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    魏杰立

    • 副教授 硕士生导师
    • 招生学科专业:
      能源动力 -- 【招收硕士研究生】 -- 能源与动力学院
    • 性别:男
    • 毕业院校:南京航空航天大学
    • 学历:博士研究生毕业
    • 学位:工学博士学位
    • 所在单位:能源与动力学院
    • 办公地点:明故宫校区A10-524
    • 电子邮箱:

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    Statistics and dynamics of instantaneous leading point in nonpremixed bluff-body flames

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    DOI码:10.2514/1.J061156

    发表刊物:AIAA Journal

    摘要:The subtle flow-flame interaction is essential for flame stabilization in propulsion and power systems. In this study, the flamelet/progress variable (FPV) approach combined with large eddy simulation (LES) is employed to simulate the Sydney non-premixed bluff-body flame, HM1E, for which the leading point concept is employed to reveal the complex flow-flame interaction. The Eulerian data as well as the leading point tracked data are analyzed. The Eulerian data shows that compositional structure at axial location x/Db ranging from 0.5 to 1.0 has two branches, unburnt branch and burning branch. To reveal the underlying physics of the compositional structure, the statistics of leading point is analyzed and show that there are Gaussian-like and non-Gaussian probability density function (PDF) distributions upstream and downstream of about x/Db = 0.5. Further analysis of the flow-leading point interaction shows the region of x/Db ranging from 0.25 and 0.5 is where the instability of the outer shear layer occurs. Two different interaction patterns exist upstream and downstream of x/Db = 0.5 corresponding to Gaussian-like and non-Gaussian PDFs, respectively. The core and braid structures developed in the shear layer downstream of x/Db = 0.5 are responsible for the non-Gaussian PDF. In addition, the leading point migration in streamwise direction leads to the exhibition of two-branch compositional structure for Eulerian data.

    论文类型:期刊论文

    卷号:60

    期号:5

    页面范围:3324-3336

    是否译文:

    发表时间:2021-12-22

    收录刊物:SCI

    合写作者:Yao Min,Ren Zhuyin

    通讯作者:Zhang Jian