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水介质中曲面边界层转捩激励力特性高速水洞实验研究
Experimental study on the characteristics of boundary layer transition excitations on curved surface in a Large Cavitation Channel
【Author】 LIU Jian-hua;HUANG Hong-bo;LIU Zhu-qing;XU Ying-bo;YAN Kai;China Ship Science Research Center;Key Laboratory of Ship Vibration and Noise;Southern marine science and Engineering Guangdong laboratory(Zhanjiang);
【机构】 中国船舶科学研究中心; 船舶振动噪声重点实验室; 南方海洋科学与工程广东省实验室(湛江);
【摘要】 针对水下航行体在高航速下首部声纳自噪声激增的瓶颈问题,开展水介质中曲面边界层转捩激励力特性高速水洞实验研究。以SUBOFF标模为实验模型(长度4.3 m,最大直径508 mm),在大型低噪声循环水槽中开展壁面不同边界层流态所产生的激励力及辐射噪声实验测试。SUBOFF模型首部起沿流向平直安装PCB脉动压力传感器13支,实现模型表面脉动压力同步测试;在SUBOFF模型首部的正下方布置65元水听器声阵,实现SUBOFF模型首部辐射噪声实验测试;在SUBOFF模型内部不同流向站位处布置水听器1支,测试首部声纳区自噪声;同时,在SUBOFF模型内部支撑机构处布置振动加速度传感器,监测实验测试过程中的模型振动情况,以排除测试数据的外界干扰。在不同来流速度(1.5 m/s至12 m/s)下,实验雷诺数为Re_L=6×10~6~5×10~7,以脉动压力均方根激增以及脉动压力时域信号和频谱特征,作为压力测点处边界层转捩判据,着重分析了SUBOFF首部曲面边界层转捩区激励力特性,提出水下航行体首部流态控制以降低首部声纳区自噪声的流动控制思路。
【Abstract】 Aiming at the problem of self-noise intensive increase of the bow sonar of an underwater vehicle at high speed,the experimental study on the characteristics of boundary layer transition excitation force on curved surface in a Large Cavitation Channel(LCC) is carried out.Based on the SUBOFF model(length 4.3 m,maximum diameter 508 mm),the excitation force and radiation noise of different boundary layer flow on the model surface are tested in LCC.A row of 13 PCB pressure sensors are installed on the bow of the SUBOFF model along the flow direction for synchronous measurement of fluctuating pressure on the model surface,and the radiation noise is tested by an array of 65 microphones under the test section of LCC.At the same time,the vibration of the model is monitored.The Experimental Reynolds number was Re_L=6×10~6~5×10~7(U_∞=1.5 m/s~12 m/s).The time-domain signal and spectrum characteristics of fluctuating pressure are used as the boundary layer transition criterion.Based on the analysis of the characteristics of the excitation forces in the boundary layer transition region of SUBOFF bow surface,a flow control method is proposed to reduce the self-noise in the bow sonar region.
【Key words】 Boundary layer; Transition; Radiation noise; Fluctuating pressure; Self-noise;
- 【会议录名称】 第十六届全国水动力学学术会议暨第三十二届全国水动力学研讨会论文集(上册)
- 【会议名称】第十六届全国水动力学学术会议暨第三十二届全国水动力学研讨会
- 【会议时间】2021-10-30
- 【会议地点】中国江苏无锡
- 【分类号】O352
- 【主办单位】中国力学学会(Chinese Society of Theoretical and Applied Mechanics)、《水动力学研究与进展》编委会(Journal of Hydrodynamics Editorial Board)、中国造船工程学会(Chinese Society of Naval Architecture and Marine Engineering)、中国船舶科学研究中心(China Ship Scientific Research Center)