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首页> 外文会议>AIAA/CEAS aeroacoustics conference >Unsteady Loading and Dynamic Response of a Structure Excited by a High-Speed Wall-Bounded Jet. Part Ⅰ: Aerodynamic Excitation
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Unsteady Loading and Dynamic Response of a Structure Excited by a High-Speed Wall-Bounded Jet. Part Ⅰ: Aerodynamic Excitation

机译：高速有壁射流激发的结构的非稳态载荷和动力响应。第一部分：气动激励

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High-speed flows over exhaust structures, present in modern embedded engine designs, can be the source of high-cycle fatigue of the structure exposed to the jet. This paper summarizes a benchmark experimental study that examines the flow and random excitation sources responsible for structural loading that can lead to high-cycle fatigue. The emphasis of this study is on a generic jet-plate setup with a high-speed jet scrubbing over a rigid exhaust deck. Flow conditions range from low subsonic to highly under-expanded supersonic The main source for turbulent structural excitations at subsonic jet speeds is postulated to be the free shear layer turbulence from the nozzle lip that drives the development and spatial evolution of the turbulent flow field on the deck. At supersonic flow conditions, the turbulent structures interact with oscillating shocks on the deck, leading to locally increased unsteady pressure amplitudes and a substantially different wall-pressure spectrum underneath the jet. In addition, acoustic phenomena such as jet screech were found to influence the spectra in close proximity to the nozzle. This paper highlights the complexity of the pressure fields encountered in high-speed wall-bounded jets and identifies the important physical mechanisms in the flow field that can drive the adjacent structure. A companion paper investigates the dynamic response of a flexible structure to the aerodynamic and acoustic excitations that are described here.
机译：现代嵌入式发动机设计中存在的排气结构上的高速流动，可能是暴露于喷头的结构的高周疲劳的根源。本文总结了一项基准实验研究，该研究检查了流动和随机激励源造成的结构载荷，这些载荷可能导致高周疲劳。这项研究的重点是在普通的喷射板装置上，在刚性排气甲板上进行高速喷射擦洗。流动条件范围从低亚音速到高度超音速超音速。亚音速喷射速度下湍流结构激发的主要来源被认为是来自喷嘴唇缘的自由剪切层湍流，该湍流驱动湍流场在湍流场上的发展和空间演化。甲板。在超音速流动条件下，湍流结构与甲板上的振荡冲击相互作用，导致局部增加的非稳态压力幅度和射流下方的壁压谱显着不同。另外，发现诸如喷水声的声学现象会影响喷嘴附近的光谱。本文重点介绍了高速壁式喷嘴中遇到的压力场的复杂性，并确定了流场中可驱动相邻结构的重要物理机制。随行论文研究了柔性结构对此处所述的气动和声学激励的动态响应。

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