Simulation Study On The Combustion Process Of Premixed Ethylene Gas With/without Stagnation Based On Detailed Reaction Mechanism

With the rapid development of China’s economy and the increasing level of people’s living standards,ethylene derivatives have become an indispensable substance in people’s daily life.At the same time,ethylene which is same as methane,has the high possibility to combust and release heat.The combustion process of ethylene can be used as a fuel for people to ultimate in processing and producing.But in large-scale chemical production it would lead to leakage which could form the flammable gas cloud and do harm to people’s life and production.Therefore,the research of ethylene combustion behavior is very important.This work mainly researches the combustion principle of ethylene in essence,so as to make better use of ethylene energy.First,the ethylene combustion process was simulated in unconfined space.After the advance of the model with detailed mechanismd had been determined,etermining the superiority of substituded,the influence of the initial gas velocity,equivalence ratio and ignition mode on the combustion process was analyzed.Then the combustion process of ethylene flame stagnation was simulated by the software CHEMKIN under small scale.The influence of equivalence ratio,flow rate from nozzle and inert gas ratio in the mixed gas on the Stagnant Flame during combustion was analyzed.The results describe the experimental conditions with more stable stagnation flame.On the basis of the CHEMKIN simulation results and the predecessors’ research on the thermal transmission theory,the software FLUENT was applied to simulate the two-dimensional combustion process of the flame stagnation.The work compares the results by two simulation methods and it was found two simulation methods have high consistency.Finally,in order to simplify the calculation process,a mechanism-simplified DRG method which is embodied in CHEMKIN was applied to simplify the GRI 3.0 mechanism by using the original Stagnant Flame project in CHEMKIN.Two methods was used to simplify mechanism,and then,the obtained mechanism after simplification was substituted into CHEMKIN and FLUENT.By comparing the simulation results with GRI 3.0 mechanism under the same working condition,there are some differences in temperature,composition and speed during the combustion process.However,in general,the simplification mechanism can describe the combustion of stagnation flame well.