Influence of periodic disturbances on inception of cavitation in sharp-edged orifices
Influence of periodic disturbances on inception of cavitation in sharp-edged orifices
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DOI：
10.1007/s00348-002-0542-4
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发表时间：
2002-11
影响因子：
2.4
通讯作者：
K. Ramamurthi;S. Patnaik
中科院分区：
文献类型：
--
作者：
K. Ramamurthi;S. Patnaik
通过一系列实验，确定了周期性流动扰动对尖边孔板空化发生的影响。在流动中引入了不同的扰动幅度和频率。由附着流向空化流转变的空化参数阈值取决于扰动的幅度。扰动幅度越大，空化流动越自发。然而，观察到流动中的滞后现象有所减少。扰动频率的变化没有引起空化参数在转变时的任何显着变化。根据空化的可用停留时间和流体在尖边孔板和孔板上游管道中的特征停留时间对结果进行了解释。
The influence of periodic flow disturbances on the onset of cavitation in sharp-edged orifices was determined through a series of experiments. Different amplitudes and frequencies of disturbance were introduced in the flow. The threshold value of cavitation parameter for which transition from attached to cavitating flow took place was shown to depend on the amplitude of the disturbance. Cavitating flow was initiated more spontaneously as the amplitude of disturbance increased. Hysteresis in the flow was, however, observed to decrease. Variations in the frequency of the disturbance did not bring about any significant change in the cavitation parameter at transition. The results are interpreted in terms of the available dwell time for cavitation and the characteristic residence time of the fluid in the sharp-edged orifice and in the pipeline upstream of the orifice.