|Table of Contents|

Start-up characteristics of low-thrust space liquid rocket engine with entrained gas(PDF)

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

Issue:
2021年03期
Page:
8-15
Research Field:
研究与设计
Publishing date:

Info

Title:
Start-up characteristics of low-thrust space liquid rocket engine with entrained gas
Author(s):
LIU Changguo1; 2; 3; CHEN Ruida2; 3; LIU Ben2; 3; XU Hui2; 3; YU Daren1
1.School of Energy,Harbin Institute of Technology,Harbin 150001,China; 2.Shanghai Institute of Space Propulsion,Shanghai 201112,China; 3.Shanghai Engineering Research Center of Space Engine,Shanghai 201112,China
Keywords:
gas entrainment;  start-up process;  injector;  atomization;  cut-off
PACS:
V434.3
DOI:
-
Abstract:
In order to explore the effect of gas entrainment in the supply pipelines during the liquid rocket engine start-up process,the atomization characteristics of 150 N bipropellant engine impinging injector were captured by the color high-speed camera.The start-up processes of spray field under the gas-entrained and non-gas-entrained states were compared.The first domestic verification test of low-thrust space liquid rocket engine start-up with entrained gas was carried out in the high altitude simulation hot fire test bench.The propellant supply pipelines in the vacuum cabin were directly filled after nitrogen blowing,and then the engine was ignited.The results show that the injector spray field distribution with gas entrainment is mainly concentrated in the central axis area,and the local area atomization effect is enhanced.In addition,the droplet diameter decreases and the atomization cone angle increases.When the atomization with gas entrainment is fully developed,the initial section of the central main jet and the side jets will be locally cut off,and the overall distribution uniformity of the injector spray field is poor.Under the hot fire test conditions,there is no continuous oscillation during the engine start-up process due to the gas entrainment,the engine ignition thrust peak tends to increase,and other measurement parameters including performance,temperature,vibration and start-up and shutdown process of the engine do not change significantly.However,the gas entrainment may increase the complexity and uncertainly of the engine start-up process,and enough attention needs to be paid in engineering application.It's strongly recommended to add a 3-second pre-ignition program during the hot fire test to discharge the bubbles before the control valves after propellant filling,and to continue the subsequent ignition procedure of the engine after confirming that there is no abnormality during the start-up process.

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