爆炸与冲击2017，Vol.37Issue(2)：353-364,12.DOI:10.11883/1001-1455(2017)02-0353-12
波纹管道阻火器内火焰传播的实验与数值模拟研究
Experimental investigation and numerical simulation of flame propagation and quenching process in the in-line crimped-ribbon flame arrester
摘要
Abstract
An experimental system and numerical model were set up to investigate ethylene-air premix deflagration flame propagation and quenching by crimped-ribbon flame arresters in a horizontal pipe,closed at both ends.The deflagration suppression experiment showed that,when the concentration of the flammable gas was close to the stoichiometric ratio (6.6％ ethylene by volume),the evolution processes of explosion pressure for the premixed gas of ethylene-air in the pipe (D=32,80,400 mm) could be divided into four stages:isobaric combustion,slow rise,quick rise and pressure oscillation.During the explosion,due to the interaction between the reflected pressure wave and the flame,the overpressure value fluctuated several times,and the pressure oscillation lasted normally tens of milliseconds.The ethylene-air deflagration flame velocity gradually increased with the increase of the pipe diameter and the decrease of the crimp height.Furthermore,the performance of the flame arrester gradually increased with the increase of the element length.The simulation result showed that the flame front was formed in a semi-sphere shape and spread around in the form of laminar diffusion after ignition at the closed end on the left side.When the flame reached the wall,its shape enlarged under the restriction of the pipe.Then the flame velocity at the near wall gradually exceeded that at the pipe axis,and finally a "tulip" flame was formed.A big amount of heat was lost as the flame front contacted the arrester element,under the influence from the rarefaction waves formed in the reaction area,the chemical reaction rate decreased rapidly,and the flame temperature decreased gradually,which resulted in quenching.During the whole explosion process,the pressure wave and the flame velocity were accompanied by drastic fluctuations through the simulation calculation.The influence mechanism of the porosity and the element length on the flame propagation was analyzed numerically.Finally,the relationship between the deflagration flame velocity and the explosion pressure was derived based on the classic theory of the heat transfer and the experimental data.This study will serve as accurate reference for the design and selection of the crimped-ribbon flame arrester.关键词
波纹阻火器/淬熄/“郁金香”火焰/爆燃火焰速度/爆炸压力Key words
crimped-ribbon flame arrester/quenching/"tulip" flame/deflagration flame velocity/explosion pressure分类
数理科学引用本文复制引用
孙少辰,毕明树,丁春辉,胡熙玉,刘刚,封宇..波纹管道阻火器内火焰传播的实验与数值模拟研究[J].爆炸与冲击,2017,37(2):353-364,12.基金项目
国家质检总局科技计划项目(2011QK083) （2011QK083）
沈阳市科技计划项目(F14-048-2-00) （F14-048-2-00）
