| 可压缩混合层密度梯度场特性的实验研究 |
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| 引用本文： | 甘才俊,李烺,毛涛,熊红亮.可压缩混合层密度梯度场特性的实验研究[J].实验流体力学,2011(4). |
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| 作者姓名： | 甘才俊 李烺 毛涛 熊红亮 |
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| 作者单位： | 中国航天空气动力技术研究院; |
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| 基金项目： | 国家自然科学基金资助项目(90305014); 国家科技委973资助项目(2009CB724105) |
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| 摘 要： | 利用纹影技术研究了不同对流马赫数(Mc=0.28,0.38,0.72)可压缩混合层密度梯度场的特性。由纹影图像可以看出:具有可压缩效应(高Mc数)的混合层存在不同程度的摆动。将纹影图像对比以后还发现:当Mc<0.3时,在可压缩混合层中发现了类似于Brown-Roshko的结构,混合层看不出明显的摆动;随着可压缩效应的增强(对流马赫数Mc>0.3),混合层开始摆动,并且随着对流马赫数的增大,混合层开始摆动位置向前移动。此外,还观察到不同对流马赫数下大尺度结构出现的区域有不同的特点。
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| 关 键 词： | 可压缩混合层 对流马赫数 密度梯度场 摆动 纹影技术 |
Experimental research on characteristic of density gradient in a compressible mixing layer |
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| GAN Cai-jun,LI Lang,MAO Tao,XIONG Hong-liang.Experimental research on characteristic of density gradient in a compressible mixing layer[J].Experiments and Measur in Fluid Mechanics,2011(4). |
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| Authors: | GAN Cai-jun LI Lang MAO Tao XIONG Hong-liang |
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| Institution: | GAN Cai-jun,LI Lang,MAO Tao,XIONG Hong-liang(China Academy of Aerospace Aerodynamics,Beijing 100074,China) |
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| Abstract: | Using schliren technique,the characteristic of density gradient in a compressible mixing layer was investigated at different convective Mach numbers(M_c=0.28,0.38,0.72).The instantaneous schlieren images show that a compressible mixing layer begins to swing at higher M_c number.Compared the schlieren images at different M_c numbers,structures similar to Brown-Roshko have been observed for M_c<0.3.In addition,the compressible mixing layer begin to swing with the increase of compressibility effect(convective ... |
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| Keywords: | compressible mixing layer convective Mach number density gradient swing schlieren technique |
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