本文详细介绍了透平叶栅端壁换热瞬态测量实验台及实验测量系统的组成和应用。基于红外热成像技术,经过一系列校准步骤,获得准确的端壁温度。使用半无限大平板瞬态导热理论并结合叠加原理,求解端壁换热系数。编写端壁区域组合、边界识别和剔除等算法程序获得完整端壁换热分布。实验结果表明,该测量方法能够获得可靠的透平端壁换热分布结果。对结果分析发现,在靠近端壁吸力面侧,存在明显的“狭长”换热低区,且端壁压力面侧换热程度剧烈,透平叶栅端壁后部呈受着较大热负荷。

In this paper, the composition and application of the turbine cascade endwall heat transfer transient measurement test bench and experimental measurement system are introduced in detail. Based on infrared thermal imaging technology, an accurate endwall temperature is obtained after a series of calibration steps. The semi-infinite plate transient heat conduction theory combined with the Duhamel’s superposition principle is used to solve the endwall heat transfer coefficient. Algorithm programs such as endwall region combination, boundary recognition and culling are programmed to obtain a complete endwall heat transfer distribution. The experimental results show that the measurement method can obtain reliable distribution results of the turbine endwall heat transfer. The results show that there is a significant "narrow and long" heat exchange low zone near the suction side of the endwall, and the heat transfer degree of the endwall pressure side is severe, and the rear part of the turbine cascade endwall is subjected to a large heat load.