We propose a new flame index for the transported probability density function(PDF)method.The flame index uses mixing flux projections of Lagrangian particles on mixture fraction and progress variable di-rections as the metrics to identify the combustion mode,with the Burke-Schumann solution as a refer-ence.A priori validation of the flame index is conducted with a series of constructed turbulent partially premixed reactors.It indicates that the proposed flame index is able to identify the combustion mode based on the subgrid mixing information.The flame index is then applied the large eddy simulation/PDF datasets of turbulent partially premixed jet flames.Results show that the flame index separate differ-ent combustion modes and extinction correctly.The proposed flame index provides a promising tool to analyze and model the partially premixed flames adaptively.

Zhen Lu;Hua Zhou;Zhuyin Ren;Yue Yang;Hong G.Im

State Key Laboratory for Turbulent and Complex Systems,College of Engineering,Peking University,Beijing 100871,China;BIC-ESAT,Peking University,Beijing 100871,China;Clean Combustion Research Center,King Abdullah University of Science and Technology,Thuwal 23955-6900,Saudi Arabia;Institute of Aero Engine,Tsinghua University,Beijing 100084,China;HEDPS-CAPT,Peking University,Beijing 100871,China

力学快报（英文）

[1]Zhen Lu;Hua Zhou;Zhuyin Ren;Yue Yang;Hong G.Im-.A Lagrangian-based flame index for the transported probability density function method)[J].力学快报（英文）,2022(01):30-34

subgrid

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