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气流温度是发动机工作过程中的重要参数之一.在测量高速、高温气流温度时.由于测温元件的热辐射和热传导损失等,可将其指示温度修正后得到气流的总温.这里介绍的双屏蔽抽气式热电偶传感器具有独特的优点,热辐射和热传导损失很小.实际上可以忽略不计,总温恢复系数是定值,与气流速度无关.在确定热电偶辐射修正试验中可作为测定气流总温的参考传感器,在航空发动机试验中也有不少场合采用该型传感器.参照文献[1]设计抽气式热电偶并对其总温恢复特性进行试验.试验条件是:气流马赫数M=0.2～0.6,静压为1个大气压.试验结果得出该结构的定值总温恢复系数等.
Air temperature is one of the most important parameters in the working process of the engine. When measuring the temperature of the high-speed and high-temperature air, the total temperature of the air flow can be obtained after the temperature of the air temperature is corrected due to the heat radiation and the heat conduction loss of the temperature measuring element, The double-shielded aspirated thermocouple sensor has the unique advantages of very low thermal radiation and heat transfer losses, virtually negligible, and the total temperature recovery factor is a constant value that is independent of the air flow rate and can be used as a The reference sensor for determining the total temperature of the airflow is used in aero-engine test for many occasions.Referring to the literature [1], design a suction thermocouple and test its total temperature recovery characteristics.The test conditions are as follows: gas flow Mach number M = 0.2 ~ 0.6, the static pressure is 1 atm. The test results obtained the value of the structure of the total temperature recovery coefficient.