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

引用

Chinese Journal of Aeronautics 2021年第4期34卷 403-415页

作者： Qing XIE Zhuyin REN Ke WANG Hongjun LIN Shoutang SHANG Wei XIAO School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Institute for Aero Engine Tsinghua UniversityBeijing 100084China Aero Engine Academy of China Beijing 101300China AECC Shenyang Engine Research Institute Shenyang 110000China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412000China

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 *** 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 *** dependence of flammability limits on turbulent intensities is tabulated and serves as the flammability criterion for kernel *** Lagrangian flame particle tracking,flame particles are tracked in a structured grid with flow fields being interpolated from a Computational Fluid Dynamics(CFD)*** particle velocity follows a Langevin model consisting of a linear drift and an isotropic diffusion *** Karlovitz number is employed for the extinction criterion,which compares chemical and turbulent *** integration of the above two-step analysis approach with non-reacting CFD is achieved through a general interpolation interface suitable for general unstructured CFD *** method is demonstrated for a methane/air bluff-body flame,in which flow and fuel/air mixing characteristics are extracted from a non-reacting *** 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 *** 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

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Modelling ignition probability with pairwise mixing-reaction model for flame particle tracking

引用

Chinese Journal of Aeronautics 2021年第5期34卷 523-534页

作者： Qing XIE Zhuyin REN Ke WANG School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Institute for Aero Engine Tsinghua UniversityBeijing 100084China Aero Engine Academy of China Beijing 101300China

Reduced order models for ignition analysis can offer insights into ignition processes and facilitate the combustor *** this study,a Pairwise Mixing-Reaction(PMR)model is formulated to model the interaction between the flame particle and the surrounding cell mixture during Lagrangian flame particle ***,the model accounts for the two-way coupling of mass and energy between the flame particle and the surrounding shell layer by modelling the corresponding turbulent mixing,chemical reaction and evaporation process if *** state of a flame particle,e.g.,burnt,hot gas or extinguished,is determined based on particle *** model can properly describe the ignition process with a spark kernel being initiated in a nonflammable region,which is of practical importance in certain turbine engines and has not been rigorously accounted for by the existing models based on the estimation of local Karlovitz *** model is integrated into an ignition probability analysis platform and is demonstrated for a methane/air bluff-body flame with the flow and fuel/air mixing characteristics being extracted from a non-reacting *** results show that for the spark location being at the extreme fuellean outer shear layer of the recirculation zone,PMR can yield ignition events with a significant number of active flame *** mechanisms for the survival of the initial flame particles and the entrainment of the survived flame particles into the recirculation zone are *** results also show that the ignition probability map from PMR agrees well with the experimental observation:a high ignition probability in the shear layer of the recirculation zone near the mean stoichiometric surface,and low ignition probabilities inside the recirculation zone and the top stagnation region of the recirculation *** parametric study shows that the predicted shape of the ignition progress factor and ignition probability is in general inse

关键词： Bluff-body stabilized flame igniting process Ignition probability Lagrangian particle tracking Pairwise mixing-reaction

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