A forced ignition probability analysis method using kernel formation analysis with turbulent transport and Lagrangian flame particle tracking  

作　　者：Qing XIE Zhuyin REN Ke WANG Hongjun LIN Shoutang SHANG Wei XIAO 

机构地区：[1]School of Aerospace Engineering,Tsinghua University,Beijing 100084,China [2]Institute for Aero Engine,Tsinghua University,Beijing 100084,China [3]Aero Engine Academy of China,Beijing 101300,China [4]AECC Shenyang Engine Research Institute,Shenyang 110000,China [5]AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412000,China

出　　处：《Chinese Journal of Aeronautics》2021年第4期403-415,共13页中国航空学报（英文版）

基　　金：the National Natural Science Foundation of China(No.91841302);National Major Science and Technology Project(No.2017-Ⅲ-0007-0032);Research Fund from Tsinghua University(No.2019Z08YJL03)。

摘　　要：A forced ignition probability analysis method is developed for turbulent combustion,in which kernel formation is analyzed with local kernel formation criteria,and flame propagation and stabilization are simulated with Lagrangian flame particle tracking.For kernel formation,the effect of turbulent scalar transport on flammability is modelled through the incorporation of turbulenceinduced diffusion in a spherically outwardly propagating flame kernel model.The dependence of flammability limits on turbulent intensities is tabulated and serves as the flammability criterion for kernel formation.For Lagrangian flame particle tracking,flame particles are tracked in a structured grid with flow fields being interpolated from a Computational Fluid Dynamics(CFD)solution.The particle velocity follows a Langevin model consisting of a linear drift and an isotropic diffusion term.The Karlovitz number is employed for the extinction criterion,which compares chemical and turbulent timescales.The integration of the above two-step analysis approach with non-reacting CFD is achieved through a general interpolation interface suitable for general unstructured CFD grids.The method is demonstrated for a methane/air bluff-body flame,in which flow and fuel/air mixing characteristics are extracted from a non-reacting simulation.Results show that the computed ignition probability map agrees qualitatively with experimental results.A reduction of the ignition probability in the recirculation zone and a high ignition probability on the shear layer of the recirculation zone near the mean stoichiometric surface are well captured.The tools can facilitate optimization of spark placement and offer insights into ignition processes.

关 键 词：Bluff-body stabilized flame Igniting process Ignition criterion Ignition probability Lagrangian particle tracking 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]