射流预冷试验用温度探针的设计与测试

针对航空发动机射流预冷试验中气流温度难以测量的问题,设计了1种温度探针,并提出了测温方法,给出了计算气流总温的修正公式。在射流预冷试验台上开展了试验验证,该试验台具有加温、喷射冷却水、使用温度探针测量喷水后混合气流温度的能力。测温试验结果表明:除临近机匣内壁面的测点外,当水气比小于5.5%时,温度探针的测点不遇水。为验证测量方法的准确性,在不同水气比条件下对测量结果与数值模拟结果的偏差进行了比较,并针对截面平均总温的偏差建立拟合曲线。比较结果表明:当水气比在3%以下时,测试结果与模拟结果基本吻合,证明了本测试方法具有可行性。

Design and Test of Temperature Probe for Jet Pre-cooling Test

In order to solve the problem that air flow temperature was difficult to measure in jet pre-cooling test of aeroengine,a temperature probe was designed,and a temperature measurement method was put forward.Modified formula was given to calculate the total air flow temperature.Test verification was carried out on the jet pre-cooling test bench,which had the ability of heating,spraying cooling water and measuring the temperature of mixed air flow after spraying with temperature probe.The test results show that when the ratio of water to gas is less than 5.5%,the measuring point of temperature probe is not met with water except the measuring point near the inner wall of casing.In order to verify the accuracy of the measurement method,the deviation between the measurement results and the numerical simulation results is compared under different water to gas ratio conditions,and the fitting curve is established for the deviation of the average total temperature of the section.The comparison results show that when the ratio of water to gas is less than 3%,the test results are basically consistent with the simulation results,which proves that the test method is feasible.