to obtain the fuel jet structure at supersonic cross-flow. RANS equations with SST turbulence scheme is employed for the simulation of our model. Our simulations show that a positive angle of supersonic incoming flow is effective for the uniform expansion of the fuel mixing zone inside the combustor. According to our findings, increasing the angles of the free stream declines the mixing zone when the fuel jet interaction of the last jets with main stream decreases. Our results indicate that mixing efficiency of -20 degrees is about 30% more than other angles.

Automated summary

This study investigates the influence of free stream angles on fuel mixing in scramjet design, showing that a positive angle can lead to more uniform expansion of the fuel mixing zone. Increasing the angles of the free stream reduces the mixing zone when the fuel jet interaction decreases, with a mixing efficiency of -20 degrees about 30% more than other angles.