摘要
对ＮＡＣＡ１６０１２水翼在２°攻角下的空泡流特性进行了研究，在空泡流处于由稳态向周期低频脉动过渡和发展的过程中，通过噪声与低频振动的频谱分析，发现在特定的临界空泡数范围内，空泡流态不再保持稳定，而出现由某一个特征频率所表征的周期或准周期剧烈非线性低频脉动，脉动频率随速度的增加而略有增长．根据空泡噪声频带总声级随空泡数变化的特征，可以判断跨空泡流发生的范围．
Cavitating flow of NACA16012 hydrofoil at 2° is studied. In the evolution of cavitating flow from steady state to lowfrequency oscillation and by means of noise and vibration measurements, it is found out that the whole cavitating flow system at a certain cavitation number no longer keeps steady but oscillates periodically or quasiperiodically with an eigenfrequency that rises slightly with the increasing velocity. According to the feature of total acoustic level variation in cavitation noise with cavitation number, a critical range of cavitation number can be found.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
1998年第8期86-92,共7页
Journal of Shanghai Jiaotong University
关键词
空泡流
非稳定性
低频振动
船舶
水翼
周期
cavitating flow
instability
lowfrequency oscillation
noise
