露天试车台侧风装置气动特性数值模拟
Numerical Simulation of Outdoor Test Bed Crosswind Device Aerodynamic Characteristics
吴志昌 1王宝坤 1李诗军 1杨嵩 1杜长明 1王志鹏1
作者信息
- 1. 中国航发沈阳发动机研究所,沈阳 110015
- 折叠
摘要
为了探究露天试车台侧风装置的气动流场特性,采用商用软件构建了侧风装置的全3维数值模型,完成了侧风装置气动特性的数值模拟.结果表明:安装在靠近侧风装置壁面附近的风机对风场边界产生影响,最中间1台风机排出的气流直接影响速度核心区中心风场,临近最中间水平方向两侧的2台风机排出的气流对关注截面偏离z中心轴线±0.25D位置产生影响;气流从侧风装置排出后可发现核心流速区、掺混区和低速扰动区3个区域,核心流速区内的气流变化平稳,未见大的波动;在以发动机进气轴线为中心d=0.8D直径范围内,随着风速的增大,最大流速差逐渐增大,速度不均匀度逐渐减小.研究结果可为发动机开展侧风试验提供理论和技术基础.
Abstract
In order to explore the aerodynamic flow field characteristics of the crosswind device of an outdoor test bed,a full 3D numerical model of the crosswind device was constructed by using commercial software,and numerical simulations of the aerodynamic characteristics of the device were conducted.The results show that the fans installed near the wall of the crosswind device have an impact on the boundary of the wind field,The airflow discharged from the central fan directly affects the central wind field in the core region,and the airflow dischaged by the two fans on the horizontal center plane which reside on both sides and just next to the centerline has an impact on the positions deviating from the z axis by±0.25D on the interested cross-section(the cross-section that 1.695D away from the outlet of the crosswind device,where D is the outlet hydraulic diameter of the crosswind device).After the airflow is discharged from the crosswind device,three regions can be found:the core velocity region,the mixing region,and the low-speed region.The airflow in the core region changes smoothly without significant fluctuations;Within the range defined by diameter d=0.8D on the interested cross-section,as the wind speed increases,the maximum velocity difference gradually increases and the velocity non-uniformity gradually decreases.The research results can provide theoretical and technical bases for engine crosswind tests.
关键词
露天试车台/侧风装置/气动特性/数值模拟/航空发动机Key words
outdoor test stand/crosswind device/aerodynamic characteristics/numerical simulation/aeroengine引用本文复制引用
出版年
2024
NETL
NSTL
万方数据