采用窄带热敏液晶瞬态单色捕捉技术测量叶片全表面传热系数,以预先加热被测叶片并在主流中快速冷却的方法引入温度阶跃,利用3台3CCD(电荷耦合元件)相机对叶片表面的不同区域进行图像采集记录,将图像坐标转换至叶片空间坐标,通过后处理得到叶片表面传热系数。由实验结果分析可知,叶片前缘区域传热系数最大值位于加速最剧烈处,在吸力面s/L约为0.22处产生轻微流动分离,促使边界层发生转捩,传热系数突然增大。 The whole-surface heat transfer coefficient of the blade was measured by the transient monochromatic capture technology of narrowband thermal liquid crystal. The temperature step was introduced by pre-heating the measured blade and rapidly cooling in the mainstream. Three 3CCD (Charge Coupled Device) The surface of the different regions of the image acquisition and recording, the image coordinates converted to the blade space coordinates obtained by post-processing blade surface heat transfer coefficient. The experimental results show that the maximum value of the heat transfer coefficient in the leading edge of the blade is located at the most intense acceleration, and slight flow separation occurs at a s / L of about 0.22 on the suction side, which causes the boundary layer to turn and the heat transfer coefficient suddenly increases.