振动尖塔对风洞模拟大气湍流边界层的作用  

Vibrational spires method in wind tunnel simulation of atmospheric boundary layer

作　　者：陈凯[1] 毕卫涛[1] 魏庆鼎[1] 

机构地区：[1]北京大学湍流与复杂系统研究国家重点实验室,北京100871

出　　处：《空气动力学学报》2003年第2期211-217,共7页Acta Aerodynamica Sinica

基　　金：国家自然科学基金重大资助项目(No.59895410)

摘　　要：针对大气边界层风洞模拟中常常出现的湍流度随高度衰减太快的问题,本文尝试了一种新的被动模拟方法———振动尖塔法。该方法主要采用了具有弹性底座的尖塔型旋涡发生器。尖塔群受风洞自由来流驱动,发生随机振动,向下游流场注入了强烈的低频扰动,致使试验区的湍流度、积分尺度和风谱惯性子区的宽度都明显增加,改善了风洞的模拟性能。A new method, called Vibrational Spires Method, is designed for the wind tunnel simulation of atmospheric boundary layer. The target of the method is mostly to increase the turbulent intensity in the higher area of the simulated atmospheric boundary layer turbulence. Its main idea is using spires that have spring foundations. The spires vibrate violently in free flow, and, therefore, introduce a great deal of low frequency turbulent energy into the downstream turbulence. It has been experimentally verified that the turbulent intensity, the integral scale, and the scope of the inertial range of the simulated atmospheric boundary layer are increased significantly.

关 键 词：振动尖塔法 大气边界层风洞模拟 湍流度 旋涡发生器 大气湍流边界层 建筑物 

分 类 号：TU317.1[建筑科学—结构工程]