双光程纹影法对火焰温度场的研究
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摘要
通过手机载入一个黑色背景的白点图作为光源,制作出大小、亮度等参数均可连续调节的小而均匀的光源,利用该光源搭建了反射式双光程纹影系统。利用该系统定性地观察了手掌、电烙铁、吹风机、防风火机等的纹影图像,图像效果明显。用迭代法定量计算了防风火机的火焰流场的空气折射率梯度、气体密度和温度,得到的火焰温度与热电偶测量的温度符合较好。
We use a mobile phone to create a light source that is small and uniform,and its size,brightness and other parameters can be continuously adjusted,then we use the light source build a reflective double-pass schlieren system.Using this system qualitatively observed the schlieren image of the palm,electric iron,hair dryer,windproof lighter and so on,the image effect is obvious.The refractive index gradient,gas density and temperature of the flame flow field of the windbreaker were quantitatively calculated using an iterative algorithm.The flame temperature obtained was in good agreement with the temperature measured by the thermocouple.
We use a mobile phone to create a light source that is small and uniform,and its size,brightness and other parameters can be continuously adjusted,then we use the light source build a reflective double-pass schlieren system.Using this system qualitatively observed the schlieren image of the palm,electric iron,hair dryer,windproof lighter and so on,the image effect is obvious.The refractive index gradient,gas density and temperature of the flame flow field of the windbreaker were quantitatively calculated using an iterative algorithm.The flame temperature obtained was in good agreement with the temperature measured by the thermocouple.
引文
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[2] 王鑫,曾翘楚,柴钰奇.测量透明平行玻璃板折射率及厚度[J].物理实验,2017,37(8):51-53.
[3] 孟晟,杨臧健,王明晓,等.纹影定量化在火焰温度测量中的应用[J].实验流体力学,2015(4):65-69.
[4] 李明,祝智伟,杨彦广,等.双光程纹影在高超声速流场显示中的应用[J].红外与激光工程,2017,46(2):164-168.
[5] 李桂春.气动光学[M].国防工业出版社,2007:78-79.
[6] Mazumdar A.Principles and Techniques of Schlieren Imaging[J].Department of Computer Science Columbia University,2013.
[7] 叶继飞,金燕,吴文堂,等.纹影技术中光源的选择与设计方法[J].实验流体力学,2011,25(4):94-98.
[8] 张俊,胥頔,张龙.基于BOS技术的密度场测量研究[J].实验流体力学,2015,29(1):77-82.
[9] 韦仙,冯中营,刘晓菲,等.基于Matlab的迈克尔逊干涉仪测液体折射率仿真研究[J].大学物理实验,2018(2):92-95.
[10] 赵树祥,郭中华,权佩军,等.大气折射率影响因素分析及应用[J].大学物理实验,2018(3):32-35.