| 应用LDV和PIV技术测量波-流系统的粒子速度 |
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| 引用本文： | 沈熊,刘爱林,Grant,I..应用LDV和PIV技术测量波-流系统的粒子速度[J].实验流体力学,1992(2). |
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| 作者姓名： | 沈熊 刘爱林 Grant I. |
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| 作者单位： | 清华大学，英国Heriot watt大学，英国Heriot watt大学 |
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| 摘 要： | 将激光多普勒(LDV)技术同粒子成像测速技术(PIV)结合起来测量波动过程的粒子速度,得到了波槽中规则波的速度振幅剖面和二维空间速度向量分布。实验表明,应用电光调制获得频移的 LDV 系统可以方便地得到周期性交变的连续的实时速度信息,而采用较大直径粒子作为示踪体拍摄到的多次曝光成像照片有助于了解全场平均流动的特征。实验发现,在波流共存的条件下,增大波振幅时,速度剖面有显著的平均速度亏损现象。
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| 关 键 词： | 激光多普勒测速 粒子成像测速 波流共存流动 |
PARTICLE VELOCITY MEASUREMENT IN A WAVE-CURRENT SYSTEM WITH THE LDV AND PIV TECHNIQUE |
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| Shen Xiong.PARTICLE VELOCITY MEASUREMENT IN A WAVE-CURRENT SYSTEM WITH THE LDV AND PIV TECHNIQUE[J].Experiments and Measur in Fluid Mechanics,1992(2). |
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| Authors: | Shen Xiong |
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| Institution: | Shen Xiong(Tsinghua University)Liu Ailin;Grant Ian(Heriot-Watt University) |
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| Abstract: | This paper describes the velocity measurement in a wave-current tank by using the LDV and PIV together.The amplitudeprofiles and 2-D velocity vector distributions of the regular waves areobtained.The experiments show that the frequency shifting LDV sys-tem with an electro-optical modulator can be easily used to obtain thecontinuous oscillating velocity information,while the image photogra-phes taken by the multi-exposures from the larger particles can be ap-plied to evaluate the mean flow properties over the whole field.In thewave-current co-existing system the apparent mean velocity reductionswere found as the wave amplitude increased. |
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| Keywords: | laser Doppler velocimetry particle image velocimetry wave-current coexistent flow |
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