摘要
To explore AC-DBD's ability in controlling dynamic stall,a practical SC-1095 airfoil of a helicopter was selected,and systematic wind tunnel experiments were carried out through direct aerodynamic measurements.The effectiveness of dynamic stall control under steady and unsteady actuation is verified.The influence of parameters such as constant actuation voltage,pulsed actuation voltage,pulsed actuation frequency and duty ratio on dynamic stall control effect is studied under the flow condition of k=0.15 above the airfoil,and the corresponding control mechanism is discussed.Steady actuation can effectively reduce the hysteresis loop area of dynamic lift,and control the peak drag and moment coefficient.For unsteady actuation,there is an optimal duty ratio DC=50%,which has the best effect in improving the lift and drag characteristics,and there is a threshold of pulsed actuation voltage in dynamic stall control.The optimal dimensionless frequency will not be found;different F+have different control advantages in different aerodynamic coefficients of different pitching stages.Unsteady actuation has obvious control advantages in improving the lift-drag characteristics and hysteresis,while steady actuation can better control the large nose-down moment.
作者
杨鹤森
梁华
赵光银
王博
张圣武
孔维良
Hesen YANG;Hua LIANG;Guangyin ZHAO;Bo WANG;Shengwu ZHANG;Weiliang KONG(Science and Technology on Plasma Dynamics Laboratory,Air Force Engineering University,Xi'an 710038,People's Republic of China;State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang 621000,People's Republic of China;National Key Laboratory of Rotorcraft Aeromechanics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,People's Republic of China;Institute of Noise&Vibration,Naval University of Engineering,Wuhan 430030,People's Republic of China;Academician Workstation Foundation of the Green Aerotechnics Research Institute of Chonging Jiaotong University,Chongqing 401120,People's Republic of China)
基金
supported by the China Foundation Enhancement Fund(No.2019-077)
National Natural Science Foundation of China(No.11802341)
Research Project of Academician and Expert Workstation of the Green Aerotechnics Research Institute of Chongqing Jiaotong university(No.GATRI2020C06003)。