|Table of Contents|

Influence of ring clearance on the performance of two-stage high-speed centrifugal pumps(PDF)

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

Issue:
2023年05期
Page:
66-72
Research Field:
目次
Publishing date:

Info

Title:
Influence of ring clearance on the performance of two-stage high-speed centrifugal pumps
Author(s):
ZHOU Zhihua;  WANG Haoming;  WANG Yuanding;  LI Xiaofang;  LIN Qingguo
(Shanghai Engineering Research Center of Space Engine,Shanghai Institute of Space Propulsion, Shanghai 201112, China)
Keywords:
high-speed centrifugal pump;  ring clearance;  leakage loss;  friction loss;  pump efficiency
PACS:
V434.2
DOI:
-
Abstract:
In order to explore the impacts of ring clearance on the performance of centrifugal pumps, a two-stage low specific speed centrifugal pump with high speed is chosen as the research object. The hydraulic performance of the prototype and improved scheme with decreased ring clearance are measured at multiple operation points, the test results of these two schemes are compared, and the influences of wear ring clearance on the leakage loss and friction loss are analyzed by experiments and empirical formula calculations. As a result, the reduction of ring clearance can effectively enhance the head and efficiency of centrifugal pumps, and the pump efficiency of the improved scheme is increased by 5%. In the range of measurement conditions at the designed speed, with the increase of the flow, the head coefficient of the prototype gradually decreases, while the change of the improved scheme is not obvious. The decrease in the head coefficient makes the change in the calculated leakage loss ratio more obvious. Although the friction loss is higher with a smaller ring clearance, reducing the ring clearance is an available approach to improve the pump performance which reduces the leakage loss remarkably.

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