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瞬态液晶技术广泛应用于燃气轮机内部冷却的表面传热系数测量,获得其误差特性十分重要。本文针对典型的90°肋片内部冷却通道,采用单一液晶和混合液晶,对热敏液晶测温和瞬态液晶技术的测传热系数的误差进行了理论分析和实验研究。结果表明,采用色调标定曲线时液晶测温的误差最小,不超过0.2℃;混合液晶的温度-颜色特性与混合前的单一窄带液晶不同,因此必须对混合液晶进行独立的标定;瞬态液晶测量表面传热系数误差的理论分析和实验结果趋势一致,该误差在13%左右,且选取较高的主流参考温度可以减小误差。
Transient liquid crystal technology is widely used in the surface heat transfer coefficient measurement of gas turbine internal cooling, to obtain its error characteristics is very important. In this paper, a typical 90 ° fin internal cooling channel, using a single liquid crystal and mixed liquid crystal, the thermal liquid crystal temperature measurement and transient liquid crystal technology of heat transfer coefficient of the theoretical analysis and experimental study. The results show that the error of liquid crystal temperature measurement is the smallest when the color calibration curve is used, and the temperature does not exceed 0.2 ℃. The temperature-color property of mixed liquid crystal is different from the single narrowband liquid crystal before mixing, so the liquid crystal must be calibrated independently. The theoretical analysis of the surface heat transfer coefficient error is in agreement with the experimental results. The error is about 13%, and selecting the higher mainstream reference temperature can reduce the error.