A Study on the Cavitation and Pressure Pulsation Characteristics in the Impeller of an LNG Submerged Pump

Machines

Yang Yang¹  Weidong Shi²  Ramesh K. Agarwal³  Muhammad Awais⁴  Xiaofan Zhao⁴  Wei Li⁴  Shuo Li⁴  Leilei Ji⁴ 

[1] College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China;College of Mechanical Engineering, Nantong University, Nantong 226019, China;Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO 63130, USA;National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China;

关键词: LNG submerged pump;    numerical calculation;    cavitation;    pressure pulsation;   

DOI  :  10.3390/machines10010014

来源: DOAJ

【 摘 要 】

Based on CFD analysis technology, this paper studies the cavitation performance of an LNG submerged pump and the pressure pulsation characteristics under cavitation excitation. The variation laws of the waveform, amplitude and frequency of the pressure pulsation in the impeller of the LNG submerged pump under different flow rates and NPSH_a are also analysed. By calculating the root mean square of the pressure coefficient of the low-frequency pulsation, the influence of the aggravation process of cavitation on the low-frequency pulsation in the LNG submerged pump is quantitatively analysed, and the characteristics of the pressure pulsation in the LNG submerged pump under the cavitation condition are revealed. The results show that with the increase in flow rate, the pressure pulsation in the impeller becomes stronger, periodically, and the amplitude decreases. The influence of cavitation on the pressure pulsation in the primary impeller is greater than that in the secondary impeller. When critical cavitation occurs, the low-frequency signal amplitude of pressure pulsation in the primary impeller increases and exceeds the blade frequency, becoming the main frequency.

【 授权许可】

Unknown