摘要
为了满足不同空气动力学模型安装的需求,风洞设计成一种试验段可拆卸构造,原来闭口式小型风洞进行试验段拆除可成为开口式风洞,为了提高开口式风洞的流场品质,设计一套包括收集器和小收缩段的整流装置。使用CFD方法对不同类型的风洞进行流场三维数值模拟,湍流模型采用SST k-ω湍流模型,同时,采用眼镜蛇探针对实际的不同类型的风洞流场进行测试实验,主要研究风洞的速度均匀性和湍流强度的变化趋势,对风洞的流场品质进行评估和对比。实验和数值仿真结果证明:模拟的速度和湍流强度剖面与实测具有良好一致性,在风洞试验段平均风速在一定测试风速下,闭口式风洞具备低湍流强度和高流动均匀度的特点的流场品质,其中心区域湍流强度在0.3%以下。此外,证明了这套整流装置的设计可提高了开口式风洞的流场品质,在风洞试验段风速最大速度50%左右时,其中心区域湍流度在0.5%以下,边界层厚度减少到50 mm。这些结论将对小型风洞装置的设计、改进奠定了基础。
In order to meet the installation requirements of different aerodynamic models,the wind tunnel is designed as a structure with removable test segment,so that the original small closed-mouth wind tunnel can become an open wind tunnel by removing the test section.In order to improve the flow field quality of the open wind tunnel,a set of rectifier devices are designed including a collector and a small shrink section.Using CFD method,the flow field numerical values are simulated for different types of wind tunnels,and the turbulence model uses the SST k-ωturbulence model.At the same time,the Cobra probe is used to test the actual types of wind tunnel flow field,mainly to study the change trend of the speed uniformity and turbulence intensity,and to evaluate and compare the flow field quality of wind tunnels.Experimental and numerical simulation results show that the simulated speed and turbulence intensity profile are consistent with the measured.At a specific average wind speed of the wind tunnel test segment,the closed-mouth wind tunnel has the characteristics of low turbulence strength and high flow uniformity,and its central region turbulence intensity is below 0.3%.In addition,it is proved that the design of this rectifier can improve the flow field quality of the open wind tunnel.When the wind speed of the wind tunnel test section is about 50%of the maximum speed,the central area turbulence is below 0.5%,and the thickness of the boundary layer is reduced to 50 mm.These conclusions will lay the foundation for the design and improvement of small wind tunnel installations.
作者
廖鹏
傅继阳
马文勇
何运成
LIAO Peng;FU Ji-yang;MA Wen-yong;HE Yun-cheng(Guangzhou University Wind Engineering and Vibration Engineering Center,Guangzhou 510000,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China)
出处
《工程力学》
EI
CSCD
北大核心
2022年第S01期164-172,共9页
Engineering Mechanics
基金
国家杰出青年科学基金项目(51925802)
河北省风工程和风能利用工程技术创新中心(石家庄铁道大学)开放课题项目(ICWEHB202001)。
关键词
小型风洞
流场品质
整流装置
数值仿真
湍流强度
small wind tunnel
flow field quality
rectification device
numerical simulation
turbulent intensity
