| 隔离段横向喷流作用下激波串运动特性研究 |
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| 引用本文： | 李一鸣,李祝飞,杨基明,吴颖川.隔离段横向喷流作用下激波串运动特性研究[J].实验流体力学,2018,32(5):1-6. |
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| 作者姓名： | 李一鸣 李祝飞 杨基明 吴颖川 |
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| 作者单位： | 1.中国科学技术大学 近代力学系, 合肥 230027 |
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| 基金项目： | 国家自然科学基金项目11402263国家自然科学基金项目11621202 |
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| 摘 要： | 在马赫数6的激波风洞中，通过隔离段壁面处的横向喷流控制隔离段反压，借助高速纹影和壁面静压测量，研究了二元进气道/隔离段内激波串运动特性。结果表明:进气道起动后，流场中的反射波系构成了背景激波；开启横向喷流后，隔离段下游气流不断蓄积使得反压升高，隔离段内出现激波串。在反压作用下，激波串逐渐前移，其前沿激波的形态和前移速度受上游背景激波的影响而发生变化；背景激波入射壁面的区域自身存在较强的逆压梯度，能够增强与入射点同侧的前沿激波分支，使得前沿激波急剧前移。前沿激波被推出隔离段后，在进气道肩点附近短暂振荡，反压进一步增大后，进气道不起动并出现喘振。关闭喷流使反压降低后，进气道再起动。
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| 关 键 词： | 激波串 横向喷流 激波风洞 二元进气道 高速纹影 |
| 收稿时间： | 2018-02-23 |
Characteristics of the shock train motions caused by transverse injections into the isolator |
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| Affiliation: | 1.Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China2.Science and Technology on Scramjet Laboratory of Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China |
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| Abstract: | Characteristics of the shock train motions in a two-dimensional inlet/isolator were investigated in a shock tunnel with a nominal Mach number of 6. The backpressure that supported the shock train was well controlled by using transverse injections into the isolator. High-speed schlieren and wall pressure measurements were carried out. Results show that the reflected shock waves in the inlet/isolator started flow form the background shock waves. As the transverse injections are opened, the downstream flow is accumulated with the increase of the backpressure and the induce of the shock train in the isolator. When the shock train moves upstream under the influence of the high backpressure, the shape and intensity of the leading shock in the shock train are changed by the background shock waves. Because strong adverse pressure gradients already exist near the incident points of the background shock waves, the leading shock of the shock train at the same side would be enhanced for moving upstream quickly. As the shock train is expelled out of the isolator, the leading shock oscillates near the shoulder for a short duration, until the backpressure is increased further to initiate the inlet buzz. When the backpressure is reduced by switching off the transverse injections, the inlet restarts. |
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