Affiliation of Author(s):能源与动力学院
Journal:Acta Astronaut
Abstract:A novel thermal protection concept that combines the aerodome and cooling nitrogen is introduced for aeroheating reduction in high-speed flights. Study involves the fluid–thermal interaction between the blunt body and surrounding fluid. After detailed grid and time step verification and numerical validation with available experimental results, the influence of jet pressure and jet distance on the aeroheating reduction performance are analyzed comprehensively. Results indicate that the advantages of the novel combination of aerodome and cooling nitrogen over the conventional opposing jet are mainly embodied in the following three aspects. Firstly, the stability of both the aerodome-jet and the flow field structure can be ensured in wide ranges of flight speed and jet pressure, due to the existence of aerodome. Secondly, on the premise of providing overall thermal protection for the blunt body, emphasis is placed on the direct and continuous cooling of the front part of blunt body where severe aeroheating occurs. Thirdly, the thermal protection performance can be improved without sacrificing the drag reduction performance by selecting a suitable set of jet pressure and jet distance. © 2019 IAA
ISSN No.:0094-5765
Translation or Not:no
Date of Publication:2019-06-01
Co-author:Qin, Qihao
Correspondence Author:Xu Jinglei