风洞试验中风剖面的模拟及近流场特性分析

首先简单介绍了日本东京工艺大学风工程研究中心新建的开环流低速边界层风洞中风剖面模拟的试验情况.基于试验结果,采用被广泛应用的三角尖劈加上布置粗糙元的方法,成功地模拟出日本建筑学会定义的四类不同场地对应的风剖面.通过对试验数据的比较分析,就所采用的立方体粗糙元及三角尖劈对最终模拟得到的风剖面特性的影响进行了比较分析.其次,对风剖面模拟及特性判定中的几个重要问题,如三角尖劈的形状优化、风速功率谱的一致性、积分尺度的分析方法等进行了分析.最后,基于以上分析,对在边界层风洞中模拟预定的风剖面提出几点参考意见.

Wind profile modeling in boundary layer wind tunnel and characteristic analysis on simulated approach flow

In this paper, wind profile modeling in the new boundary layer wind tunnel (BLWT) of Wind Engineering Research Center, Tokyo Polytechnics University, Japan, is introduced briefly. Based on the test results, wind speed and turbulence intensity profiles corresponding to four different terrain types defined by Architectural Institute of Japan have been simulated successfully with the widely-used spire-roughness technique. Through comparative analyses of the measured data, effects of different blocks and spires combinations on the final wind profiles in the BLWT are investigated. In addition, several important problems regarding to wind profile modeling and the final characteristics of the simulated approach flow, including optimal shape of spires, consistency of power spectral density distribution and calculation methods for length scales, etc., are discussed. Finally, Based on above analysis, some advices about modeling wind profile in a BLWT and processing the measured data are given for future reference.