Influences of wall vibration on shock train structures and performance of two-dimensional rectangular isolators in scramjet engine
Influences of wall vibration on shock train structures and performance of two-dimensional rectangular isolators in scramjet engine
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壁面振动对超燃冲压发动机激波系结构及二维矩形隔振器性能的影响
DOI：
10.1016/j.actaastro.2019.09.035
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发表时间：
2020
影响因子：
3.5
通讯作者：
Kun Ye
中科院分区：
文献类型：
--
作者：
Xianzong Meng;Zhengyin Ye;Zheng Hong;Kun Ye
激波串是由激波边界层在隔离段内相互作用形成的，以匹配进气道与燃烧室之间的压力。然而，这个问题的复杂性主要局限于没有变形的刚性隔振器。由于结构的弹性，壁面振动对隔离段内流动的影响还知之甚少。目前的研究集中在这个问题上，通过比较13个参数的变化，有关分离区，激波结构，流动不对称性和隔离性能。结果检验了单壁振动、双壁振动和短壁板振动的差异。分析表明，单壁振动将导致分离区上游移动和长度减小，激波串上游移动和长度增长，流动不对称性增加，侧向载荷增大，性能下降。与单壁振动相比，两壁反方向振动对流动结构和隔离段性能的影响较大，而两壁同方向振动对流动结构的影响较小，对流动不对称性和隔离段性能的影响较大。此外，通过在不同位置放置振动板，分析表明，在壁振动中，上游和中游振动的影响比下游振动的影响更大。上游振动对流动结构的影响较大，而中游振动对流动不对称性和隔离段性能的影响较大。本文的研究结果强调了今后研究隔离段气动弹性问题的重要性，并为考虑柔性或振动壁板的流动控制提供了初步的知识。
Shock trains are formed by shock wave boundary layer interaction in isolator to match the pressure between inlet and combustor. However, the complexity of this problem has primarily restricted to rigid isolators without deformation. A little is known regarding the impact of wall vibration, due to structural elasticity, on the flow in isolator. The current study focuses on this problem by comparing changes of 13 parameters regarding separation zone, shock structure, flow asymmetry and isolator performance. Results examine the differences due to one-wall vibration, two-wall vibration and short panel vibration. Analyses indicate that one-wall vibration will cause the upstream movement and length decrease of separation zone, upstream movement and length growth of shock trains, increase of flow asymmetry with large transient side loads and decrease of performance. Moreover, compared to one-wall vibration, two walls vibrating in opposite direction leads to a larger influence on flow structures and isolator performance, while the effect of two-wall vibration in the same direction is relative minor on flow structures and significant on flow asymmetry as well as isolator performance. Furthermore, by placing vibrating panels at different locations, analyses identify that the influence of upstream and midstream vibrations is stronger than downstream vibration in wall vibration. The upstream vibration has a greater impact on flow structures while the midstream vibration has a greater effect on flow asymmetry and isolator performance. The current study emphasizes the importance of future investigations on aeroelastic problem in isolator and provides primary knowledge for flow control by considering flexible or vibrating panel.
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影响因子：
3.5
作者：
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通讯作者：
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