基于OpenFOAM的超临界压力下低温射流大涡模拟

李钰航; 吴宝元; 王祎; 周立新

doi:10.13224/j.cnki.jasp.20210244

基于OpenFOAM的超临界压力下低温射流大涡模拟

doi: 10.13224/j.cnki.jasp.20210244

1.
中国航天科技集团有限公司西安航天动力研究所液体火箭发动机技术重点实验室，西安 710100
2.
中国航天科技集团有限公司航天推进技术研究院，西安 710100

详细信息

作者简介:
李钰航（1993-），男，博士生，研究领域为液体火箭发动机喷雾燃烧。

中图分类号: V434.3
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- 文章访问数: 135
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-16
- 刊出日期: 2022-05-28

Large eddy simulation of cryogenic jet under supercritical pressure based on OpenFOAM

1.
National Key Laboratory of Science and Technology on Liquid Rocket Engines，Xi'an Aerospace Propulsion Institute，China Aerospace Science and Technology Corporation，Xi'an 710100，China
2.
Academy of Aerospace Propulsion Technology，China Aerospace Science and Technology Corporation，Xi'an 710100，China

摘要

摘要: 为了深入认识低温射流在超临界压力下的流动特性，将真实流体热物性模型写入开源CFD程序OpenFOAM平台中，开发出了用于模拟超临界压力下流动过程的均相求解器。针对液氮跨临界、超临界射流进行大涡模拟，研究了环境条件变化对于低温射流流动特性的影响。结果表明：采用的真实流体模型能够在广泛的温度与压力范围内准确计算流体的热物理性质，在此基础上开发的均相求解器能够准确描述超临界条件下的低温射流，其流动特性主要表现为稠密液体与环境气体之间的剪切层不稳定以及湍流混合，此类变密度射流在湍流充分发展区域同常密度射流一样具有自相似特性；超临界射流相比于跨临界射流具有更高的混合效率以及更短的液核穿透长度；环境温度升高以及环境压力降低均使得低温射流与周边气体之间的密度梯度增加，对剪切层中不稳定波动的发展起到抑制作用，导致了射流液核长度的增加以及扩张角度的减小。
- 超临界压力 /
- 真实流体模型 /
- 低温射流 /
- 均相求解器 /
- 大涡模拟 /
- 流动特征
Abstract: In order to get insights into the flow characteristics of cryogenic jet under supercritical pressure，the real-fluid model was implemented into open source CFD code OpenFOAM.The effect of real-fluid thermo-physical characteristics was introduced into the pressure correction algorithm，contributing to the development of the homogeneous solver for cryogenic flows under supercritical conditions.Transcritical and supercritical jets of LN₂ were studied using large eddy simulation，including the influence of ambient temperature and pressure.The results indicated that the real-fluid model developed can describe thermo-physical characteristics accurately within wide temperature and pressure range.The homogeneous solver can correctly reveal the flow structure of cryogenic jet under supercritical conditions，which was characterized by shear layer instability and turbulent mixing.These kinds of variable density jets showed self-similarity characteristics in turbulence fully developed region.Compared with transcritical jet，the supercritical jet showed higher turbulent mixing rate and shorter core length.Under higher ambient temperature or lower ambient pressure，the density gradient between cryogenic jet and ambient gas greatly reduced，which restrained the development of instability wave in shear layer，leading to the increase of jet core length and the decrease of jet spreading angle.
- supercritical pressure /
- real-fluid model /
- cryogenic jet /
- homogeneous solver /
- large eddy simulation /
- flow characteristic

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参考文献(24)

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