|Table of Contents|

Simulation study on ejection performance of ramjet engine wind tunnel ejector(PDF)

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

Issue:
2019年02期
Page:
53-59
Research Field:
研究与设计
Publishing date:

Info

Title:
Simulation study on ejection performance of ramjet engine wind tunnel ejector
Author(s):
ZHOU Jingying;  ZOU Weilong;  HUANG Lihuan
(Xi'an Aerospace Dynamic Test Technology Institute,Xi'an 710100, China)
Keywords:
steam ejector;  ejection performance;  working condition parameters;  numerical simulation;  ejection coefficient
PACS:
V211
DOI:
-
Abstract:
Steam ejector is an important equipment used in ramjet test-bed to achieve high vacuum.Its working environment is complex and thus its performance optimization is difficult.The model of steam ejector was simplified and established.The working condition of ejector was simulated by Fluent software.The change of flow field in the ejector under working condition was analyzed.The method of control variable was used to analyze the influence of working condition parameters such as water vapor content, working fluid pressure and ejector fluid pressure on ejector's working ability.The reliability of the simulation results was verified by comparing with the experimental data.The results show that the ejector efficiency increases with the increase of the flow rate of the ejector fluid, and the ejection coefficient decreases from 0.45 to 0.36 when the percentage of water vapor in the ejector fluid changes from 0 to 50%.When the inlet pressure of the working fluid rises from 1.07 MPa to 1.42 MPa, the ejection coefficient decreases from 0.41 to 0.33; when the inlet pressure of the ejecting fluid rises from 12 kPa to 54 kPa, the ejection coefficient rises from 0.12 to 0.43.So the influence of the two inlet pressures should be comprehensively considered in the optimization design.

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Last Update: 2019-04-30