防灾减灾工程学报2025，Vol.45Issue(2)：416-426,11.DOI:10.13409/j.cnki.jdpme.20230927002
基于协同流壁面射流模拟带倾角下击暴流方法研究
Method for Simulating Inclined Downbursts Based on Co-Flow Wall Jets
摘要
Abstract
Current studies on downbursts mainly employ impinging jet models.However,research on jet inclination angles remains limited,and small scaling ratios hinder investigations of downburst wind field characteristics.To address this,the study first investigated the wind field characteristics of in-clined impinging jets using computational fluid dynamics(CFD),deriving an expression for the wind speed attenuation coefficient in the outflow region under different inclination angles.Subsequently,wall jets were used to simulate large-scale outflow wind fields in downbursts,but the effect of inclina-tion angles on speed attenuation was neglected.Therefore,co-flow was in-troduced to mitigate vis-cous resistance around the jet.Smoke-wire wind tunnel tests and CFD methods were employed,yield-ing an expression for the co-flow-induced attenuation coefficient.Finally,the feasibility of simulating inclination-induced effects in downbursts using wall jets was evaluated.The results showed that:(1)the inclined impinging jet exhibited three-dimensional asymmetry.The atten-uation rate of the maxi-mum horizontal wind speed on the front side decreased with increasing inclination angle,while the half-height wind speed in the wind profile increased by 77.8%at 30° inclination angle.(2)Smoke-wire wind tunnel tests and numerical simulations confirmed that wall jet wind fields resembled the front-side outflow section of downbursts,and the incorporation of co-flow effectively reduced the attenua-tion rate of horizontal wind speed.(3)By establishing a correlation between co-flow-induced and incli-nation-induced wind speed attenuation coefficients,it was feasible to simulate average wind profiles of downbursts at any inclination angle using wall jets,providing a novel approach for simulating large-scale downbursts with inclination angles.关键词
下击暴流/冲击射流/壁面射流/倾角/协同流/大尺度Key words
downburst/impinging jets/wall jets/inclination angle/co-flow/large scale分类
建筑与水利引用本文复制引用
何伟,张宇,刘千权..基于协同流壁面射流模拟带倾角下击暴流方法研究[J].防灾减灾工程学报,2025,45(2):416-426,11.基金项目
国家自然科学基金项目(51168020)资助 （51168020）
