Impact of Cowl Deflections on Scramjet Intake Aerodynamics with Shock-on-Lip Condition

Yoga Farhans Muhammad Yuhendri ； Nik Ahmad Ridhwan Nik Mohd ； Shabudin Mat ； Mohd Nazri Mohd Nasir ； Norazila Othman ； Azmin Shakrine Mohd Rafie ； Muhammad Hanafi Azami

《Journal of Aeronautics, Astronautics and Aviation》 55卷3S期 Vol.55 No.3S SAWAE 2022 Special Issue (2023/09) Pp. 461-468

https://doi.org/10.6125/JoAAA.202309_55(3S).05

摘要

The design of the Scramjet intake has a greater effect on the overall performance of the engine than any other component. By adjusting the leading edge's sharpness, length, and deflection, air compression can be maximized. To enhance overall pressure recovery, a shock-on-lip condition is frequently applied to a standard supersonic inlet. The design of a two-ramp mixed compression intake for freestream Mach numbers 5.5 to 7 is examined in this paper, taking into account the shock-on-lip condition in all analyses. Using inviscid numerical models, the effects of the various deflections of the cowl are investigated. Due to the shock-on-lip effect, the captured mass flow rate decreases linearly as the isolator area and height decrease with increasing Mach number. As the Mach number increases, stronger shocks result in higher pressure and temperature ratios. Additionally, the total pressure recovery, which decreases with increasing Mach number, is positively influenced by the angle at which the cowl is deflected. Due to the significant increase in isolator height brought on by the low Mach number shockwave crossing point, shock-on-lip was still present and the results for Mach 5.5 were less than ideal.

關鍵字

Scramjet intake ； aerodynamics ； shock-on-lip ； mixed-compression ； OpenFOAM ； CFD

參考文獻

Urzay J, “Supersonic Combustion in Air-Breathing Propulsion Systems for Hypersonic Flight,” Annual Review of Fluid Mechanics, Vol. 50, 2018, pp. 593-627. https://doi.org/10.1146/annurev-fluid-122316-045217

Zhang Y, Tan HJ, Li JF, Chen H, Wang C, “Technical Notes: Ramp Shock Regulation of Supersonic Inlet With Shape Memory Alloy Plate,” AIAA Journal, Vol. 56, No. 4, 2018, pp. 1696-1702. https://doi.org/10.2514/1.J056318

Khan DA, Hassan MH, Qamar I, “Design Of Hypersonic Scramjet Engine Operating Between Mach 5 To Mach 9,” 6th International Conference on Aerospace Science and Engineering, ICASE 2019. https://doi.org/10.1109/ICASE48783.2019.9059159

Fry RS, “A Century of Ramjet Propulsion Technology Evolution,” Journal of Propulsion and Power, Vol. 20, Issue 1, 2004, pp. 27-58, American Institute of Aeronautics and Astronautics Inc. https://doi.org/10.2514/1.9178

Das S, Prasad JK, “Starting characteristics of a rectangular supersonic air-intake with cowl deflection,” The Aeronautical Journal, Vol. 1153, No. 114, 2016, pp. 177-189. doi: https://doi.org/10.1017/S0001924000003626