开孔率对薄壁穿孔平板尾迹的影响研究
Research on the Influence of Porosity on the Wake of Thin Flat Plate
孙康福 1左慧 2范赢 1孙姣 3陈文义1
作者信息
- 1. 河北工业大学,天津 300130;化工节能过程集成与资源利用国家地方联合工程实验室,天津 300130
- 2. 天津天元伟业化工技术有限公司,天津 300384
- 3. 河北工业大学,天津 300130;化工节能过程集成与资源利用国家地方联合工程实验室,天津 300130;天津大学 机械工程学院,天津 300350
- 折叠
摘要
获得低湍流度水平一直是流体力学试验设备风洞或水洞设计的一个难点,通过对如蜂窝器或导流片等薄壁平板整流装置表面开孔来实现尾迹被动控制是一种新的途径.采用粒子图像测速(PIV)技术对开孔率分别为0、7%、14%和21%的薄壁平板的近尾迹区进行了试验研究,获得多种工况的二维速度场信息.结果发现,平板表面开孔改变了平板尾迹的涡旋周期性脱落频率,使尾迹的涡旋尺度多样化;平板穿孔可以有效地降低平板尾迹的湍流强度,降湍收益随着开孔率的增加先增加后趋向不变;平板穿孔可以提高平板尾迹的均匀各向同性.
Abstract
For the design of wind tunnels and water tunnels for fluid mechanics experimental equipment,it has always been difficult to achieve a lower level of turbulence intensity.It is a new control by drilling a hole on the surface of thin flat such as honeycombs or corner vanes.The particle image velocity(PIV)technology is used to conduct experimental research on the near wake of thin flat plates with porosity of 0,7%,14%and 21%respectively,and obtain two-dimensional velocity field information under various working conditions.The results show that the porosity of the plate changed the vortex shedding period and the scale of vortex;the perforation could effectively reduce the turbulence intensity of the wake of the flat plate,and the turbulence reduction benefit increased with the increase of the porosity,the latter trend remains the same;plate perforation can improve the uniformity and isotropy of the plate wake.
关键词
平板尾迹/湍流度/均匀各向同性/流动控制/开孔率Key words
wake of flat plate/turbulence intensity/isotropy/flow control/porosity引用本文复制引用
出版年
2024
NETL
NSTL
万方数据