Analysis of Turbulence and Surface Growth Models on the Estimation of Soot Level in Ethylene Non-Premixed Flames  

作　　者：Y.Yunardi Edi Munawar Wahyu Rinaldi Asbar Razali Elwina Iskandar M.Fairweather 

机构地区：[1]Department of Chemical Engineering, Syiah Kuala University [2]Department of Mechanical Engineering, Syiah Kuala University [3]Department of Chemical Engineering, State Polytechnics of Lhokseumawe [4]School of Chemical and Process Engineering, University of Leeds

出　　处：《Journal of Thermal Science》2018年第1期78-88,共11页热科学学报（英文版）

基　　金：financeally supported by Syiah Kuala University,Banda Aceh,Indonesia described through H-Index Research Scheme,Contract No:1445/UN 11/SP/PNBP/2017

摘　　要：Soot prediction in a combustion system has become a subject of attention, as many factors influence its accuracy. An accurate temperature prediction will likely yield better soot predictions, since the inception, growth and de- struction of the soot are affected by the temperature. This paper reported the study on the influences of turbulence closure and surface growth models on the prediction of soot levels in turbulent flames. The results demonstrated that a substantial distinction was observed in terms of temperature predictions derived using the k-c and the Rey- nolds stress models, for the two ethylene flames studied here amongst the four types of surface growth rate model investigated, the assumption of the soot surface growth rate proportional to the particle number density, but inde- pendent on the surface area of soot particles,f（As） = pNs, yields in closest agreement with the radial data. Without any adjustment to the constants in the surface growth term, other approaches where the surface growth directly proportional to the surface area and square root of surface area, f （As） = As and f （A,） = √As, result in an un- der-prediction of soot volume fraction. These results suggest that predictions of soot volume fraction are sensitive to the modelling of surface growth.

关 键 词：SOOT conditional moment closure COMBUSTION surface growth NON-PREMIXED turbulent flame 

分 类 号：TK16[动力工程及工程热物理—热能工程]