水下开口腔体流激振动实验与仿真研究  

Flow-excited Vibration Test and Simulation Analysis of an Underwater Open Cavity

作　　者：邵优华[1] 田锦[2] 黄修长[2] SHAO You-hua;TIAN Jin;HUANG Xiu-chang(Naval Representative Office of Shipboard Gun, Shanghai 200135, China;Institute of Vibration, Shock and Noise, Shanghai Jiaotong University, Shanghai 200240, China)

机构地区：[1]海军驻上海地区舰炮系统军事代表室,上海200135 [2]上海交通大学振动冲击噪声研究所,上海200240

出　　处：《噪声与振动控制》2017年第4期57-62,共6页Noise and Vibration Control

摘　　要：采用实验与数值计算相结合的方法,研究流体流经开口腔时在开口处的压力脉动规律,以及开口腔在压力脉动作用下的振动特性。研究的内容主要有:通过实验和有限元/边界元方法获得开口腔模型在空气中和水中的模态振型以及频率;在开口腔的孔口后缘10毫米处布置一个压力传感器来测量流速对涡脱落频率的影响,通过开闭孔口的方式确认涡脱落的频率分量;使用大涡模拟计算得到不同流速条件下压力传感器对应位置的压力脉动规律,并与实验结果进行比较验证;在开口腔体侧面布置一个加速度传感器来测量不同流速条件下腔体结构振动情况;以CFD计算得到的压力脉动为输入,使用有限元/边界元方法计算得到加速度传感器对应位置处的加速度值,并与实验结果进行对比分析。The flow-induced pressure fluctuation and vibration response of an underwater open cavity are studied.Experimental and numerical methods are used to investigate the related characteristics.The primary work includes:(1)the modal characteristics of the open cavity in air and in water are obtained using experimental method and FEM/BEM;(2)a pressure transducer is flush mounted on the upper wall of the open cavity to measure the pressure fluctuations behind the downstream edge of the orifice,meanwhile a large eddy simulation(LES)is conducted to obtain the pressure fluctuations in the same location as the pressure transducer,the results are compared with those of the test;(3)accelerometers are mounted on the side walls of the open cavity to investigate the vibration response under different free stream velocities;FEM/BEM is used to calculate the vibration response of the open cavity,the results are compared with those of the test.

关 键 词：振动与波 流激振动 开口腔体 大涡模拟 振动测量 湿模态测量 

分 类 号：O42[理学—声学]