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首页> 外文期刊>Measurement Science & Technology >Laser interferometric CT measurement of the unsteady supersonic shock-vortex flow field discharging from two parallel and cylindrical nozzles
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Laser interferometric CT measurement of the unsteady supersonic shock-vortex flow field discharging from two parallel and cylindrical nozzles

机译：激光干涉CT测量从两个平行和圆柱形喷嘴喷出的非恒定超声冲击涡流场

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摘要

Three-dimensional flow phenomena with unsteady shock waves and vortices have been observed in a shock tube experiment by using an interferometric CT (computed tomography) technique. A model with small ducts, which has a pair of cylindrical nozzles, is introduced in the test section of the shock tube. The model can be rotated around its central axis to change the observation angle. The projection image of density distribution for each observation angle is obtained by using a fixed Mach-Zehnder interferometer. The three-dimensional density distribution is reconstructed from these projection images. The shock Mach numbers are fixed to 2.3 at the exits of the nozzles in nitrogen gas of 19.4 kPa initial pressure. The resultant 3D density flow fields are illustrated by several visualizing methods to clarify the 3D features of shock waves, vortices and their mutual interactions.
机译：通过使用干涉CT（计算机断层扫描）技术，在冲击管实验中观察到了具有不稳定冲击波和涡旋的三维流动现象。减震管的测试部分介绍了一种具有小导管的模型，该模型具有一对圆柱形喷嘴。可以围绕模型的中心轴旋转模型以更改观察角度。通过使用固定的Mach-Zehnder干涉仪获得每个观察角的密度分布的投影图像。从这些投影图像重建三维密度分布。在初始压力​​为19.4 kPa的氮气中，喷嘴出口处的冲击马赫数固定为2.3。通过几种可视化方法来说明所得的3D密度流场，以阐明冲击波，涡流及其相互影响的3D特征。

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