Cavitation in centrifugal pump with rotating walls of axial inlet device

15th International Scientific and Engineering Conference Hermetic Sealing, Vibration Reliability and Ecological Safety of Pump and Compressor Machinery HERVICON+PUMPS-2017

机械制造;生态环境科学

Moloshnyi, O.^1 ; Sotnyk, M.^1

Applied Hydro- and Aeromechanics Department, Faculty of Technical Systems and Energy Efficient Technologies, Sumy State University, Sumy

40007, Ukraine^1

关键词: Absolute pressure;    Cavitation characteristics;    Cavitation performance;    Flow rate changes;    Numerical experiments;    Operating process;    Software environments;    Sudden expansion;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/233/1/012007/pdf
DOI  :  10.1088/1757-899X/233/1/012007

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The article deals with the analysis of cavitation processes in the flowing part of the double entry centrifugal pump. The analysis is conducted using numerical modeling of the centrifugal pump operating process in the software environment ANSYS CFX. Two models of the axial inlet device is researched. It is shaped by a cylindrical section and diffuser section in front of the impeller, which includes fairing. The walls of the axial inlet device rotate with the same speed as the pump rotor. The numerical experiment is conducted under the condition of the flow rate change and absolute pressure at the inlet. The analysis shows that the pump has the average statistical cavitation performance. The occurrence of the cavitation in the axial inlet device is after narrowing the cross-section of flow channel and at the beginning of the diffuser section. Additional sudden expansion at the outlet of the axial inlet diffuser section does not affect the cavitation characteristics of the impeller, however, improves cavitation characteristics of the axial inlet device. For considered geometric parameters of the axial inlet device the cavitation in the impeller begins earlier than in the axial inlet device. That is, the considered design of the axial inlet device will not be subjected to destruction at the ensuring operation without cavitation in the impeller.