激光多普勒测速圆环壁面窗口折射效应的影响

doi:10.3901/JME.2018.02.225

机械工程学报 ›› 2018, Vol. 54 ›› Issue (2): 225-232.doi: 10.3901/JME.2018.02.225

• 交叉与前沿 • 上一篇

激光多普勒测速圆环壁面窗口折射效应的影响

李春明¹, 李晋¹, 李慎龙^1,2, 魏巍³

1. 中国北方车辆研究所北京 100072;
2. 北京理工大学北京电动车辆协同创新中心北京 100081;
3. 北京理工大学机械与车辆学院北京 100081

收稿日期:2016-12-02 修回日期:2017-06-28 出版日期:2018-01-20 发布日期:2018-01-20
通讯作者: 李晋(通信作者),男,1987年出生,博士,工程师。主要研究方向为车辆传动及流体测试技术。E-mail:lijin929@126.com
作者简介:李春明,男,1964年出生,研究员。中国兵器工业集团首席专家,主要研究方向为车辆总体技术。E-mail:chml@noveri.com;李慎龙,男,1982年出生,研究员。主要研究方向为车辆传动技术。E-mail:lishenlong2004@sina.com;魏巍,男,1978年出生,副教授,硕士生研究导师。主要研究方向为车辆传动理论和液力传动技术。E-mail:weiweibit@bit.edu.cn
基金资助:
坦克传动国防科技重点实验室基金资助项目（9140C340204150C34153）。

Refraction Effect from Beam Refraction by Annular Wall Window in LDA Applications

LI Chunming¹, LI Jin¹, LI Shenlong^1,2, WEI Wei³

1. China North Vehicle Research Institute, Beijing 100072;
2. Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100072;
3. School of Mechanical Engineering, BeijingInstitute of Technology, Beijing 100081

Received:2016-12-02 Revised:2017-06-28 Online:2018-01-20 Published:2018-01-20

摘要/Abstract

摘要： 采用转盘标定系统和理论分析，对激光多普勒测速仪（Laser Doppler anemometer，LDA）圆环壁面窗口折射效应进行研究，建立描述两束激光轨迹的折射效应理论计算模型，应用此模型推导了测量体位置和速度矢量偏差修正公式，分析不同光束半夹角α₁、内流场介质折射率n₃、圆环壁面厚度d、探头位置对折射效应的影响。应用转盘标定系统对计算模型进行验证，并且进行了条纹畸变折射效应研究。使用相对平移系数k_x、k_y和速度误差△u来评估折射效应对于测量体位置和测速误差的影响。结果表明：控制α₁在10°以内可以忽略其折射效应影响；壁厚d=30时，折射效应产生的k_x、k_y和△u近似为恒定值；壁面两侧折射率尽可能的接近，可减小n₃的折射效应；△u试验数据略小于计算数据，结果相对比较吻合。

关键词: 标定转盘, 测量体偏移, 激光多普勒测速, 条纹畸变, 圆环壁面

Abstract: The influence of laser beam refraction resulting from the annular wall window on refraction effect is investigated both in a theoretical analysis and laser Doppler anemometry(LDA) using a calibration disc. A mathematical procedure, without any simplifications, describing the propagation of two laser beams through an annular window was established to study the effect of refraction on measuring volume(MV) shift in terms of laser beam half angle, annular window thickness, refractive index of the fluid, and LDA probe location. A test system used for LDA calibration was assembled to study this effect of refraction to fringe distortion. The coefficients of relative motion k_x and k_y, and the velocity bias △u relative to the real fluid velocity are used to estimate the refraction influence on MV position and velocity bias. Results show that the effect can be ignored within 10°of the half angle. k_x, k_y, and △u are nearly constant if the thickness of the annular wall window is more than 30mm. The refractive index of the fluid should be matched as near possible with that of the annular wall to minimalize the refractive influence. The velocity bias arising from the change in fringe spacing is smaller than that estimated by the mathematical procedure.

Key words: annular wall window, calibration disk, fringe distortion, laser doppler anemometer, measurement volume shift

中图分类号:

TH137
TH249

李春明, 李晋, 李慎龙, 魏巍. 激光多普勒测速圆环壁面窗口折射效应的影响[J]. 机械工程学报, 2018, 54(2): 225-232.

LI Chunming, LI Jin, LI Shenlong, WEI Wei. Refraction Effect from Beam Refraction by Annular Wall Window in LDA Applications[J]. Journal of Mechanical Engineering, 2018, 54(2): 225-232.

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激光多普勒测速圆环壁面窗口折射效应的影响

Refraction Effect from Beam Refraction by Annular Wall Window in LDA Applications

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