Numerical evaluation of aerodome and cooling jet for aeroheating reduction

Autor: Jinglei Xu, Qihao Qin
Rok vydání: 2019
Předmět:
Zdroj: Aerospace Science and Technology. 86:520-533
ISSN: 1270-9638
Popis: Thermal protection is one of the major challenges faced by engineers when designing hypersonic vehicles. Mounting a spike ahead of a vehicle's blunt nose provides at least a partial solution for the longtime aeroheating caused by high-speed flow; however, this solution appears inadequate at high Mach numbers. This study presents three innovative solutions, namely, the double-aerodome concept, the introduction of a cooling jet on the aerodome and the combination of both methods. The effectiveness of these solutions is evaluated by applying of a fluid–thermal interaction procedure. Results indicate that the reduction of heat flux on the blunt body persists when the spike length ratio of the double-aerodome model increases. The reduction then reaches a limit, beyond which an abnormal increase occurs due to the reattachment of streamlines onto the spike. In the case of jet on the single-aerodome model, a higher jet pressure ratio delivers a higher level of heat flux reduction. However, the excessive embedment of the jet into the recirculation zone tends to weaken the effectiveness of thermal protection. In addition, the heat flux can be further reduced by over 45% by introducing a cooling jet on the double-aerodome model. The combination of the two approaches also provides additional jet setting options, depending on the role of hypersonic vehicles. More importantly, the improvement in thermal protection performance is not achieved at the expense of drag reduction performance. The maximum increase in drag coefficient is limited to 8.1%.
Databáze: OpenAIRE
Externí odkaz: