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Analysis on characteristics of self-excited cavitation oscillation in pump-piping system(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2015年05期
Page:
29-33
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis on characteristics of self-excited cavitation oscillation in pump-piping system
Author(s):
YAN Junfeng;  CHEN Hui;  LU Wanruo
Xi’an Aerospace Propulsion Institute, Xi’an 710100, China
Keywords:
centrifugal pump;  piping system;  self-excited cavitation oscillation;  dynamic characteristic;  limit cycle
PACS:
V434-34
DOI:
-
Abstract:
The low frequency oscillation of inlet pressure and outlet pressure occurred in an inducer-centrifugal pump test when flow in the pump was small, which contrasts with the frequency characteristics of high speed centrifugal pump. This indicates that the self-excited oscillation occurs in the pump-piping system. When the pump is operating at off-design conditions, the backflow zone intensively interacting with main flow zone may appear. This backflow is rotated with the inducer, which will decrease the static pressure of the mainstream liquid and result in a periodical change of the physalides volume, and then the self-excited cavitation oscillation occurs. In order to analyze the characteristics of the self-excited cavitation oscillation, a novel cavitation dynamic model is presented to simulate the dynamic characteristic to capture the oscillation frequency in the pump-piping system, the dynamic characteristics of inlet pressure and flow rate, and the limit cycle of flow rate versus inlet pressure. The results of numerical experiments indicate that the calculated characteristics of self-excited cavitation oscillation is consistent with experimental result, this cavitation self-excited mathematic model is suitable to simulate the characteristics of the self-excited cavitation oscillation. The oscillation frequency increases with decrease of the pump speed and the length of inlet piping, while the oscillation frequency decreases with decrease of the inlet pressure and the flow rate.

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Last Update: 1900-01-01