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Effect of vortex dynamics and instability characteristics on the induced drag of trailing vortices

Chinese Journal of Aeronautics 2022年第9期35卷 160-173页

作者： Zepeng CHENG Shiyan ZHANG Yang XIANG Chun SHAO Miao ZHANG Hong LIU Yingchun CHEN School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Aircraft Design and Research Institute Commercial Aircraft Corporation of China Ltd.Shanghai 201210China

In this paper, trailing vortices generated by three wingtip configurations, namely the M6wing and the M6 wing with a blended or split winglet, are experimentally investigated using the Stereo Particle Image Velocimetry(SPIV) technology. Then, linear stability analysis is performed to investigate instability characteristics. Three corresponding trailing vortex patterns, including the isolated trailing vortex without wake(pattern v) and with wake(pattern v-w), co-rotating vortex pair(pattern v-v), are observed in experiments. The strength of trailing vortices, characterized by circulation, is reduced after installing winglets as expected, and the strength of pattern v-v can be further suppressed compared with pattern v-w. Moreover, instability characteristics, such as the eigenvalue spectrum and perturbation mode, are distinctive among these three vortex patterns.The distribution of eigenvalue spectrums indicates that pattern v and pattern v-w are temporally“marginally stable”, while pattern v-v is temporally “unstable.” The primary perturbation mode of pattern v and pattern v-w is the m =-1 helical mode, while |m|>1 for the case of pattern v-v.The effect of vortex dynamics and instability characteristics can be concluded in two aspects.Firstly, the value of induced drag is polluted by about 3% from vortex wandering since vortex wandering affects the tangential velocity and streamwise vorticity of trailing vortices. Secondly, the growth rate and penetration depth perturbation mode affect trailing vortex evolution and further affect induced drag. Specifically, the larger the growth rate and penetration depth are, the more turbulence injects inside the vortex core, thus leading to a quicker and more intense attenuation of trailing vortex, as well as a smaller induced drag. This finding can guide us to manipulate the induced drag in flow control.

关键词： Induced drag Linear stability analysis SPIV trailing vortex vortex flow Winglet

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IMPROVEMENT OF trailing vortex MODEL FOR SINGLE-SCREW POD PROPULSION

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Journal of Hydrodynamics 2004年第4期16卷 492-500页

作者： MACheng QIANZheng-fang YANGChen-jun ZHANGXu DUDu InstituteofNavalVesselsofNAA Beijing100073China StateKeyLaboratoryofOceanEngineering ShanghaiJiaotongUniversityShanghai200030China

Based on previous work on the propulsion performances of single-screwpropeller, the trailing vortex model for the propeller was further improved and a comparison wasmade between the new and original calculations and test results. The comparison shows that thecalculated results obtained with the improved vortex model are more accurate.

关键词： POD propulsion trailing vortex

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EFFECTS OF EXISTENCE OF SEDIMENT PARTICLES ON THE ENERGY LOSS OF FLOW

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International Journal of Sediment Research 1996年第3期 18-24页

作者： LIU Qingquan CHEN Li and LIU Dayou( ,Institute of Mechanics Chinese Academy of Sciences Beijing,P.R.China)( .,Wuhan University of Hydraulic and Electric Eng.Dept.of River Eng.Wuhan, P.R.China)( Institute of Mechanics Chinese Academy of Science,Beijing,P.

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ＥＦＦＥＣＴＯＦＥＸＩＳＴＥＮＣＥＯＦＳＥＤＩＭＥＮＴＰＡＲＴＩＣＬＥＳＯＮＴＨＥＥＮＥＲＧＹＬＯＳＳＯＦＦＬＯＷ￥ＬＩＵＱｉｎｇｑｕａｎ；ＣＨＥＮＬｉａｎｄＬＩＵＤａｙｏｕ（Ａｓｓｏｃ．ＲｅｓｅａｒｃｈＦｅｌｌｏｗ，ＩｎｓｔｉｔｕｔｅｏｆＭｅｃｈａ...

关键词： Two-phase flow Sediment particles. Energy loss Suspended sediment Shearstress Turbulence intensity trailing vortex Damping effect

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