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水下排气噪声是一些水下武器的主要噪声源之一,其排放系统管路的喷口参数对喷气产生的辐射噪声有重要影响,特别是对喷口附近气液两相流动产生的噪声有较大影响。为了研究不同喷口结构对水下喷射流场形态和辐射噪声特性的影响,本文对3种不同直径喷管进行多种工况下的水下喷气噪声试验,并观测了喷气形成的两相流场,研究发现在射流状态下喷管直径对空穴大小影响较大;流场形态由气泡流态转化为射流流态后,中高频段内的声压非线性增大;相同的射流韦伯数下,小直径的喷管能够抑制气泡噪声的产生。
Underwater exhaust noise is one of the main noise sources of underwater weapons. The discharge port parameters of the discharge system piping have an important influence on the radiated noise generated by the jet, especially on the gas-liquid two-phase flow near the discharge port Great influence. In order to study the influence of different nozzle structures on the shape and radiated noise characteristics of the underwater jet flow field, underwater jet noise experiments under different working conditions were carried out for three different nozzle diameters and the two-phase flow field The results show that the nozzle diameter greatly affects the hole size in the jet state. After the flow field changes from bubble flow to jet flow, the sound pressure in the middle and high frequency band increases nonlinearly. The same jet Weber number , Small diameter nozzle can inhibit the bubble noise generation.