摘要
利用一个 φ８ ｍｍ水听器和一个 ２０元阵在水洞中测量了湍流边界层起伏压力的点功率谱密度和波数频率谱密度。点功率谱密度测量结果的无量纲表示和 Ｂｕｌｌ Ｍ． Ｋ．等人风洞中的测量结果相吻合。波数频率谱的测量结果中能清楚地看到迁移峰，从而可进一步从迁移峰所在的位置求得迁移速度。同时还测量了一个接收面积为 １００ ｍｍ×６０ ｍｍ的 ＰＶＤＦ水听器对湍流边界层压力起伏的响应谱，将其结果和 φ８ ｍｍ水听器测量结果的对比，可以清楚看到 ＰＶＤＦ水听器对湍流边界层压力起伏的空间滤波作用。
The point power spectrum density and the wavenumber frequency spectrum density of turbulent-boundary- layer fluctuation pressure are measured by use of a φ8 mm hydrophone and a 20-element array, respectively. The non-dimensional representation of measured point power spectrum coincides with the measured results by Bull M. K. et al. in wind tunnel. The convection peak can be seen clearly in the measured wavenumber frequency spectrum and the convection velocity can be calculated from the location of the convection peak. The response spectrum of a PVDF hydrophone, which receive area is 100 mm ×60 mm, is also measured. By comparing it with the response spectrum of the φ8 mm hydrophone, it is shown that the PVDF hyrdophone has a strong wavenumber filtering effect on turbulent- boundary-layer pressure fluctuation.
出处
《声学学报》
EI
CSCD
北大核心
2000年第5期403-410,共8页
Acta Acustica
