燃烧加热类高超声速高温风洞流场校测与评估

为建立统一的燃烧加热类高超声速高温风洞流场品质评价标准,针对国内6座不同喷管出口直径的燃烧加热类高超声速高温风洞,从统一的皮托压探针、总温探针和流场校测排架设计出发,分别研制了流场校测装置,完成了典型试验状态的流场校测试验。根据相同的数据处理和分析方法得到了相关风洞喷管出口截面的速度场、温度场及均匀区信息。6座风洞速度场均匀区直径分别对应喷管出口直径的73.3%、76.5%、75.0%、80.0%、74.7%、83.3%。根据各风洞流场校测结果,初步掌握了国内同类型风洞流场品质整体水平,提出了当前燃烧加热类高超声速高温风洞流场品质参考评价指标。对于马赫数4.5~6.0的试验状态,风洞速度场均匀区直径应不小于喷管出口直径的70%,均匀区内马赫数标准偏差与平均马赫数的比值应小于2%,总温标准偏差与平均总温的比值应小于5%。

Calibration and Evaluation of Flow Field in Combustion-Heating Hypersonic High-Temperature Wind Tunnels

To establish the uniform flow field quality evaluation criteria in the combustion-heating hypersonic high-temperature wind tunnels, the calibration tests were completed under typical conditions in six domestic same type wind tunnels. Corresponding to the different nozzle exit diameters, the calibration devices were manufactured respectively. Meanwhile, the pitot probes, the total temperature probes and the calibration rakes were designed by uniform methods. The informations of velocity field, total temperature field and uniform region on the nozzle exit sections in those wind tunnels were obtained by the same calculation and analysis methods.. The results indicated that the uniform region diameter in each wind tunnel was separately 73.3%, 76.5%, 75.0%, 80.0%, 74.7%, 83.3% relative to the nozzle exit diameter. Based on the calibration results, the overall level of flow field quality in the domestic same type wind tunnels was preliminarily obtained, and then the reference evaluation criteria of the flow field quality in the current combustion heating hypersonic high-temperature wind tunnels were proposed. Under the test conditons of Mach numbers between 4.5 and 6.0, the diameter of the velocity uniform region should be no less than 70% of the nozzle exit. Meanwhile, in the uniform region, the ratio of standard deviation and mean value of Mach number should be less than 2%, the ratio of standard deviation and mean value of total temperature should be less than 5%.