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Quantative measuring technique for the temperature of flow fields in schlieren systems

ZHANG Xiong-xing WANG Wei LIU Guang-hai GUO Zi-long HU Rui

张雄星, 王伟, 刘光海, 郭子龙, 胡锐. 温度场纹影定量测量技术[J]. 中国光学, 2018, 11(5): 860-873. doi: 10.3788/CO.20181105.0860
引用本文: 张雄星, 王伟, 刘光海, 郭子龙, 胡锐. 温度场纹影定量测量技术[J]. 中国光学, 2018, 11(5): 860-873. doi: 10.3788/CO.20181105.0860
ZHANG Xiong-xing, WANG Wei, LIU Guang-hai, GUO Zi-long, HU Rui. Quantative measuring technique for the temperature of flow fields in schlieren systems[J]. Chinese Optics, 2018, 11(5): 860-873. doi: 10.3788/CO.20181105.0860
Citation: ZHANG Xiong-xing, WANG Wei, LIU Guang-hai, GUO Zi-long, HU Rui. Quantative measuring technique for the temperature of flow fields in schlieren systems[J]. Chinese Optics, 2018, 11(5): 860-873. doi: 10.3788/CO.20181105.0860

温度场纹影定量测量技术

doi: 10.3788/CO.20181105.0860
基金项目: 国家自然科学基金项目(No.31671002);陕西省工业科技攻关项目(No.2016GY-051);陕西省教育厅重点实验室科研计划项目(No.15JS035)
详细信息
    作者简介:
  • 中图分类号: TB942

Quantative measuring technique for the temperature of flow fields in schlieren systems

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  • 摘要: 为了研究纹影系统的温度场定量测量技术,本文详细阐述了纹影技术的定量测量原理,并通过分析流场纹影图像灰度大小与未被遮挡的光源像面积的关系,提出了一种新颖的流场温度定量测量的计算方法。首先,在光学平台上搭建了透射式纹影系统,将加热平台放置在该系统的测量区域,利用CCD相机将采集到的纹影图像上传到上位机进行图像处理,然后采用该算法计算得到温度场的测量值,并与热电偶的测量值相对比。实验结果表明:在室温20℃时,将加热平台的温度分别设定为50℃和90℃,纹影系统测量得到的温度值相对误差小于10%,证明了该计算方法的可靠性,实现了以纹影技术为基础的温度场定量测量。
  • 图  1  光在介质中的传播

    Figure  1.  Transmission of light beam in media

    图  2  偏折角θ与偏移量a关系图

    Figure  2.  Relationship between deflection angle θ and offset a

    图  3  刀口切割量与光源像的位置关系示意图

    Figure  3.  Relationship between the position of the blade and light source image

    图  4  图像灰度与刀口遮挡量关系曲线

    Figure  4.  Curve of relationship between image grayness and blade edge occlusion

    图  5  光源像面积变化示意图

    Figure  5.  Area change schematic diagram of the source image

    图  6  实验平台

    Figure  6.  Experimental platform

    图  7  不同温度下加热平台上方纹影图像

    Figure  7.  Schlieren image on the heating platform at different temperatures

    图  8  定量算法计算值与测温仪测量值比较图(上)50 ℃和(下)90 ℃

    Figure  8.  Schlieren image on the heating platform at different temperatures

    表  1  Comparison table of measurement values at 50℃

    Table  1.   Comparison table of measurement values at 50℃

    Height from hot plate/cm Calculation method/℃ Thermocouple measurement/℃ Relative error/%
    0.0 49.3 48.3 2.07
    0.5 46.1 43.2 4.39
    1.0 40.0 37.6 6.38
    1.5 31.5 30.2 4.30
    2.0 30.0 28.3 6.01
    2.5 27.2 26.5 2.64
    3.0 26.3 25.1 4.78
    3.5 24.4 26.0 6.15
    4.0 23.0 25.2 8.73
    下载: 导出CSV

    表  2  Comparison table of measurement values at 90 ℃

    Table  2.   Comparison table of measurement values at 90 ℃

    Height from hot plate/cm Calculation method/℃ Thermocouple measurement/℃ Relative error/%
    0.0 88.3 55.2 59.6
    0.5 53.5 55.1 2.90
    1.0 42.0 40.6 3.45
    1.5 37.5 36.7 2.18
    2.0 36.0 34.4 4.65
    2.5 34.2 33.0 3.63
    3.0 33.9 32.5 4.30
    3.5 32.4 30.0 8.00
    4.0 31.9 29.7 7.40
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-12-17
  • 修回日期:  2018-02-28
  • 刊出日期:  2018-10-01

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