ON ACOUSTIC PERFORMANCE OF MEASURING STRUCTURE FOR CAVITATION NOISE

作     者：Wu, Jian-hua Chai, Gong-chun Wang, He-sheng 

作者机构：Nanjing Hydraulic Research Inst Nanjing China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：1991年第3卷第2期

页      面：42-50页

核心收录：

学科分类：080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

主　　题：Acoustic Waves Transmission Glass Acoustic Properties Hydrodynamics Fluid Structure Interaction Polyethylenes Acoustic Properties Water Waves 

摘      要：The acoustic performance of the structure for measuring cavitation noise is theoretically analysed, and two judging criteria of the acoustic performance of STW (sound transmission window) are presented in this paper. One is of impedance matching between working liquid and STW:ρ1C1 = ρ2C2. The other is of maximum frequency (or minimum wave length) of cavitation noise spectrum: fmax&le c/60D (or λmin/D ≥ 60). If either of the criteria is met reliable measured results of cavitation noise will be obtained. The theoretical results are verified through experiments. According to the criteria, the paper analyses the acoustic performance of routinely used plexiglass STW. The results show that in the research of clear water cavitation the impedance ratio, 2. 18, does not satisfy ρ1C1 = ρ2C2, and fmax&le C/60D hardly holds for actual cavitation noise spectrum. Therefore, plexiglass STW is not good enough for sound transmission. From this point of view, polyethylene is better sound transmission material than plexiglass.