CAREER: Effects of thermal nonequilibrium on the acoustic noise radiated by a compressible turbulent boundary layer
职业:热非平衡对可压缩湍流边界层辐射的声学噪声的影响
基本信息
- 批准号:1751965
- 负责人:
- 金额:$ 52.84万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-04-01 至 2023-03-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In gaseous flows over solid surfaces, the thin near-wall region can become chaotic and turbulent; these turbulent motions can then cause the generation of intense, outward-propagating sound waves, especially when the flow is supersonic. This project seeks to understand such noise generation when the gas in question (e.g., carbon dioxide, or high-temperature air) absorbs sound waves at certain frequencies. In particular, it is thought that by introducing such a gas into a near-surface flow of air, the noise generation can be reduced in configurations such as high-speed wind tunnels, where this noise can severely contaminate measurements. In conjunction, a variety of educational activities will be undertaken to introduce students at all levels to high-speed flows, including the creation of a YouTube channel where students can suggest objects to be flown in a Mach-8 wind tunnel.A systematic experimental study will be conducted to investigate turbulence-generated noise in the presence of a vibrationally relaxing gas. Acoustic attenuation measurements will be performed in quiescent pure gases (e.g., CO2, N2O) and gas mixtures to identify strong acoustically absorbing combinations at pressures and temperatures relevant to high-speed flows; results will be compared with theoretical attenuation models. Experiments in supersonic and hypersonic wind tunnels will examine the acoustic noise generated by a high-speed turbulent boundary layer: first, with the species identified in the earlier quiescent experiments as test gases; and subsequently with these species introduced locally into the boundary layer of an air flow. Effects of nonequilibrium on surface-pressure and turbulent velocity fluctuations will also be determined. This work will ultimately provide a fundamental understanding of thermal nonequilibrium effects on high-speed turbulence, as well as potentially provide a control mechanism for the reduction of acoustic noise in hypersonic wind tunnels.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
在固体表面上的气体流动中,薄的近壁区域可以变得混乱和湍流;这些湍流运动然后可以导致产生强烈的向外传播的声波,特别是当流动是超音速时。该项目旨在了解当所讨论的气体(例如,二氧化碳或高温空气)吸收某些频率的声波。特别是,人们认为,通过将这种气体引入近表面空气流中,可以减少高速风洞等配置中产生的噪音,而这种噪音可能会严重污染测量结果。与此同时,将开展各种教育活动,向各级学生介绍高速气流,包括创建YouTube频道,让学生可以建议在马赫数为8的风洞中飞行的物体。将进行系统的实验研究,以研究在振动松弛气体存在下的连续性产生的噪声。声衰减测量将在静止的纯气体中进行(例如,CO2,N2 O)和气体混合物,以确定在压力和温度相关的高速流强吸声组合;结果将与理论衰减模型进行比较。在超音速和高超音速风洞中进行的实验将研究高速湍流边界层产生的噪声:首先,将在早期静态实验中确定的物质作为试验气体;然后,将这些物质局部引入气流边界层。还将确定非平衡对表面压力和湍流速度波动的影响。 这项工作将最终提供一个基本的了解热非平衡效应对高速湍流,以及潜在的提供一个控制机制,为减少声噪声在高超音速风洞。这个奖项反映了NSF的法定使命,并已被认为是值得支持的评估使用基金会的知识价值和更广泛的影响审查标准。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A multi-point focused laser differential interferometer for characterizing freestream disturbances in hypersonic wind tunnels
用于表征高超声速风洞中自由流扰动的多点聚焦激光差分干涉仪
- DOI:10.1007/s00348-022-03522-6
- 发表时间:2022
- 期刊:
- 影响因子:2.4
- 作者:Gillespie, Graeme I.;Ceruzzi, Andrew P.;Laurence, Stuart J.
- 通讯作者:Laurence, Stuart J.
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Stuart Laurence其他文献
Super-temporal global reconstruction of convective disturbances from images of two-dimensional flows
- DOI:
10.1007/s00348-025-04015-y - 发表时间:
2025-04-10 - 期刊:
- 影响因子:2.500
- 作者:
Cole Sousa;Stuart Laurence - 通讯作者:
Stuart Laurence
Stuart Laurence的其他文献
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