山体尾流对烟羽扩散影响的风洞实验

Experimental Investigation of Complex Moun- tain Wave Structure and Its Influence on Pl-ume Diffusion in the Wind Tunnel.

本文以中性模拟的相似参数为判据,用四种不同的方法探测组合山体的流场.根据探测结果,探讨了尾流的结构并进行了较细致的区划.指出复杂地形的摩擦速度(u~*)在近地层不为常数.文中还讨论了尾流中扩散参数的变化及烟羽轴线下倾角分布,指出用修正的高斯烟羽模式描述尾流浓度场的可行性.风洞的实验结果与现场实验结果基本一致.

The similar parameters of neutral simulation were used as criteria in the experiments, the mountain wave structures were measured by four methods, and the effects of wind velocity, wind direction and terrain on the wave structure were given. According to the probed results, the wave structure were further investigated and the wave area was devided in details. And u was not 3 constant in approach flow of complex terrain. The changes of diffussioa parameters and the distribution of declining angles of plume axis in the wave area were also discussed. The results showed that the concentration field in the wave was described by the revised Gauss model that seemed feasible enough. Experimental results obtained from wind tunnel conformed approximately with that from the field.