Minimizing airfoil drag at low angles of attack with DBD-based turbulent drag reduction methods  

作　　者：Zhi SU Haohua ZONG Hua LIANG Jun LI Like XIE Xuecheng LIU Weiliang KONG Borui ZHENG 

机构地区：[1]Science and Technology on Plasma Dynamics Laboratory,Air Force Engineering University,Xi’an 710038,China [2]Institute of Aero-engine,School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]The Green Aerotechnics Research Institute of Chongqing Jiaotong University,Chongqing 404100,China

出　　处：《Chinese Journal of Aeronautics》2023年第4期104-119,共16页中国航空学报（英文版）

基　　金：co-supported by the National Natural Science Foundation of China(Nos.12002384,11802341);the National Key Laboratory Foundation of China(No.614220210200112);the National Science and Technology Major Project,China(No.J2019-II-0014-0035);the Aca-demician Workstation Foundation of the Green Aerotechnics Research Institute of Chongqing Jiaotong University,China(No.GATRI2020C06003).

摘　　要：Dielectric Barrier Discharge(DBD)based turbulent drag reduction methods are used to reduce the total drag on a NACA 0012 airfoil at low angels of attack.The interaction of DBD with turbulent boundary layer was investigated,based on which the drag reduction experiments were conducted.The results show that unidirectional steady discharge is more effective than oscillating discharge in terms of drag reduction,while steady impinging discharge fails to finish the mission(i.e.drag increase).In the best scenario,a maximum relative drag reduction as high as 64%is achieved at the freestream velocity of 5 m/s,and a drag reduction of 13.7%keeps existing at the freestream velocity of 20 m/s.For unidirectional discharge,the jet velocity ratio and the dimensionless actuator spacing are the two key parameters affecting the effectiveness.The drag reduction magnitude varies inversely with the dimensionless spacing,and a threshold value of the dimensionless actuator spac-ing of 540(approximately five times of the low-speed streak spacing)exists,above which the drag increases.When the jet velocity ratio smaller than 0.05,marginal drag variation is observed.In con-trast,when the jet velocity ratio larger than 0.05,the experimental data bifurcates,one into the drag increase zone and the other into the drag reduction zone,depending on the value of dimensionless actuator spacing.In both zones,the drag variation magnitude increases with the jet velocity ratio.The total drag reduction can be divided into the reduction in pressure drag and turbulent friction drag,as well as the increase in friction drag brought by transition promotion.The reduction in tur-bulent friction drag plays an important role in the total drag reduction.

关 键 词：Dielectric barrier discharge Dimensionless scaling Plasma actuator Turbulent friction drag WAKE 

分 类 号：V211.41[航空宇航科学与技术—航空宇航推进理论与工程]