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为了定量分析鱼雷出管后形成的瞬态射流噪声在总的发射噪声中的贡献程度,采用计算流体力学和计算声学相结合的混合模拟方法对两种速度下的定常射流噪声进行了预报和分析.射流噪声模拟时考虑艇体壁面限定影响,湍流涡捕捉采用大涡模拟方法,声传播计算采用边界元数值声学方法.结果表明:射流束集中穿过艇体壁面上的防波板出口,仅有少数流体在发射水舱内折转涌动;艇体壁面存在破坏了发射水舱内射流束与周围流体之间剪切层的形成,艇体壁面外湍流涡结构与射流混合区理论形状一致;射流噪声主要贡献频带位于100Hz以内和300Hz~1kHz范围内,且以低频段为主;偏离射流轴向方向时,辐射噪声显著减小;电磁式鱼雷发射装置的声学优化空间显著.
In order to quantitatively analyze the contribution of transient jet noise formed by the torpedo tube to the total emission noise, a hybrid simulation method combining computational fluid dynamics and computational acoustics was used to predict and analyze the steady jet noise at two speeds The influence of the boundary of the hull wall is considered in the jet noise simulation, the large eddy simulation method is used to capture the turbulent eddy currents, and the boundary acoustic acoustic method is used to calculate the acoustic propagation.The results show that the jet flows concentratedly through the anti-wave plate outlet on the hull wall, A small number of fluid surged in the launching tank; the existence of the hull wall undermined the formation of shear layer between the jet stream and the surrounding fluid in the launching tank, and the turbulent eddy structure outside the hull surface was in agreement with the theoretical shape of the jet mixing zone The main contribution frequency band of jet noise lies in the range of 100Hz and 300Hz ~ 1kHz, and is dominated by low frequency band. The radiated noise is significantly reduced when it deviates from the axial direction of jet. The acoustic optimization space of electromagnetic torpedo launcher is significant.