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本文使用循环水槽生成恒定均匀的流体过地形产生内波,并借助染色技术、PIV技术和高速图像记录系统来开展相关实验。实验设置了6组不同的障碍比B(障碍物高度与下层水深之比),对均匀流过地形生成内波的演化特征进行了探究。通过定性分析和定量测量表明:当0.60.8时,波形较陡且容易破碎与混合。并且随着障碍比的增加,内波的振幅和能量逐渐增加,波长和生成位置与障碍物间的距离S逐渐减小,并且内波的非线性效应逐渐增强。PIV实验表明当流体经过地形生成内波的过程中,在地形背面会有顺时针涡旋的产生。
In this paper, the circulating water tank is used to generate a constant and uniform fluid over the terrain to generate the internal waves. The related experiments are carried out by means of dyeing technology, PIV technology and high-speed image recording system. Six different obstacles were set up in experiment (B: the ratio of obstacle height to water depth below), and the evolvement characteristics of the internal waves generated by uniform flow through the terrain were explored. Through qualitative analysis and quantitative measurement, it is shown that the waveform of the internal wave is stable and not easily broken when 0.6 0.8 And easy to break and mix. And as the obstacle ratio increases, the amplitude and energy of the internal wave gradually increase, the distance S between the wavelength and the generating position and the obstacle decrease gradually, and the nonlinear effect of the internal wave gradually increases. PIV experiments show that when the fluid passes through the terrain to generate an internal wave, there will be a clockwise vortex on the back of the terrain.