屏蔽式总温探针流动与换热分析

Aerodynamic and Heat Transfer Analysis of a Shielded Total Temperature Probe

采用定常/非定常数值模拟方法研究了某屏蔽式总温探针的流动与换热特点,讨论了来流马赫数、进出口面积比对其稳态误差的影响,给出了不同条件下屏蔽式总温探针稳态误差的变化规律。结果表明,在来流马赫数0.5条件下,与仅考虑对流换热相比,导热与辐射使屏蔽罩表面最高温度降低约19K;气流在屏蔽室的头部和中部区域形成两个主要的涡区,其中中部的肾型涡尺度最大,是屏蔽室里的主控涡;在高来流马赫数条件下,速度误差和导热误差对进出口面积比的变化非常敏感,总误差随进出口面积比的增大而迅速增大;对于本文研究的探针,在Ma=0.6时,出口半径从1.5mm减小至0.5mm,探针总稳态误差将增大超过12K。

The steady/unsteady numerical simulation method was used to study the aerodynamic and heat transfer characteristics of a shielded total temperature probe. The effects of inflow Mach number and the ratio of inlet and outlet area on the steady state error were discussed. The results show that, under the condition Ma=0.5, heat conduction and radiation can reduce the maximum surface temperature of the shield by about 19K compared with only considering convective heat transfer, and the airflow will form two main vortex regions in the head region and the middle region of the shielding chamber, and the size of the renal vortex region in the middle of the shield chamber is the largest. The velocity error and heat conduction error are sensitive to the change of the inlet and outlet area ratio, and the total error increases rapidly with the increase of the inlet and outlet area ratio. At Ma=0.6, the exit radius is reduced from 1.5mm to 0.5mm, and the total steady-state error of the probe will exceed 12K.