【作者】 郭辉； 淦述荣； 高乐乐； 王海文；

【Author】 Guo Hui~(1,2),Gan Shu Rong~(1,2),Gao Le Le~(1,2),Wang Hai Wen~(1,2) (1.School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China; 2.Key Laboratory of Fluid Mechanics(Beihang University),Ministry of Education,Beijing 100191,China)

【机构】 北京航空航天大学航空科学与工程学院； 流体力学教育部重点实验室(北京航空航天大学)；

【摘要】 上游引入稳定条带是延迟边界层转捩、实现减阻的新思想,其中的转捩控制机制和参数影响复杂,目前尚不够清楚。本项实验研究基于人工激发转捩的平板边界层,利用氢气泡方法开展相关的参数影响研究,包括激发转捩的扰动频率、振幅和条带宽度的影响,重点放在以往尚未涉及的扰动频率的影响。实验结果揭示出条带宽度与转捩过程中发卡涡的展向尺度之间存在耦合机制,在此基础上系统研究和分析了扰动频率、振幅和条带宽度的综合影响,为条带方法应用于边界层自然转捩控制奠定基础。更多还原

【Abstract】 Introducing steady streaks upstream is a novel method to delay boundary,laver transition and to reduce drag.The transition control mechanism and the influence of involved parameters are not sufficiently clear due to the complexity.The influence of the parameters,including frequency and amplitude of the disturbance used to excite boundary,layer transition,as well as streak width,on the control were studied base on the excited transitional plat plate boundary layer in a water tunnel,by using hydrogen bubble method. The study focused on the influence of disturbance frequency,which has never been addressed before.The experimental results revealed the coupling mechanism between streak width and disturbance frequency,base on which,the influence of disturbance frequency and amplitude as well as streak width on the control effects were comprehensively studied laying the foundation for the streak control method using in the practical natural transition.更多还原