Numerical Analysis of Flow Noise for Underwater Vehicle
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摘要: 运用大涡模拟（LES）湍流模型及Lighthill声类比理论求解了水下航行器湍流边界层的声场。通过分析发现，水下航行器转捩区比发展区具有更大的声功率密度，且转捩区峰值处在高频区，发展区峰值处在低频区。同时探讨了速度对水下航行器频谱的影响，在速度增加的情况下，水下航行器具有更高的声压值，且在频谱上引起了其迁移频率的后移。Abstract: A turbulent boundary layer acoustic field of underwater vehicle is deduced with the large eddy simulation (LES) turbulent model and Lighthill′s acoustic analogy. The analysis shows that the transition zone of underwater vehicle has larger power spectral density than the development zone of underwater vehicle,the peak value of transition zone is in high frequency region, and the peak value of development zone is in low frequency region. The effect of velocity on spectrum of underwater vehicle is discussed. With velocity increasing the sound pressure of underwater vehicle rises, which causes the convective frequency moving back in the spectrum.
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Key words:
- underwater vehicle /
- flow noise /
- large eddy simulation (LES) /
- turbulent model /
- transition /
- convective frequency
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