水下航行器流噪声特性水洞试验研究

摘要

The flow-noise experiments of underwater vehicle were conducted in the NWPU high speed water-tunnel. The flow-noise sound pressure spectrum characteristics of different underwater vehicle models were tested at different flow velocities and different testing point positions.The experimental results and their analysis show prelim-inarily that:(1) the flow-noise of underwater vehicle models was significantly influenced by fore-body linetype, flow velocities and testing point positions;( 2) the flow-noise sound pressure level was smaller when the front-sec-tion diameter of fore-body was smaller and the length of fore-body was longer, the flow-noise sound pressure level increased with increasing flow velocity.(3) compared with other positions of the front-section,the flow-noise sound pressure level of the stagnation point was smallest.The flow-noise sound pressure spectra of large scale underwater vehicle were estimated with scaling law and better estimation value was obtained.We believe that the research re-sults in this paper are helpful in the acoustic design of underwater vehicle.%在高速水洞中进行了水下航行器流噪声的试验研究，测量了不同头部线型、不同来流速度、不同测试点位置处水下航行器缩比模型的流噪声声压谱特性。试验结果发现，上述因素对模型流噪声均有显著影响：模型头部端面直径越小，头部曲线段越长，其流噪声声压级越小；流噪声声压级随着来流速度的增大而增大；相比头部端面其他位置，驻点处的流噪声声压级最小。同时，运用相似率估算了大尺度航行器的流噪声声压谱，获得了较好的预测值。该研究成果对水下航行器的声学设计具有一定的指导意义。