| 项目编号: | 1706894
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| 项目名称: | Interaction of a Shock wave with a Homogeneous Field of Acoustic Waves: Theory and Simulation |
| 作者: | Lian Duan
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| 承担单位: | Missouri University of Science and Technology
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| 批准年: | 2017
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| 开始日期: | 2017-09-01
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| 结束日期: | 2020-08-31
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| 资助金额: | 83563
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | shock wave
; shock/acoustics interaction
; interaction
; post-shock
; acoustic wave
; homogeneous field
; direct numerical simulation
; stem field
; full-fledged nonlinear simulation
; boundary-layer acoustic radiation
; post-shock total pressure
; incident acoustic field
; linear interaction analysis
; background acoustic noise
; vorticity-dominated incident turbulent field
; shock/turbulence interaction
; post-shock fluctuation
; background acoustic disturbance
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| 英文摘要: | A shock wave occurs when a wave moves faster than the speed of sound in a fluid. The interaction of a shock wave with compressible turbulence is relevant to a wide range of engineering applications including aeronautics (supersonic flight and propulsion), energy (fusion), medicine (shock wave lithotripsy), and space physics (star formation and supernovae explosions). Understanding the physics of the interaction between a shock wave and a homogeneous field of acoustic waves (shock/acoustics interaction) are of major theoretical and practical importance. Given that the coexistence of shock waves with background acoustic noise is an almost unavoidable feature for any experiments conducted in supersonic wind tunnels, the study of shock/acoustics interaction is particularly important to the characterization of background acoustic disturbances in supersonic wind tunnels and to the extrapolation of measurement data obtained in noisy supersonic wind tunnels to free flight. The experiences and results gained from the research effort are being incorporated into education activities including classroom teaching, research training, and outreach activities via involvement in Missouri S&T Student Diversity, Outreach and Women?s Programs in order to engage students to consider careers in STEM fields.
In this research project, significant flow characteristics associated with a homogeneous field of acoustic waves passing through a nominally normal shock wave are quantified using direct numerical simulations and linear interaction analysis. The full-fledged nonlinear simulations and the linear analysis are enabled by a pre-cursor numerical database of boundary-layer acoustic radiation that provides incident acoustic fields with a high degree of physical realism and applicability. This study advances the state of the art knowledge of shock/acoustics interaction, including (1) the generic statistical and spectral features of the post-shock fluctuations and their dependence on flow parameters; (2) the distinctions between linear and nonlinear mechanisms; and (3) the transfer function associated with the total pressure and the contribution of individual Kovasznay modes to the post-shock total pressure. This research contributes to the fundamental understanding of the interaction of a shock wave with a field of turbulence by characterizing its behaviors in the pure dilatational limit and complements existing studies of shock/turbulence interaction with a vorticity-dominated incident turbulent field. The project also provides the basis for measuring tunnel freestream noise with intrusive probes in noisy supersonic wind tunnels and for elucidating the impact of facility noise on the experimental data obtained in such wind tunnels. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/89134
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Lian Duan. Interaction of a Shock wave with a Homogeneous Field of Acoustic Waves: Theory and Simulation. 2017-01-01.
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