| 前缘形状对钝三角翼边界层稳定性及转捩的影响 |
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| 作者姓名： | 马祎蕾 余平 刘璟 梁伟栋 王建林 |
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| 作者单位： | 中国运载火箭技术研究院空间物理重点实验室, 北京 100076 |
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| 基金项目： | 国家重点研发计划2018YFB1701600 |
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| 摘 要： | 选择典型高速流动条件，基于线性稳定性理论研究了不同前缘几何特征对典型大后掠角平板钝三角翼外形高速边界层流动稳定性及转捩的影响.研究表明，椭前缘（截面为椭圆）形状的变化仅影响前缘附近的流场特征和边界层流动稳定性；前缘截面长短轴比（形状因子）变大，前缘形状变尖，则横流速度变大，扰动波增长率变大；对于横流模态和第1模态，不同频率扰动波的中性点流向位置随着前缘形状因子变大而后移；对于第2模态，不同频率扰动波中性点的位置基本不变.转捩由第1模态主导，前缘形状因子变大，转捩流向位置后移.
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| 关 键 词： | 平板三角翼 前缘形状 边界层 流动稳定性 转捩 |
| 收稿时间： | 2021-01-16 |
Effects of Leading-Edge Shape on Stability and Transition of Hypersonic Boundary Layer on a Blunt Delta Wing |
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| Affiliation: | Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing 100076, China |
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| Abstract: | Effects of leading-edge shape on stability and transition of three-dimensional hypersonic boundary layer over a flat-plate blunt delta wing with large sweep angles were studied by using linear stability theory (LST) analysis. The results indicate that the effects of the elliptic leading angles shapes on basic flow properties and stability characteristics only exist at regions nearing the leading edge. As the semi-axis ratio of the leading edge cross section (the shape factor of elliptic leading edge) increases, the shape of leading edge becomes sharper, the cross flow velocity and growth rate of disturbance wave are strengthened. However, influences of sharpening the shape of the elliptic leading edge on neutral points of different modes are different, which are postponing for cross modes and first modes, and barely moving for second modes. As a result, the transition location, which is dominated by first modes, moves backward as the shape of leading edge becomes sharper. |
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