悬停长冠对转旋翼空气动力学计算研究

IF 1.5 4区 工程技术 Q2 ENGINEERING, AEROSPACE
C. Huo, P. Lv, A. Sun
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引用次数: 1

摘要

本文旨在通过开发全三维RANS计算来研究空气动力学,包括长罩对转转子的整体性能和流动特性。通过目前在同一带罩对转转子上的实验验证,采用滑动网格法和扩展喷嘴下游流场的计算区进行了有效的计算;非定常计算的时间平均解表明,下游转子之后出现了更均匀的流动,这意味着反向旋转的后转子极大地补偿和减少了尾流;非定常计算进一步探索了整个系统、沿跨度和叶尖周围的流场。叶片根部和叶尖周围显示了包括涡流及其相互作用在内的复杂流型。为了进一步识别转子配置,研究了转子-转子距离和切换两个转子速度。计算表明,将第二个转子向后设置会降低尾流规模,但会增加下游喷嘴区的尾流强度。然而,对于切换速度的影响,当后转子位于风车下方时,由于上游转子的旋转速度比另一个快得多,计算无法精确求解流量。计算中的所有现象都很好地实现了实验观测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Computational study on the aerodynamics of a long-shrouded contra-rotating rotor in hover
This paper aims to investigate the aerodynamics including the global performance and flow characteristics of a long-shrouded contra-rotating rotor by developing a full 3D RANS computation. Through validations by current experiments on the same shrouded contra-rotating rotor, the computation using sliding mesh method and the computational zone with an extended nozzle downstream flow field effectively works; the time-averaged solution of the unsteady computation reveals that more uniform flow presents after the downstream rotor, which implies that the rear rotor rotating at opposite direction greatly compensates and reduces the wake; the unsteady computations further explore the flow field throughout the whole system, along the span and around blade tips. Complex flow patterns including the vortices and their interactions are indicated around the blade roots and tips. For further identifying rotor configurations, the rotor–rotor distance and switching two rotor speeds were studied. The computation reveals that setting the second rotor backwards decreases the wake scale but increases its intensity in the downstream nozzle zone. However, for the effect of switching speeds, computations cannot precisely solve the flow when the rear rotor under the windmill because of the upstream rotor rotating much faster than the other one. All the phenomena from computations well implement the experimental observations.
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来源期刊
CiteScore
3.00
自引率
7.10%
发文量
13
审稿时长
>12 weeks
期刊介绍: The role of the International Journal of Micro Air Vehicles is to provide the scientific and engineering community with a peer-reviewed open access journal dedicated to publishing high-quality technical articles summarizing both fundamental and applied research in the area of micro air vehicles.
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