• 更多栏目

    刘宏升

    • 教授     博士生导师   硕士生导师
    • 主要任职:能源与动力学院副院长
    • 性别:男
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:能源与动力学院
    • 学科:工程热物理
    • 办公地点:能源与动力学院918房间
    • 联系方式:电话:0411-84706902 Email:lhsh@dlut.edu.cn
    • 电子邮箱:lhsh@dlut.edu.cn

    访问量:

    开通时间:..

    最后更新时间:..

    Large eddy simulation and proper orthogonal decomposition analysis of fuel injection under trans/supercritical conditions

    点击次数:

    论文类型:期刊论文

    第一作者:Wei, Wu

    合写作者:Liu, Hongsheng,Xie, Maozhao,Jia, Ming,Yue, Meng

    发表时间:2019-01-30

    发表刊物:COMPUTERS & FLUIDS

    收录刊物:SCIE、EI

    卷号:179

    页面范围:150-162

    ISSN号:0045-7930

    关键字:Supercritical injection; Density gradient; Disintegration process; POD

    摘要:Heptane jets with subcritical and supercritical inlet temperatures injected into a supercritical environment filled with multi-component gas have been numerically investigated using large eddy simulation. Main attentions are paid on the effects of density-gradient, thermodynamic and transport properties on the jet flow evolution. It is found that large density-gradients are easier formed in transcritical injection and the larger specific heat has an effect of forming the density gradients, while the diffusion coefficients decrease in the larger density gradient regions, suggesting that large density gradient has the effects of suppressing the flow diffusion mixing. In addition, when the fluid transits across the pseudo boiling temperature, the specific heat reaches a maximum value, yet this value is suppressed by the dissolution effects, indicating that multi-component injection is different from the single species injection and a special investigation is needed. The disintegration features in transcritical and supercritical injections are different, and thermodynamic and transport properties are crucial in the disintegration process. A proper orthogonal decomposition analysis indicates that the turbulent kinetic energy is larger and vortexes are more easily formed in the supercritical injection. The vortex movement and paring significantly affect in the jet mixing process. (C) 2018 Elsevier Ltd. All rights reserved.