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The wall pressure fluctuation of the turbulent boundary layer (TBL) is a primary source of flow-induced vibration noise. Due to their broadband and highly chaotic features, it is difficult to accurately capture the complex spatio-temporal variations of the phenomenon. To analyze these intricate characteristics, the wavenumber-frequency spectrum is needed. And both experimental and theoretical modeling in this field have become critical research topics. This paper investigated the convection velocity characteristics of the TBL wall pressure fluctuations wavenumber-frequency spectrum. In the low-speed wind tunnel experiments a linear array of pressure sensors was used to measure TBL wall pressure fluctuations. The cross-spectral matrix (CSM) method was adopted to derive the wavenumber-frequency spectrum, obtaining the convection velocity at various wind speeds. Concurrently, hot-wire anemometer measurements were made for boundary layer parameters, which were normalized to analyze convection velocity characteristics. The new convection velocity prediction model was developed and applied to the classical Chase I wavenumber-frequency spectrum model. Comparisons with experimental data showed strong agreement between the convection ridge in Chase I model and measurements, validating the new model’s broad applicability across wind speeds and frequencies. This study provides new theoretical insights and technical pathways for TBL wall-pressure wavenumber-frequency spectrum modeling and ship noise control technology.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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