羟基分子标记示踪速度测量中的强振动干扰抑制

发布时间：2018-05-29 22:23

本文选题：激光诊断 + 羟基分子标记示踪　；参考：《光学精密工程》2017年07期

【摘要】：针对在发动机实验环境中羟基分子标记示踪速度测量技术受到的强振动干扰问题,通过实验研究分析了标记激光与不同流场作用时产生的辐射光谱特性,设计了在实验中同时拍摄标记基准图像和移动图像的振动干扰抑制方法。对于一般流场,在实验中实时拍摄标记激光瑞利散射作为标记基准图像,而对于含有煤油大分子碳氢燃料的流场甚至是CH_4燃烧场,用标记激光诱导燃料在OH荧光辐射波段的辐射光作为标记基准图像。在超燃发动机的速度测量应用尝试表明,两种方案均可以达到抑制振动的目的。在相对干净的流场区域,前者得到的标记激光图像会受到壁面散射等干扰,基准位置提取不确定度约为0.06mm。在流场中未燃燃料含量比较丰富的区域,后者能够得到清晰的标记基准图像,基准位置提取不确定度可以降至0.03mm,与采用平均方法得到的基准位置提取不确定度相当。
[Abstract]:In view of the strong vibration interference caused by the hydroxy molecular marker tracer velocity measurement technology in the engine experimental environment, the spectral characteristics of the radiation produced by the label laser acting on different flow fields are analyzed experimentally. In this paper, a method of vibration interference suppression is designed, which can simultaneously capture the tagged reference image and the moving image in the experiment. For the general flow field, the labeled laser Rayleigh scattering is taken as the marker reference image in the experiment, but for the flow field containing the kerosene macromolecular hydrocarbon fuel or even the CH_4 combustion field, The labeled laser induced fuel radiation in the OH fluorescence band was used as the labeling reference image. The application of speed measurement in superignition engine shows that both schemes can suppress vibration. In the relatively clean flow field, the labeled laser images obtained by the former are interfered by wall scattering and the uncertainty of the reference position extraction is about 0.06mm. In the region with abundant unburned fuel content in the flow field, the latter can obtain a clear tagged reference image, and the uncertainty of the extraction of the reference position can be reduced to 0.03mm, which is equivalent to the uncertainty of the extraction of the reference position obtained by the average method.
【作者单位】：西北工业大学动力与能源学院;西北核技术研究所激光与物质相互作用国家重点实验室;
【基金】：国家自然基金资助项目(No.91541203,No.91641112)
【分类号】：TN249

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