航空学报 > 2013, Vol. 34 Issue (8): 1757-1767   doi: 10.7527/S1000-6893.2013.0261

一种控制气流分离的无源微脉冲射流技术研究

朱剑锋, 黄国平, 傅鑫, 付勇   

  1. 南京航空航天大学 能源与动力学院, 江苏 南京 210016
  • 收稿日期:2012-10-15 修回日期:2013-05-17 出版日期:2013-08-25 发布日期:2013-05-20
  • 通讯作者: 黄国平 E-mail:hgp@nuaa.edu.cn
  • 作者简介:朱剑锋 男,博士研究生。主要研究方向:流动分离及流场控制,叶轮机械气体动力学。Tel:025-84896887 E-mail:zhjf@nuaa.edu.cn;黄国平 男,博士,教授,博士生导师。主要研究方向:叶轮机械气体动力学,微型发动机技术,高超声速推进系统。Tel:025-84890912 E-mail:hgp@nuaa.edu.cn
  • 基金资助:

    国家自然科学基金(51176072);江苏省普通高校研究生科研创新基金(CXLX11_0216)

Investigation of Technology for Controlling Flow Separation by Micro-pulsed-jet Without External Device

ZHU Jianfeng, HUANG Guoping, FU Xin, FU Yong   

  1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2012-10-15 Revised:2013-05-17 Online:2013-08-25 Published:2013-05-20
  • Supported by:

    National Natural Science Foundation of China (51176072);Funding of Jiangsu Innovation Program for Graduate Education (CXLX11_0216)

摘要:

基于压气机在大负荷下发生气流分离的流动特征提出了一种无源引气微脉冲射流控制的概念,并对其核心的脉冲射流器进行了特性实验分析,结果表明脉冲射流器能产生明显的脉冲射流且射流频率无级可调。结合无源脉冲射流控制方式建立了一套仿叶栅通道实验模型,得到了无流动控制时通道内稳态及动态压力特性,在设计状态下通道内分离涡主频为266 Hz。对该分离流场进行了脉冲射流控制通道内气流分离的实验研究,实验测量了频率从60 Hz到600 Hz的微脉冲射流对分离流的控制效果。实验结果表明:从通道总压损失减小的效果来看,当脉冲射流频率接近分离涡主频时控制效果最为明显。此时通道内占主导地位的分离涡的周期性特性得到了明显的改善,其他频率的旋涡对流场的影响程度在脉冲射流的作用下被削弱,流场结构较无控、定常射流控制及其他脉冲射流频率状态更为有序。

关键词: 脉冲射流, 非定常, 流动分离, 仿叶栅通道, 实验

Abstract:

Based on the flow separation characteristics in a compressor, a micro pulsed aspirated jet concept is presented and experiments are conducted on them, which shows that an obvious pulsed jet can be generated and the jet frequency can be continuously adjusted.Combined with this new unsteady control method, an imitating cascade channel is established. The steady and dynamic pressure characteristics in the no control state are obtained, and the characteristic frequency of the separated vortex is found to be about 266 Hz. Finally, the experiment of controlling separation flow by pulsed jet is performed, and the frequency of the pulsed jet lies between 60-600 Hz. Results show that when the frequency of the pulsed jet is close to the characteristic frequency of the separated vortex, the control effect is more obvious. Meanwhile, the periodic characteristics of the dominant vortex are significantly improved, while the influence of other vortices on the flow field is weakened. The flow structure is more orderly in comparison to no control, steady control and other frequency pulsed control states.

Key words: pulsed jet, unsteadiness, flow separation, imitating cascade channel, experiment

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