S型进气道流动扰动的非稳定特性

2019/01/15   下载量： 8 次

方案摘要

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应用领域 航空航天
检测样本 航空
检测项目
参考标准 暂无

用DEHS发烟机生成示踪粒子。一对1百万像素CMOS相机作成像部件。工作频率16.6KHz。用LaVision的DaVis8.3如件来分析所记录的图像。对结果进行了本征正交分解POD分析。对S-型进气道扰动流场的不稳定性，进行了实验测量和分析。

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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=0.42and 0.32 for the high and low offset ducts, respectively. The vertical perturbation is associated with a more broadband spectrum between approximately St=0.6–1.0and St=0.26–1.0for 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.

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北京欧兰科技发展有限公司
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