A Versatile Numerical Tool for Simulating Combustion Features at Small-Scales  

作　　者：KANG Xin DENG Youcheng WANG Jianyong FAN Aiwu 

机构地区：[1]School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China [2]School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063,China [3]School of Mechanical&Mining Engineering,The University of Queensland,QLD 4072,Australia [4]School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Thermal Science》2021年第1期343-361,共19页热科学学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant Number 51806158);the Fundamental Research Funds for the Central Universities(WUT:2018IVA055,WUT:2019IVB029)。

摘　　要：A versatile numerical tool based on the open-source framework Open FOAM has been developed in this paper for modeling time-accurate,low-Mach number reacting flows,with a particular interest in small-scale flames.This tool consists of a gas-phase Navier-Stokes solver and a solid-wall heat conduction solver which can be implemented alone,or used together in a coupled means to reveal the small-scale combustion’s characteristics of significantly enhanced flame-wall thermal coupling.Validation works has proved that the tool is capable of reproducing experimental flames at various scales(from conventional to small scales),including well-recognized micro-flame features in literature such as three modes of premixed flame dynamics(weak flames,flames with repetitive extinction and ignition,and stable flames).Then,an experimentally-already-found but rarely-simulated unique phenomenon of diffusion flame street is successfully reproduced with well-captured flame structures.Moreover,the conjugate heat transfer model with the specific formulation of solid-wall heat conduction enables an attempt to simulate a novel,thermally-orthotropic combustor with its axial thermal conductivities superior to the transverse ones.Finally,computational performance of the developed Open FOAM solver is compared to that of the previously-used compressible flow solver Eilmer.The Open FOAM solver is found to show better wave-damping abilities for overcoming acoustic wave effects at the initial stage of simulations,and is much more efficient in terms of the computational cost.

关 键 词：MICRO-COMBUSTION Open FOAM conjugate heat transfer thermally orthotropic combustor flame streets 

分 类 号：TK16[动力工程及工程热物理—热能工程]