吸气-振荡射流激励器振荡特性

孙启翔; 王万波; 黄勇

doi:10.7527/S1000-6893.2021.25627

航空学报 >

2022 , Vol. 43 >Issue 8: 125627 - 125627

DOI: https://doi.org/10.7527/S1000-6893.2021.25627

流体力学与飞行力学

吸气-振荡射流激励器振荡特性

孙启翔 ,
王万波 ,
黄勇

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中国空气动力研究与发展中心低速空气动力研究所, 绵阳 621000

收稿日期: 2021-04-06

修回日期: 2021-06-09

网络出版日期: 2021-06-08

基金资助

国家级项目

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Oscillation characteristics of suction and oscillatory blowing actuator

SUN Qixiang ,
WANG Wanbo ,
HUANG Yong

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Low Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China

Received date: 2021-04-06

Revised date: 2021-06-09

Online published: 2021-06-08

Supported by

National Level Project

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摘要

高效的振荡射流系统需要振荡特性优良的激励器,这要求减少激励器内流损失以提高出流流速、减少射流在0°偏角处的停滞时间以利于在流场中产生非定常旋涡、增大射流偏角以增大控制范围、有效调节振荡频率以接近最优控制频率。现以能大幅减少引入高压气源气体流量的吸气-振荡射流激励器为研究对象,通过数值模拟研究了不同几何外形激励器的起振、出流和频率特性。结果表明:只有当扣除射流宽度后的喉道高度大于反馈通道宽度的1.2倍,且反馈段长度足够、扩张角大小合适时,射流才会稳定振荡,并能与扩张段壁面相切;截短扩张段可使出口处射流中心速度提高67.3%;减小扩张段内分离涡的长宽比最大可使射流扫掠角达到±110°;改变反馈通道的宽度和长度会通过改变通道内通流面积和沿程损失以改变流量,从而影响频率。

关键词： 吸气-振荡射流; 控制效率; 起振特性; 出流特性; 频率模型

本文引用格式

孙启翔 , 王万波 , 黄勇 . 吸气-振荡射流激励器振荡特性[J]. 航空学报, 2022 , 43(8) : 125627 -125627 . DOI: 10.7527/S1000-6893.2021.25627

Abstract

Efficient oscillating jet systems need actuators with excellent oscillation characteristics, which requires reduction of the internal flow losses in the actuator to increase the outflow velocity, reduction of the stagnation time of the jet at 0° deflection angle to generate unsteady vortexes in the flow field, increase of the jet deflection angle to enlarge the control area, and the ability to effectively adjust the oscillation frequency to approach the optimal control frequency. This study takes the suction and oscillatory blowing actuator, which can significantly reduce the gas flow of the high-pressure gas source, as the research object. The characteristics of the start-up, discharge and frequency of the actuator with different geometric shapes are examined by numerical simulation. The results show that only when the throat height after deducting the jet width is larger than 1.2 times of the feedback channel width, the length of the feedback section is sufficient and the expansion angle is appropriate, the jet will oscillate stably and be tangent to the wall of the expansion section. The truncated expansion section can increase the velocity of the jet center at the exit by 67.3% maximally, and reducing the aspect ratio of the separated vortex in the expansion section can maximally increase the jet sweep angle up to ± 110°. Changes in the width and length of the feedback channel will alter the flow rate by changing the flow area and the losses along the channel, thus affecting the frequency.

Key words： suction and oscillatory blowing; control efficiency; start-up characteristics; discharge characteristics; frequency model

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