涡轮叶片气膜孔像素点清晰度评价

Pixel Definition Evaluation of Turbine Blade Air Film Hole

本文提出了一种涡轮叶片气膜孔像素点清晰度评价方法,利用四方向和八方向Sobel算子,通过赋予不同权重来实现对叶片同折射率材料的标准量块进行像素点清晰度评价。再根据实验结果,对像素点清晰度评价的窗口大小进行讨论,分别计算了不同窗口尺寸的清晰度比率、陡峭度、局部极值因子、灵敏度,最终得出了适合气膜孔像素点评价的窗口尺寸,最后对所有像素点进行计算,对比计算结果与真实情况,验证了提出算法的正确性。

In this paper,an evaluation method of pixel sharpness of turbine blade air film hole is proposed.Due to the poor effect of the traditional Sobel operator edge detection algorithm,the four-direction and eight-direction Sobel operator are proposed to evaluate the pixel sharpness of the standard measurement block of the blade with the same refractive index material by giving different weights.Then,according to the experimental results,the window size of the pixel sharpness evaluation is discussed,and the sharpness ratio,steepness,local extremum factor and sensitivity of different window sizes are calculated respectively.Finally,the window size suitable for the evaluation of the gas film hole pixel is obtained.