变状态测量中薄壁量热计后壁导热损失修正  

Heat conduction loss correction of thin-skin calorimeter on back surface for state-variable measurement

作　　者：杨庆涛[1] 白菡尘[1] 刘济春[2] 

机构地区：[1]中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室,四川绵阳621000 [2]中国空气动力研究与发展中心超高速空气动力研究所,四川绵阳621000

出　　处：《航空动力学报》2015年第2期349-355,共7页Journal of Aerospace Power

基　　金：高超声速冲压发动机技术重点实验室开放课题(STSKFKT2012003);中国空气动力研究与发展中心AED项目

摘　　要：针对超燃冲压发动机脉冲燃烧试验需求,基于能量平衡原理给出了对变状态条件下修正薄壁量热计导热损失的一种方法.对薄壁量热计进行了数值分析和试验验证,对比分析了修正前后的薄壁量热计测量结果.有限元分析结果表明,该方法可以有效补偿后壁导热损失,算例中修正前的热流测量误差不小于20%,修正后不大于4%.在超燃冲压发动机脉冲燃烧试验中,利用薄壁量热计与同轴热电偶热流测量了轴对称模型壁面上相同轴向位置的热流,冷态试验中修正前后的薄壁热流与同轴热电偶热流测量结果的相对偏差分别为-11.2%和3.3%.热态试验结果表明,试验中存在振荡燃烧现象,薄壁量热计的响应时间约为0.02s,与振荡周期(约为0.03s)接近,不能正确反映燃烧状态的变化.A heat conduction loss correction method of thin-skin calorimeter under statevariable conditions based on energy balance principle was presented to meet the requirements for scramjet pulse combustion tests.Then thin-skin calorimeter was numerically simulated and verified in a test,and the measurement results with/without correction were compared and analyzed.Finite element analysis showes that the method can compensate the heat conduction loss on the back surface,and the measurement errors of the heat flux with correction are not greater than 4%,while those without correction are not less than 20% for the numerial examples.Thin-skin calorimeter and coaxial thermocouple were used in scramjet pulse combustion test to measure the surface heat fluxes at the same axial positions of the axsymmetric model.In cold-state test,the relative deviation between the heat flux results is-11.2% without correction using thin-skin calorimeter and using coaxial thermocouple,and is 3.3% with correction.Hot-state test results indicate that oscillation combustion occurs during the test,and the thin-skin calorimeter used in the test can not reflect change of thecombustion states because the response time of the thin-skin calorimeter is about 0.02 s,which is close to the oscillation period（about 0.03s）.

关 键 词：薄壁量热计 超燃冲压发动机 热流测量 导热损失 修正方法 

分 类 号：V441[航空宇航科学与技术—飞行器设计]