Mechanism of unsteady aerodynamic heating with sudden change in surface temperat

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Mechanism of unsteady aerodynamic heating with sudden change in surface temperature

The characteristics and mechanism of unsteady aerodynamic heating of a transient hypersonic boundary layer caused by a sudden change in surface temperature are studied. The complete time history of wall heat flux is presented with both analytical and numerical approaches. With the analytical method, the unsteady compressible boundary layer equation is solved. In the neighborhood of the initial and final steady states, the transient responses can be expressed with a steady-state solution plus a perturbation series. By combining these two solutions, a complete solution in the entire time domain is achieved. In the region in which the analytical approach is applicable, numerical results are in good agreement with the analytical results, showing reliability of the methods. The result shows two distinct features of the unsteady respouse. In a short period just after a sudden increase in the wall temperature, the direction of the wall heat flux is reverted,and a new inflexion near the wall occurs in the profile of the thermal boundary layer. This is a typical unsteady characteristic. However, these unsteady responses only exist in a very short period in hypersonic flows, meaning that, in a long-term aerodynamic heating process considering only unsteady surface temperature, the unsteady characteristics of the flow can be ignored, and the traditional quasi-steady aerodynamic heating prediction methods are still valid.

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作 者: Hao CHEN Lin BAO  
作者单位:Aerodynamics Laboratory, Graduate University of Chinese Academy of Sciences,Beijing 100049, P. R. China 
刊 名:应用数学和力学(英文版)  EI SCI
英文刊名:APPLIED MATHEMATICS AND MECHANICS 
年,卷(期):2009 30(2) 
分类号:O1 
关键词:unsteady aerodynamic heating   hypersonic   unsteady surface temperature   approximate analysis   numerical simulation  
机标关键词:surface temperaturesudden changeaerodynamic heatinghypersonic boundary layerboundary layer equationprediction methodsheat fluxanalytical methodheating processsteady statestime historytime domain 
基金项目:国家自然科学基金 
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