When the pressure transients occur in low pressure pipelines such as the suction lines of pumps or the return lines of a hydraulic system , gas bubbles and cavitation will occur inside the fluid 当压力脉动发生在液压泵的吸油管路或液压系统的回油管路等低压管路中时,会引起气泡和气穴的产生及破灭。
In this paper , it is introduced to the influence of cavitation factor , measurement taps , sampling frequency and sampling time on the test result in pressure fluctuation test of the water turbine 摘要介绍了水轮机压力脉动试验时空化系数、测量位置及测点、信号采样频率及采样时间等因素对试验结果的影响。
The air - volume which is traditionally installed as a buffer in the piping system to reduce the pressure oscillation and ensure the system working in reliable environment 因此，传统研究方向是在管道系统中安设空气室作为管道系统的缓冲器。实践证明，它能有效地消减管道中的压力脉动，保证管道系统安全运行。
The growing and collapsing of gas bubbles and cavitation not only damage the flow continuity and reduce the working mediums physical performance , but also influence the propagation of pressure pulsation 气泡和气穴的产生及破灭不仅破坏了流体的连续性、降低了介质的物理特性,而且还会影响压力脉动波的传播过程。
The fluid pressure pulse in seawater piping system can cause flow - noise that badly affect the environment and worker in health , even lead to deterioration in operation security of piping system 海水管路系统流体压力脉动及其引起的流噪声对环境及人员的身体健康有许多不良影响，也会降低管路系统自身工作可靠性。
3 . the results of model test were analyzed . it is concluded that the performance of the model turbine is satisfying , with press pulsation on some operation point exception 西安理工大学工程硕士学位论文3 、通过对模型验收试验的结果进行详细的分析，结果显示除部分工况点的压力脉动值外，模型转轮的各项性能满足合同要求。
The pressure oscillation in piping system can lower the efficiency of the pump , cause the additional consume of energy and emit noise , deteriorate the working condition of the accessory 管道系统中的压力脉动会对管道系统中造成许多危害，例如它会降低泵的工作效率、增加额外的能耗、产生噪声，使管道附件的工况变坏和造成管道振动等等。
To eliminate pressure oscillations , variables are stored in a staggered grid system . solving n - s equation with simple arithmetic , calculate the internal flow of 3 - d incompressible in the channel nonclogging pump . 6 为消除齿形压力脉动，采用交错网格存放变量，用simple算法求解n - s方程，对无堵塞泵叶轮内部三维不可压湍流场进行数值模拟； 6
At same time , author suggests to change cavitation factor to important operation condition during pressure fluctuation test so to avoid producing the phenomenon of cavitation stimulus in the prototype operation 同时，建议针对水轮机的重要运行工况，增加不同空化系数下的压力脉动试验，以避免在真机运行时可能产生“空化自激”现象，确保原型机组的安全运行。
Therefore , the study of the fluid transient accompanying the growing and collapsing of gas bubbles and cavitation in low pressure hydraulic pipelines is absolutely important for the prediction of the hydraulic pump performance and the safety of hydraulic system 因此,研究低压液压管路有气泡和气穴产生的瞬态压力脉动过程,对于液压泵的流量特性预测以及液压系统的正常工作有着重要的意义。
