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提高复杂燃烧流场羟基示踪测速精度的方法

邵珺 Shao Jun,方波浪 Fang Bo-lang,叶景峰 Ye Jing-feng,王晟 Wang Sheng,李景银 Li Jing-yin

Acta Photonica Sinica（2019）

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Abstract
为了提高流速测量精度,研究OH荧光图像背景抑制的方法.分析识别复杂燃烧流场中存在的背景干扰,构建染噪的数值仿真模型;基于干扰图像和OH标记线信号图像的特性,采用空间变换思想,提出了自适应差分法消除发动机燃烧室剧烈反应区域的燃烧OH荧光干扰;利用空域上信号与背景残余的差别,采用空间滤波法优化背景抑制结果,最后对仿真模型和实验图片对比,验证了该方法的有效性,处理前后峰值信噪比提高了11.83 dB,信噪比提高了8.66 dB,速度计算误差改善到了1.2％.该方法可有效的抑制背景噪声,提高测速精度,满足激光诊断系统对测量精度的要求.
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Key words
Complex combustion field,Hydroxyl tagging velocimetry,Velocimetry measurement,Background suppression,Difference transform,Signal to noise ratio
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