Study of density field measurement based on NPLS technique in supersonic flow
Study of density field measurement based on NPLS technique in supersonic flow
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DOI：
10.1007/s11433-009-0180-4
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
L. Tian;S. Yi;Yu-xin Zhao;Lin He;Zhongyu Cheng
中科院分区：
文献类型：
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作者：
L. Tian;S. Yi;Yu-xin Zhao;Lin He;Zhongyu Cheng
由于激波和湍流的影响，超声速密度场呈现出强烈的非均匀性和非定常性。将传统的密度场测量技术应用于超声速流场测量存在时空分辨率低、测量三维密度场的局限性和信噪比低等问题。提出了一种基于纳米平面激光散射（NPLS）技术的超声速密度场测量新方法。该方法通过标定示踪粒子的密度与浓度的关系，测量三维超声速流场的平面瞬态密度场，从而显示出由于激波和旋涡的影响而引起的密度波动。本文介绍了这种新方法在超声速光学弓帽密度场测量中的应用，测量结果显示了流场中的激波、湍流边界层，空间分辨率达到93.2 μm/pixel。通过分析5 μs间隔的结果，可以观察到密度场的时间演化。
Due to the influence of shock wave and turbulence, supersonic density field exhibits strongly inhomogeneous and unsteady characteristics. Applying traditional density field measurement techniques to supersonic flows yields three problems: low spatiotemporal resolution, limitation of measuring 3D density field, and low signal to noise ratio (SNR). A new method based on Nano-based Planar Laser Scattering (NPLS) technique is proposed in this paper to measure supersonic density field. This method measures planar transient density field in 3D supersonic flow by calibrating the relationship between density and concentration of tracer particles, which would display the density fluctuation due to the influence of shock waves and vortexes. The application of this new method to density field measurement of supersonic optical bow cap is introduced in this paper, and the results reveal shock wave, turbulent boundary layer in the flow with the spatial resolution of 93.2 μm/pixel. By analyzing the results at interval of 5 μs, temporal evolution of density field can be observed.