跨音速矩形腔体流动中锯齿形阻流板性能的比例效应

2018/12/12   下载量: 3

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应用领域 航空航天
检测样本 航天
检测项目
参考标准 暂无

采用NewWave公司GeminiII型Nd:YAG 双脉冲PIV激光器作光源。1016 × 1008 pixel 分辨率Kodak ES 1 Megaplus型相机做成像部件。LaVision的DaVis 软件平台做全部的数据处理,对跨音速矩形腔体流动中锯齿形阻流板性能的比例效应,进行了实验测量和研究。

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An experimental study was conducted on the effectiveness of sawtooth spoilers at suppressing acoustic tones within a rectangular cavity with a length-to-depth ratio of five and a width-to-depth ratio of two, operating at a freestream Mach number of 0.71. Whereas previous research has focussed on the ratio of spoiler height to boundary-layer thickness (h/δ), this study also considers the effect of the ratio of cavity length to boundary-layer
thickness (L/δ). Using a combination of unsteady pressure measurements and particle image velocimetry, it was established that consideration of the magnitude of both parameters is important when designing passive control methods for transonic cavities. A correlation was developed which suggests that in order to suppress fully the cavity tones, a critical spoiler height, hcr, is defined such that hcr/δ = 0.065 ≤ L/δ ≤ 0.082.

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