空气动力学学报Issue(3)：416-423,8.DOI:10.7638/kqdlxxb-2013.0051
刚性开孔结构斜风向内压响应的风洞试验研究
Wind tunnel test research of internal pressure response induced by oblique flow for rigid structure with opening
摘要
Abstract
Wind tunnel tests were conducted to study internal pressure response induced by oblique flow for rigid structure with opening.The dynamic internal pressures of rigid structure with single opening were tested induced by both uniform flow and turbulent flow in ZD-1 boundary wind tunnel of Zhejiang Universi-ty.Rigid structure was made of steel plates,The internal volume is 0.0064m3 ,the panel size is 500mm× 500mm,an orifice with the area of 1256mm2 and the depth of 4mm was arranged in the middle of the panel, the shape of the orifice is square,circular and rectangular respectively with aspect ratio of 1∶2.For uniform flow ,the turbulence intensity is less than 0.5% and the wind speed selected as 5m/s,10m/s,15m/s and 20m/s.For turbulent flow,the wind speed is 10m/s and the turbulence intensity is 10% and 20%.The en-closed opening external pressure and internal pressure of structure were tested respectively under the 0°~90° of wind angle with sampling frequency up to 625Hz.The inference of parameters such as wind angle,turbu-lence intensity,wind velocity,orifice characteristics were investigated.The characteristics of dynamic inter-nal pressure induced by oblique flow were analyzed in emphases,and the mechanism of vortex-induced inter-nal pressure resonance was explored preliminarily.The study show that,the difference of internal and exter-nal pressure coefficient in the uniform oblique flow for 55°~75°wind angle is more than 0.2,which confirm that there is drive phenomenon under the oblique flow,and the estimation of mean external wind pressure in opening as mean internal pressure will be dangerous.Vortex-induced internal pressure resonance will appear for rigid structure with opening induced by oblique flow for near 50°wind angle,which lead to fluctuating in-ternal pressure increasing.The vortex shedding resonance effected by the growth of eddies across the orifice and the interaction with the Helmholtz resonance are the mean reasons for the existence of vortex induced in-ternal pressure resonance.Parameter comparison test results show that,the smaller the turbulence intensity and the higher the wind speed,the greater the possibility of vortex-induced resonance.The occurrence of vortex-induced resonance can be inhibited for flat rectangular orifice.关键词
刚性开孔结构/斜风向/湍流强度/涡激共振/Helmholtz 共振Key words
rigid structure with opening/oblique flow/turbulence intensity/vortex-induced resonance/Helmholtz resonance分类
建筑与水利引用本文复制引用
余世策,李庆祥..刚性开孔结构斜风向内压响应的风洞试验研究[J].空气动力学学报,2014,(3):416-423,8.基金项目
国家自然科学基金 （）
