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Unsteady characteristics of S-duct intake flow distortion

机译：S型管道进气流量畸变的非稳态特性

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摘要

The unsteady distorted flow fields generated within convoluted intakes can have a detrimental effect on the stability of an aero-engine. The frequency signature in the distorted flow field is of key importance to the engine's response. In this work, time-resolved particle image velocimetry is used to obtain the three-component velocity field at the outlet plane of two S-duct intake configurations for a range of inlet Mach numbers. Proper orthogonal decomposition of the time-resolved velocity data allows the identification of the main frequencies and coherent structures in the flow. The most energetic unsteady structures comprise an in-plane vortex switching mode, associated with a lateral oscillation of the main loss region, and a vertical oscillation of the main loss region. The switching structure occurs at a frequency of St = 0.42 and 0.32 for the high and low offset ducts, respectively. The vertical perturbation is associated with a more broadband spectrum between approximately St = 0.6-1.0 and St = 0.26-1.0 for the high and low offset configurations, respectively. The determined frequencies for these main unsteady flow structures are within the range, which is expected to be detrimental to the operating stability of an aero-engine. The results provide a novel, time-resolved dataset of synchronous velocity measurements of high spatial resolution that enables analysis of the unsteady flows at the exit of complex aero-engine intakes. Crown Copyright (C) 2018 Published by Elsevier Masson SAS. All rights reserved.
机译：在涡旋进气道内产生的不稳定的流场可能会对航空发动机的稳定性产生不利影响。扭曲的流场中的频率信号对于发动机的响应至关重要。在这项工作中，使用时间分辨粒子图像测速仪获得了一系列入口马赫数下两个S管进气道构造的出口平面处的三分量速度场。对时间分辨速度数据进行正确的正交分解可以确定流中的主要频率和相干结构。能量最高的不稳定结构包括与主损耗区域的横向振动和主损耗区域的垂直振动相关的面内涡旋切换模式。对于高偏移导管和低偏移导管，切换结构的频率分别为St = 0.42和0.32。对于高偏移配置和低偏移配置，垂直扰动分别与大约St = 0.6-1.0和St = 0.26-1.0之间的宽带频谱有关。这些主要的非稳态流动结构的确定频率在该范围内，这预计会损害航空发动机的运行稳定性。结果提供了一个新的，时间分辨的，具有高空间分辨率的同步速度测量数据集，该数据集能够分析复杂航空发动机进气口出口处的不稳定流量。官方版权（C）2018，由Elsevier Masson SAS发布。版权所有。

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  • 来源
    《Aerospace science and technology》 |2019年第1期|938-952|共15页
  • 作者

    Gil-Prieto Daniel; Zachos Pavlos K.; MacManus David G.; McLelland Grant;

  • 作者单位

    Cranfield Univ, Sch Aerosp Transport & Mfg, Prop Engn Ctr, Cranfield MK43 0AL, Beds, England;

    Cranfield Univ, Sch Aerosp Transport & Mfg, Prop Engn Ctr, Cranfield MK43 0AL, Beds, England;

    Cranfield Univ, Sch Aerosp Transport & Mfg, Prop Engn Ctr, Cranfield MK43 0AL, Beds, England;

    Cranfield Univ, Sch Aerosp Transport & Mfg, Prop Engn Ctr, Cranfield MK43 0AL, Beds, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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