北京航空航天大学学报 ›› 2019, Vol. 45 ›› Issue (4): 672-680.doi: 10.13700/j.bh.1001-5965.2018.0573

• 论文 • 上一篇    下一篇

低动能来流下背负式进气道非定常流动特性分析

刘志敏1, 闫盼盼2, 张群峰2, 黎星佐1, 孙超3   

  1. 1. 北京航空航天大学 航空科学与工程学院, 北京 100083;
    2. 北京交通大学 土木建筑工程学院, 北京 100044;
    3. 中国航空工业集团有限公司 沈阳飞机设计研究所, 沈阳 110035
  • 收稿日期:2018-09-28 出版日期:2019-04-20 发布日期:2019-04-26
  • 通讯作者: 张群峰 E-mail:zhangqunfeng@263.net
  • 作者简介:刘志敏,男,博士研究生,研究员。主要研究方向:飞行器设计;闫盼盼,男,博士。主要研究方向:应用计算流体力学;张群峰,男,博士,副教授。主要研究方向:应用计算流体力学;黎星佐,男,硕士。主要研究方向:飞行器设计;孙超,男,硕士,高级工程师。主要研究方向:飞行器设计。
  • 基金资助:
    国家自然科学基金(11772314);装备预研领域基金课题(6140206040316JW17001)

Unsteady flow characteristics of dorsal inlet under low-energy inflow

LIU Zhimin1, YAN Panpan2, ZHANG Qunfeng2, LI Xingzuo1, SUN Chao3   

  1. 1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;
    2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
    3. Shenyang Aircraft Design and Research Institute, Aviation Industry Corporation of China, Ltd., Shenyang 110035, China
  • Received:2018-09-28 Online:2019-04-20 Published:2019-04-26
  • Supported by:
    National Natural Science Foundation of China (11772314);National Defense Pre-research Foundation of China (6140206040316JW17001)

摘要: 为了改善飞翼布局背负式S弯进气道低动能来流状态下的流动性能,采用改进的延迟分离涡模拟(IDDES)方法对原型及改进型背负式进气道流场进行了数值模拟研究,对比分析了进气道流量特性及内部脉动压力特性。结果表明:低动能来流时背负式进气道上部唇口附近存在很大的气流转折角,导致唇口产生分离涡;原型进气道唇口分离涡强度高,高能量分离涡在进气道顶部破裂产生了大范围旋涡结构,进一步加剧了流动分离,从而引发进气道内产生强烈的压力脉动,声压级最大幅值高达145 dB;改进型进气道唇口分离涡得到了有效控制,强度大幅下降,进气道内部压力脉动幅值也显著降低,声压级降幅达8 dB;改进型进气道分离的抑制使进气道有效流通截面积增大,质量流量增加。同时,流场出口品质提升,进气道出口综合畸变指数降低了9.5%。

关键词: 背负式S弯进气道, 分离流动, 改进的延迟分离涡模拟(IDDES), 压力脉动, 流量

Abstract: To improve the dorsal S-shaped inlet flow performance of low-energy inflow.The flow fields of both original and improved dorsal inlet were studied by using improved delayed detached-eddy simulation (IDDES) method,and the mass flow and pressure fluctuation characteristics of the two inlets were compared. The results show that, influenced by the fuselage, airflow turning angle near the inlet lip is very large and this will cause the formation of separation bubbles. The intensity of the separation vortex at the lip of the original inlet is very high. When the separation bubbles with high energy break down at the top of the inlet, massive high-strength vortices are created. These high-strength vortices aggravate the separation near the inlet top and cause fierce pressure fluctuations inside the S-shaped inlet. The amplitude of the sound pressure level can reach 145 dB. The strength of separation bubbles inside the improved inlet issuccessfully decreased, which enlarges the effective flow area of the inlet and increases mass flux. The pressure fluctuations inside the S-shaped inlet decrease and the reduction of sound pressure level is up to 8 dB. Meanwhile, the comprehensive distortion coefficient decreased by 9.5% which improves the characteristic of outlet flow field.

Key words: dorsal S-shaped inlet, separated flow, improved delayed detached-eddy simulation (IDDES), pressure fluctuation, flux

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