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首页> 外文期刊>The Aeronautical Journal >Effect of microramps on flare-induced shock - boundary-layer interaction
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Effect of microramps on flare-induced shock - boundary-layer interaction

机译：微坡道对火炬诱发的冲击-边界层相互作用的影响

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摘要

The ability of microramps to control shock - boundary layer interaction at the vicinity of an axisymmetric compression corner was investigated computationally in a Mach 4 flow. A cylinder/flare model with a flare angle of 25 degrees was chosen for this study. Height (h) of the microramp device was 22% of the undisturbed boundary layer thickness (delta) obtained at the compression corner location. A single array of these microramps with an inter-device spacing of 7.5h was placed at three different streamwise locations viz. 5 delta, 10 delta and 15 delta (22.7h, 45.41h and 68.12h in terms of the device height) upstream of the corner and the variations in the flowfield characteristics were observed. These devices modified the separation bubble structure noticeably by producing alternate upwash and downwash regions in the boundary layer. Variations in the separation bubble's length and height were observed along the spanwise (circumferential) direction due to these devices.
机译：在Mach 4流中，通过计算研究了微斜坡控制轴对称压缩角附近的激振-边界层相互作用的能力。本研究选择了喇叭角为25度的圆柱/喇叭形模型。微型斜坡设备的高度（h）是在压缩角位置获得的未扰动边界层厚度（δ）的22％。将这些微斜坡的单个阵列与装置间的间隔为7.5h放置在三个不同的流向位置，即。观察到拐角上游的5个delta，10个delta和15个delta（就设备高度而言为22.7h，45.41h和68.12h），并且观察到流场特性的变化。这些装置通过在边界层中产生交替的上洗和下洗区域，显着地改变了分离气泡的结构。由于这些装置，沿翼展方向（周向）观察到了分离气泡的长度和高度的变化。

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