A high-performing sawtooth plasma actuator with multi-electrodes

Wong Chi Wai; Shao Xiao; Wang LongjunZhou Yu

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A high-performing sawtooth plasma actuator with multi-electrodes

机译：A high-performing sawtooth plasma actuator with multi-electrodes

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The present study for the first time develops a high performing sawtooth plasma actuator (PA) that may produce large flow velocity u and streamwise vorticity omega(x)' by means of increasing the number of electrodes. This improved performance is crucial for improving the post-stall airfoil aerodynamics. It is found that the high performing sawtooth PA with three encapsulated electrodes powered by + V-dc (hereafter called the optimum sawtooth PA) produces the maximum omega(x)' and u of 650 s(-1) and 6.83 m/s, respectively. The plasma-induced flow is linked to the acceleration of the negatively charged species in the streamwise direction caused by the + V-dc-powered encapsulated electrodes and is 26.5% larger than that produced by a standard sawtooth PA (with two sawtooth electrodes) under the same power consumption. At a chord Reynolds number Re = 1.0 x 10(5), the optimum sawtooth PA under steady mode actuation postpones the stall angle-of-attack alpha of a NACA 4412 airfoil by 4 degrees and increases the maximum lift coefficient C-L by 8.1%; the former is appreciably larger than that (0 degrees.) achieved by the standard sawtooth PA. Furthermore, under the optimum burst mode actuation (non-dimensional burst frequency F+ = 1.4 and duty cycle DC = 7%), the stall alpha and the maximum C-L increase by 5 degrees and 19.6%, respectively, along with a 93% power saving. The physical mechanisms behind the impressive performance are discussed. (c) 2021 Elsevier Masson SAS. All rights reserved.

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《Aerospace science and technology》 |2021年第2期|107221.1-107221.16|共16页
作者
Wong Chi Wai; Shao Xiao; Wang LongjunZhou Yu;
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作者单位

Harbin Inst Technol, Ctr Turbulence Control, Shenzhen 518055, Peoples R China;

Harbin Inst Technol, Ctr Turbulence Control, Shenzhen 518055, Peoples R China|Beihang Univ, Ningbo Inst Technol, Aircraft & Prop Lab, Ningbo 315832, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类航空;
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A high-performing sawtooth plasma actuator with multi-electrodes

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