本征正交分解法对正十二烷喷雾射流的解析

秦文瑾; 徐礼辉; 卢登标; 刘浩

doi:10.13224/j.cnki.jasp.20200500

本征正交分解法对正十二烷喷雾射流的解析

doi: 10.13224/j.cnki.jasp.20200500

1.
上海理工大学机械工程学院，上海 200093
2.
中国航天科技集团有限公司中国运载火箭技术研究院北京航天计量测试技术研究所，北京 100076

基金项目: 国家自然科学基金（51506118）

详细信息

作者简介:
秦文瑾（1981-），男，副教授、硕士生导师，博士，主要从事先进燃烧技术研究。

中图分类号: V231.2+1
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出版历程
- 收稿日期: 2020-11-22
- 刊出日期: 2021-09-28

Analysis of n-dodecane spray jet by proper orthogonal decomposition

1.
School of Mechanical Engineering， University of Shanghai for Science and Technology，Shanghai 200093，China
2.
Beijing Aerospace Institute for Metrology and Measurement Technology， China Academy of Launch Vehicle Technology， China Aerospace Science and Technology Corporation，Beijing 100076，China

摘要

摘要: 应用大涡模拟方法对航空煤油单组分替代燃料正十二烷冷态喷雾现象进行模拟计算，探究喷雾射流中的多物理场耦合现象。从宏观层面分析燃油破碎蒸发及油气混合过程，发现流场涡团在其中起着重要的作用。运用本征正交分解方法对正十二烷射流质量分数场和涡量场数据库进行加工，从“微观”层面深入探究两者的联系。结果表明：正十二烷质量分数场喷雾结构与射流涡量场涡团结构存在显著的空间分布相关性，反应出两者结构演变具有重要关联特征。湍流脉动致使涡团尺度发生变化，从而影响燃油破碎蒸发，最终使得喷雾不同尺度结构分布形态发生改变。
- 大涡模拟 /
- 本征正交分解（POD） /
- 正十二烷 /
- 喷雾射流 /
- 湍流脉动
Abstract: Large eddy simulation was used to calculate the cold spray phenomenon of single component alternative fuel n-dodecane for aviation kerosene，and to explore the coupling phenomenon of multiple physical fields in spray jets.The process of fuel breaking，evaporation and oil-gas mixing was analyzed from the macro level，and it was found that the flow field vortices played an important role in the process.The data base of mass fraction field and vorticity field of n-dodecane jet flow was processed by the proper orthogonal decomposition，and the relationship between them was explored from the micro level.The results showed that there was a significant spatial distribution correlation between the n-dodecane mass fraction field spray structure and the jet flow vorticity field vortex structure，reflecting that the evolution of two structures had important correlation characteristics.The turbulence fluctuation resulted in the change of the vortex scale，which affected the breakup and evaporation of the fuel，and finally changed the distribution morphologies of different scale structures of spray.
- large eddy simulation /
- proper orthogonal decomposition（POD） /
- n-dodecane /
- spray jet flow /
- turbulence fluctuation

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