论文部分内容阅读
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．
The cavitation flow characteristics of NACA16012 hydrofoil at 2 ° angle of attack were studied. During the transition from the steady state to the periodic low frequency pulsation and the development of the bubble flow, the frequency spectrum analysis of noise and low frequency vibration found that in the specific In the critical cavity number range, the cavitation flow state is no longer stable, but the periodic or quasi-periodic severe low frequency non-linearity pulsation, which is characterized by one characteristic frequency, appears. The pulsation frequency increases slightly with the increase of velocity. According to the characteristics of the total sound level of the cavitation noise band changing with the number of cavities, the range of the cavitation bubble flow can be judged.