Experiment And Numerical Simulation Of Gasoline Combustion In Porous Media

The utilization of the liquid fuels closely connects with the people life.The traditional diffusion combustion of the liquid fuels always has lower combustion efficiency and higher emission.As gasoline is an important liquid fuel,how to improve its combustion efficiency,reduce its pollutant emission is of great significance.The porous media combustion is a novel combustion technology.It has a lot of advantages over the traditional combustion,such as a large range of adjustable power,high efficiency,low pollutant emission.Based on a novel designed porous media burner of the liquid fuels,the paper aims to investigate the gasoline combustion characteristics in the liquid fuel porous media burner.The gasoline combustion along with its numerical simulation was carried out in the liquid porous burner,as it follows:The experimental investigation of the gasoline combustion in the porous media burner.Using methane gas preheating chamber porous media,the paper analyzes the specific conditions of gasoline ignition stability,The results showed that methane can quickly caught fire,and began to burn,with the increase of burning time,methane combustion flame gradually spread to the upstream,preheat temperature and pollutant emission to stabilize gradually;Gas atomized droplets can achieve rapid fire inside the preheating of porous media,each point temperature rise rapidly,and gradually tend to be stable,CO,CH pollutants such as rapid rise in gasoline startup,then gradually decreased,and gradually reach the stable state,form a stable combustion.By changing the change the size of the equivalent ratio,this paper discusses the gas combustion temperature distribution in the porous media and pollutants.The results show that :Within a certain range,when increasing gas flow rate,the burning effect is better;With equivalent ratio increases,the combustion temperature,flame stability position closer to the upstream porous media.CO emission concentration decreases with increasing equivalent ratio,if close to the theory of equivalent ratio,CO emission concentration increased,in addition,the CO generated is related to the temperature distribution.NO_x emission concentration in porous media with equivalent ratio gradually increase.The numerical simulations of the gasoline combustion in the physical model of the liquid porous burner were investigated.Gasoline after injection into the porous medium combustor can rapid combustion,the combustion chamber temperature rise rapidly,gasoline burning high apparent move upstream,burning soon reach the best state,and increase the gas flow rate can be improved combustion effect.Along with the increase of the equivalent ratio of the combustion chamber temperature rise obviously,significant increase in the area of high temperature,combustion flame can achieve upper ground floor of porous media and the temperature distribution more uniform,and gas particle velocity distribution and temperature distribution in the contact closely.The distribution of CO₂ and H₂O mainly with the chemical reaction,its distribution are positively related with temperature,as the combustion flame moves upstream and the increase of the high temperature area,reduce CO emissions,NO mainly distributed in the low temperature area and NO₂ produced in high temperature.Along with the increase of the equivalent ratio,the reaction zone downstream of the gas particles gradually reduce,the upstream reaction zone distribution of O₂ increased,that is towards the upstream area of porous media combustion.The experimental results compared with the results of numerical simulation.Using octane instead of gasoline in Fluent software for numerical simulation,and compared with the experimental data.Found between experiment and numerical simulation of combustion zone and evenly distributed upstream temperature is higher,the best combustion zone burning effect is good,the experiment and the temperature distribution in line with the corresponding numerical simulation.In the same way,The experimental measured data CO and NO_x and CO and NO_x data of numerical simulation of the burner outlet consistent results.