Flow Control over a Conical Forebody by Duty-Cycle Actuations

作     者：ZHENG Borui GAO Chao LI Yibin LIU Feng LUO Shijun 郑博睿;高超;李一滨;刘峰;罗时钧

作者机构：Northwestern Polytechnical UniversityXi’an 710072China University of CaliforniaIrvineCA 92697-3975USA 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2012年第14卷第1期

页      面：58-63页

核心收录：

学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：supported by the Specialized Research Fund for Doctoral Program of Higher Education,SPFDP-200806990003 the Foundation for Fundamental Research of the Northwestern Polytechnical University,NPU-FFR-W018102 

主　　题：conical forebody plasma actuator flow control duty cycle 

摘      要：Duty-cycle modulation alternately blowing from two opposite-facing plasma actu- ators on the leeward surface near the apex of a cone with a 10° semi-apex angle is adopted to control mean lateral force and moment, and the flow control mechanisms are presented. Pressure distributions over the forebody of the cone are measured by steady pressure tappings. The experiments are performed in a 3.0×1.6 m open-circuit wind tunnel at a wind speed of 20 m/s, a 45° angle of attack and a Reynolds number of 2×10^5, based on the diameter of the base of the cone. Almost linearly proportional control of the lateral forces and moments over a slender conical forebody at a high angle of attack has been demonstrated by employing a pair of single dielectric barrier discharge plasma actuators near the apex of the cone, combined with a duty-cycle tech- nique. The pressure distribution measurements indicate that the hi-stable vortex pattern appears to be shifted in the opposite direction when the port or starboard actuator is activated, while the other is kept off during the test. It is shown that the reduced pulse-repetition frequency based on the local diameter at the plasma actuator equal to one yields the highest effectiveness among the cases considered.