摘要
离心泵内的压力脉动会导致泵体的振动,对其安全稳定运行产生危害.离心泵内压力脉动与振动的关系尚不清晰,因此本文对一台低比转速离心泵展开了实验研究,在蜗壳第Ⅱ断面外壁布置振动测点V,在其两侧沿圆周方向间隔36°依次布置P1、P2、P3三个压力脉动测点,其中P1与P2相对于测点V对称布置,同步采集压力脉动与振动信号,并在额定工况下进行相干分析。结果表明:压力脉动信号与泵体振动信号在各个基频处具有很强的相干性,可以认定造成离心泵低频振动的主因是离心泵内动静干涉和转子不平衡;通过对比相干系数发现,P1测点在各个主要基频处的相干性突出,P2测点相对较弱,而远离振动测点V的P3测点相较于接近振动测点V的P2测点其相干性更大。
The serious pressure pulsations in the centrifugal pump can directly cause the vibration, which is harmful to the safe and stable operation in the system. However, it is not clear that the relationships between the pressure pulsations and vibration has not been identified clearly. Thus, based on the correlation analysis method, this paper identifies the relationships under the rated condition. The vibration monitoring point V is mounted on the wall of the volute section II and three pressure pulsation monitoring points （P1, P2 and P3）are mounted on the two sides of vibration monitoring point V with 36~ interval at the circumferential direction. Moreover, monitoring points P1 and P2 are symmetrical arrangement related to point V. The pressure pulsations signals and vibration signals are measured synchronously, and coherent analysis is carried out under the rated condition. Research shows that the pressure fluctuation signals and vibration signals relatively similar in the centrifugal pump and it has a strong correlation in frequency domain distribution. Thus, it can be concluded that the main reason for low frequency vibration in the centrifugal pump is a strong interference effect. The experiment proves that far from vibration measuring point V, point P3 compared with point P2, which close to point V, the coherence is more weaker the coherence is. greater. More far away from the vibration source
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第1期87-91,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51576090)
江苏高校优势学科建设工程资助项目
关键词
离心泵
相干分析
压力脉动
振动
centrifugal pump
coherence analysis
pressure pulsation
vibration
