|Table of Contents|

Effect of inlet pressure on measurement of flow resistance coefficient of cavitating venturi(PDF)

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

Issue:
2019年02期
Page:
20-25
Research Field:
研究与设计
Publishing date:

Info

Title:
Effect of inlet pressure on measurement of flow resistance coefficient of cavitating venturi
Author(s):
HU Renzhong; LI Xiaoming; WANG Xin
(Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)
Keywords:
liquid rocket engine;  cavitating venturi;  inlet pressure;  flow resistance coefficient;  correction method
PACS:
V434.3
DOI:
-
Abstract:
The measured flow resistance coefficient of cavitating venturi is the direct basis for the performance calculation and adjustment of liquid rocket engine.Aiming at the problem that the inlet pressure of some cavitating venturis could not be pressurized to the rated value in liquid flow test, the analysis model of flow resistance coefficient was established and the effect of inlet pressure of cavitating venturi on the measurement of flow resistance coefficient was studied. The relationship between the flow resistance coefficient and the inlet pressure was obtained as well as the related correction formula.In addition, the five-stage pressure test method for measuring flow resistance coefficient was evaluated.The research results show that with the increase of inlet pressure, the throat equivalent circulation area of cavitating venturi decreases and the flow resistance coefficient increases.The flow resistance coefficient increases approximately linearly with the decrease of reciprocal inlet pressure.The deviation of flow resistance coefficient is different under the symmetrical pressure on both sides of the rated inlet pressure, and the deviation of flow resistance coefficient caused by inlet pressure decrease is greater than the deviation caused by inlet pressure increase.The flow resistance coefficient measured by the five-stage flow method is small, so the inlet pressure of the five-stage inlet pressure should be selected as close as possible to the rated inlet pressure or asymmetrically.When all inlet pressures are all lower than the rated inlet pressure in liquid flow test, the deviation can be effectively reduced by correcting the measured value of flow resistance coefficient.

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Last Update: 2019-04-30