摘要
以上海交通大学在建的多功能低速风洞为研究对象,针对其设计上的独特性,采用CFD方法首次实现对风洞内部流场的整体数值模拟,风扇段流场利用MRF模型处理,数值模拟中计及了阻尼网的整流效果。同经验设计法的气动设计结果进行对比发现,数值模拟得到的流量与设计流量差距很小,压力损失在一定程度上较为吻合。数值模拟揭示了风洞内部存在的流动分离现象,为提高风洞的气动性能提供了改进方向。对风洞同轴度下降引起的流场品质变化进行了分析,结果表明微小同轴度偏差对流场品质的影响不大。
In this paper,the versatile wind tunnel being built in Shanghai Jiao Tong University is taken as the research object.Due to the unique features of the wind tunnel,CFD method is employed to simulate the viscous flow field in the entire wind tunnel for the first time.Muiltiple Reference Frame（MRF）model is used to handle the flow field at the fan section.To obtain accurate results,the damping and protective nets are included.The computed volume flow rate approximates the designed value by the empirical design,while the pressure losses are partly in agreement with the computed results of empirical formulas.The numerical result reproduces the flow phenomena,such as flow separations so as to make it clearly how to improve the performance of wind tunnel.The change of flow field caused by non-axiality in the wind tunnel is investigated,the results show that small change of axiality has little effect on its flow characteristics.CFD simulation has enlightening significances and practical values in wind tunnel aerodynamic design.
出处
《空气动力学学报》
CSCD
北大核心
2014年第2期203-208,213,共7页
Acta Aerodynamica Sinica
基金
上海交通大学"985工程"二期科技创新平台建设项目:风洞循环水槽CFD研究与辅助设计
关键词
低速风洞的气动设计
CFD
阻尼网
流动分离
数值风洞
aerodynamic design of low-speed wind tunnel
computational fluid dynamics（CFD）
damp-ing nets
flow separation
numerical wind tunnel
