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Experimental study on the spray and flame of hypergolic bipropellants in hot-fire test(PDF)

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

Issue:
2019年04期
Page:
26-31
Research Field:
研究与设计
Publishing date:

Info

Title:
Experimental study on the spray and flame of hypergolic bipropellants in hot-fire test
Author(s):
XIA Yizhi; YANG Weidong; WANG Yong; HONG Liu
(Science and Technology on Liquid Rocket Engine Laboratory,Xi’an Aerospace Propulsion Institute,Xi’an 710100,China)
Keywords:
bipropellants;  hypergolic;  unlike-impinging injector;  spray;  combustion
PACS:
V434.3
DOI:
-
Abstract:
In order to study the detailed spray and combustion characteristic of hypergolic bipropellants utilizing unlike-impinging injector,experimental study was conducted to investigate the phenomena involved in the spray and combustion processes of neat methylhydrazine/nitrogen tetroxide(MMH/NTO)in a visualized combustion chamber.High-speed camera was used to record the natural flame luminosity firstly,then high-speed camera and back illumination light extinction was combined to record the spray images in hot-fire test.The results show that liquid propellants visible are mainly distributed in injection/atomization zone which is near the injector,and the area of injection/atomization zone increase with the increasing of fuel jet velocity.The distance from ignition position to injector face and flame propagation velocity also increase with the increasing of fuel jet velocity.Judging from the flame luminosity,the flame of MMH/NTO could be divided into outer flame,inner flame and flame core with highest brishtness.The area of flame core decrease firstly and then increase with the increasing of fuel jet velocity.The induction length and angle of flame increase with the increasing of fuel jet velocity as well as the injection/atomization zone.

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Last Update: 2019-08-31