表面热流可辨识性初步分析  

A preliminary analysis of identifiability of surface heat flux

作　　者：钱炜祺[1] 周宇[1] 邵元培[1] 杨驰[2] 黄建栋[2] 

机构地区：[1]中国空气动力研究与发展中心空气动力学国家重点实验室,四川绵阳621000 [2]中国运载火箭技术研究院,北京100076

出　　处：《实验流体力学》2013年第4期17-22,共6页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金(10702076;11072258);空气动力学国家重点实验室基金(SKLA2009A0103)

摘　　要：表面热流的可辨识性分析可用于飞行器防热层内温度测量精度和测温点位置的确定,在工程上有较强的实用意义。从无量纲分析和仿真辨识出发,根据防热层材料热物性系数、测点位置、表面热流的频域特性等参数对表面热流辨识结果的影响规律,总结出了表面热流辨识问题的相似参数:基于表面热流频率参数的傅立叶数。此后,以这一傅立叶数为判据,针对不同测量误差值的情况初步建立起了表面热流可辨识性的准则和分析方法。The analysis of identifiability of surface heat flux can be used to determine the location of the temperature sensor and its measurement accuracy for the TPS（Thermal Protection System）of flight vehicle,which is meaningful in engineering practice.In this paper,based on non-dimensionalization analysis and simulation of surface heat flux estimation,the influences of the thermal parameters of TPS material,the depth location of temperature sensor,and the spectrum characteristic of surface heat flux on the estimation result are collected and a special nondimensional parameter,the Fourier number corresponding on the period of surface heat flux,to scale the heat flux inversion problems is found.Moreover,this Fourier number is used as a criterion,and the rules of identifiability of surface heat flux under different measurement noise levels are developed.

关 键 词：表面热流 可辨识性 傅立叶数 测量噪声 

分 类 号：V212[航空宇航科学与技术—航空宇航推进理论与工程]