导管内塞式量热计热流测量实验及数值模拟研究
Experimental and numerical simulation studies on heat flux measurement for slug calorimeters in the conduit
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摘要: 对电弧风洞中超声速湍流导管内塞式量热计进行改进,采用测热端与校测件线接触的量热计和测热塞块边缘与校测件有0.4mm 缝隙的量热计。与传统的塞式量热计热流测量值进行对比,实验结果表明,在低压、低冷壁热流条件下3个量热计输出特性较接近;而随着压力、冷壁热流的增加,线接触量热计测量值略有降低,而测热端与校测件有缝隙的量热计测量值大幅增加。最后,通过数值研究了缝隙内的流动对热流测量的影响,同时,模拟了其它来流条件不变时来流马赫数对缝隙内流动的影响。Abstract: The slug calorimeters in the supersonic turbulent conduit of the arc heated wind tunnel were improved.The line-contact calorimeter and the calorimeter which has a 0.4mm gap betwenn the heated end brim of the slug and the test article are adopted.Comparing to measured heat flux data by the typical slug calorimeters,the experimental results show that the output characteristics of the three types of calorimeters have good consistency under the condition of low pressure and low cold-wall heat flux;as pressure increases,the measurement values of the line-contact calorimenters slightly decrease and the measurement values of the 0.4mm gap calorime-ters increase noticeably.To explain the result,the flow characteristics of the 0.4mm gap clorim-enters are investigated.The influence of the free stream Mach number on the flow in the gap is also studied.
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