离心泵非设计工况空化振动噪声的试验测试

Experimental testing on cavitation vibration and noise of centrifugal pumps under off-design conditions

在离心泵闭式试验台上,基于虚拟仪器数据采集系统和泵产品测试系统建立了离心泵空化诱导振动噪声的试验测试系统,实现了泵性能参数和空化诱导振动噪声信号的同步采集。以一台单级单吸离心泵为研究对象,测量了模型泵在不同流量下,空化余量(NPSH)变化时的振动和噪声信号并对其进行了处理,得到了不同流量下振动加速度和噪声声压级随NPSH变化的曲线图。试验结果表明:不同流量下,随NPSH的下降,振动加速度和声压级先保持不变然后明显升高,据此可以初步判断泵的初生空化余量;泵体的振动强度高于其他测点;除轴向振动变化规律复杂外,其余测点随着流量的增加振动加强。

Based on virtual instrument data acquisition system and pump product testing system,cavitation induced vibration and noise testing system was established in the centrifugal pump closed experimental rig,and the synchronous acquisition of pump performance parameters and cavitation induced vibration and noise signal were realized.With a single grade end suction pump as research model,whose vibration and noise signal at design and off-design conditions under different net positive suction head were measured and processed,the curves of vibration acceleration and noise level versus different net positive suction head were obtained.Experimental results showed that：as the cavitation intensified,vibration acceleration and noise stabilized at first and then increased apparently,which could be used to decide the inception net positive suction head;The vibration strength of pump volute was higher than that of other measure points.In addition to the complicated changing regularity of axial vibration,the vibration of other measure points augmented with the increase of flow.