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Simulation on underwater ignition process and its influencing factors(PDF)

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

Issue:
2022年05期
Page:
76-83
Research Field:
目次
Publishing date:

Info

Title:
Simulation on underwater ignition process and its influencing factors
Author(s):
LIU Wenjie;  LI Dong;  CAI Qiang;  LI Xiang;  ZHANG Zheng
(China Academy of Launch Vehicle Technology, Beijing 100076, China)
Keywords:
underwater ignition gas jet ignition depth velocity vaporization
PACS:
V435
DOI:
-
Abstract:
The flow field characteristics of underwater ignition are completely different from ignition in the air and are very sensitive to the underwater working environment.In order to study the unsteady development process of underwater ignition and the influence law of various factors(such as depth, velocity, vaporization), a variety of underwater ignition conditions were studied by numerical simulation, utilizing the VOF multiphase model and SST k-ω turbulence model.The results show that, the process of underwater ignition can be divided into three stages: initial stage, oscillatory stage and stable stage.In the stable stage, the gas bubble can be divided into jet region, transition region and mixing region, and the division of different stages is affected by depth, velocity and so on.Oscillation is the most important characteristic in the working process.The working state of gas jet determines the characteristics of flow field and thrust.Velocity mainly affects the evolution law of gas bubble shape, which shows that the axial length and necking degree increases.Due to the influence of vaporization effect, the phenomenon of water vapor accumulation appears in the flow field, but the influence on the flow field and engine thrust are not significant due to the short interaction time and small amount of vapor.

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