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Drag of a D-shaped bluff body under small amplitude harmonic actuation 预览

Drag of a D-shaped bluff body under small amplitude harmonic actuation
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摘要 Open-loop flow control method was used to affect the development of a turbulent wake behind a D-shaped bluff body.Loud speakers were embedded inside the bluff body to produce two zero-net-massflux jets through 2 mm-wide span-wise slots located along the upper and lower edges on the rear wall.The drag forces for different actuation amplitudes(C_μ the ratio between the momentum of the actuating jets and the moment deficit caused by the bluff body) and frequencies(Sr_A) were examined.The effects of the phase difference in the two jets(0 and π) were also studied.It was found that when C_μ was 0.1%,a drag reduction up to 5%was achieved when the velocities of the two jets varied in phase at a frequency of St_A = 0.16.When the velocities of the two jets varied rr out of phase,significant drag increase was observed. Open-loop flow control method was used to affect the development of a turbulent wake behind a D-shaped bluff body. Loud speakers were embedded inside the bluff body to produce two zero-net-mass- flux jets through 2 mm-wide span-wise slots located along the upper and lower edges on the rear wall. The drag forces for different actuation amplitudes (Cμ, the ratio between the momentum of the actuating jets and the moment deficit caused by the bluff body) and frequencies (StA) were examined. The effects of the phase difference in the two jets (0 and π) were also studied. It was found that when Cμ was 0.1%, a drag reduction up to 5% was achieved when the velocities of the two jets varied in phase at a frequency of 5tA = 0.16. When the velocities of the two jets varied π out of phase, significant drag increase was observed.
作者 Yaqing Li Honglei Bai Nan Gao Yaqing Li;Honglei Bai;Nan Gao;School of Aeronautics and Astronautics,Dalian University of Technology;Department of Mechanical Engineering,University of Melbourne;State Key Laboratory of Aerodynamics;
出处 《力学快报:英文版》 CSCD 2015年第1期35-38,共4页 Theoretical and Applied Mechanics Letters
基金 Acknowledgments This work was supported by the National Basic Research Program (2014CB744100), State Key Laboratory of Aerody- namics (SKLA20130102), and Dalian University of Technology (DUT14LK07).
关键词 动阻力 钝体 喷气式飞机 谐波 振幅 速度变化 相位差 流量控制 D-shaped bluff bodyOpen-loop flow controlSynthetic jet
作者简介 E-mail address: gaonan@dlut.edu.cn (N, Gao).
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