高超声速风洞流场总温测量装置研制

Development of Total Temperature Measurement Equipment in Hypersonic Wind Tunnel Flowfields

总温测量装置用于高超声速风洞流场的温度校测,为克服原有装置响应慢、密封性能差的缺点,研制了新的总温测量装置。本文提出了装置的总体设计思路,对装置的结构形式、热电偶选型、屏蔽罩等进行了详细设计,对关键技术难点采取了解决措施。装配完成后测试了装置的密封性能和时间常数,对装置校准的不确定度进行了计算,测试结果满足指标要求。目前该装置已成功应用于风洞试验中,经过了所有典型试验状态的考验,完全能满足风洞使用要求。由此证明了新装置设计中所采用的小直径偶丝配合屏蔽罩的方式以及一体化加工等特殊工艺方案对于克服原有装置存在的缺点是完全合理可行的。

The total temperature measurement equipment is used for temperature calibration in Hypersonic Wind Tunnel flowfields.In order to overcome the shortcomings of long response time and gas leakage of previous equipments,a new total temperature measurement device is developed.The overall design scheme are presented.The device structure,thermocouple form and shield shade are designed in detail.Solutions to key techniques are given.The sealing property is tested and the time constant is obtained.The calibration uncertainty is computed.Results show that the device can satisfy technical targets.The measurement equipment has been applied to Hypersonic Wind Tunnel tests and experienced various typical test conditions,satisfying practical needs.The effectiveness of the design method in which a small-diameter thermocouple is matched up by a shield shade and the integration process of manufacturing scheme are proven in overcoming the shortcomings of previous equipments.