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基于拉格朗日拟序结构的局部激励流动分离控制有效性分析方法
引用本文:康伟,张权麒,代向艳,刘磊. 基于拉格朗日拟序结构的局部激励流动分离控制有效性分析方法[J]. 航空学报, 2016, 37(8): 2490-2497. DOI: 10.7527/S1000-6893.2015.0363
作者姓名:康伟  张权麒  代向艳  刘磊
作者单位:1. 西北工业大学 航天学院, 西安 710072;2. 空军工程大学 航空航天工程学院 等离子体动力学重点实验室, 西安 710038
基金项目:国家自然科学基金(11402212),中央高校基本科研业务费专项资金(3102014JCQ01002)National Natural Science Foundation of China(11402212),the Fundamental Research Funds for the Central Universities(3102014JCQ01002)
摘    要:从流体输运角度提出了用于局部周期激励流动分离控制有效性研究的数值分析方法。基于有限时间不变流形理论建立用于非定常流动的流体输运分析方法,并采用数值方法从非定常流场中提取得到吸引拉格朗日拟序结构(LCSs)和排斥LCSs描述流体输运行为。通过对局部周期激励的流动分离控制规律的研究,结果表明存在三种与激励频率相关的影响翼型气动特性的流体输运模式,其中在锁频激励下吸引LCSs在前缘形成的尖楔结构有效增强主流与分离区流体的物质交换,减小翼面流动分离区的面积,显著提高翼型升力。

关 键 词:流动分离  流动控制  锁频  流体输运  拉格朗日拟序结构  增升  
收稿时间:2015-09-16
修稿时间:2015-12-30

A method for effectiveness analysis of flow separation control by local actuation based on Lagrangian coherent structures
KANG Wei,ZHANG Quanqi,DAI Xiangyan,LIU Lei. A method for effectiveness analysis of flow separation control by local actuation based on Lagrangian coherent structures[J]. Acta Aeronautica et Astronautica Sinica, 2016, 37(8): 2490-2497. DOI: 10.7527/S1000-6893.2015.0363
Authors:KANG Wei  ZHANG Quanqi  DAI Xiangyan  LIU Lei
Affiliation:1. School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China;2. Science and Technology on Plasma Dynamics Laboratory, School of Aeronautics and Astronautics Engineering, Airforce Engineering University, Xi'an 710038, China
Abstract:A numerical method for the effectiveness analysis for the flow separation control by local periodic actuation is presented from the perspective of fluid transport. Finite time invariant manifold theory is used for the establishment for fluid transport analysis of unsteady flow. The attracting Lagrangian coherent structures (LCSs) and the repelling LCSs are extracted from the unsteady flow field using numerical method to describe the behaviors of fluid transport. Study on the flow separation control of local periodic excitation indicates that there exist three kinds of fluid transport mode with actuating frequency affecting the aerodynamic performance of the airfoil. In particular, as the actuation with lock-in frequency is activated, the material spike formed at the leading edge from the attracting LCSs effectively enhances the fluid exchange between mainstream and separation region, which reduces the area of separation zone, and significantly improves the airfoil lift.
Keywords:flow separation  flow control  frequency lock-in  fluid transport  Lagrangian coherent structure  lift enhancement
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