Numerical Simulation Of Soot Generationbased On LPP Combustion Chamber

Exhaust pollutants from gas turbines mainly include: carbon monoxide(CO),unburned hydrocarbons(UHC),soot,and nitrogen oxides(NOx).The formation of soot particles is unavoidable when fuel is burned.It is an atmospheric particulate pollutant formed by the aggregation of various large-molecular carbon-containing organic substances.Its emissions will cause great harm to the human body,the environment and the engine itself.The emission of soot particles can not only cause harmful effects on human health such as respiratory diseases,decreased lung function,and cancer;it can also cause the enhancement of the atmospheric greenhouse effect,inhibit the formation of ozone in the atmospheric troposphere,and change the hydrological climate in local areas.Reduce some environmental issues such as atmospheric visibility;and reduce the aerodynamic characteristics of the engine and reduce the engine life limit.The lean premixed pre-evaporation(LPP)combustion chamber is one of the most popular and least-emission engines used today.It is necessary to study the formation of soot particles in this combustion chamber.This paper analyzes the cold flow field and the temperature field after combustion of the LPP combustion chamber by modeling and numerically simulating its combustion process based on the LPP combustion chamber.Based on these results,the combustion chamber is reasonably modified.After finalizing the final model,numerical simulation of combustion was performed on the model,and the generation of soot particles in this combustion chamber was simulated by the Moss-Brookes model and the Moment model.It was found that the locations where soot was generated were mainly the locations where oilrich high-temperature combustion occurred,and processes other than nucleation such as oxidation and condensation processes were basically generated in the oil-rich hightemperature region.The particle size distribution in the axial direction is close to the normal distribution,and the particle size produced in the LPP combustion chamber is more fine.In this paper,the soot particle generation is compared again by a single modification of the pressure conditions and the fuel equivalent ratio,and the soot particle generation is simulated through the two models,and their concentration and particle size results are analyzed.In this paper,ethanol is blended in the fuel by keeping the number of carbon atoms unchanged,and the effect of soot formation is studied.In general,this paper conducts a numerical simulation of soot particles in a flame tube based on an LPP combustion chamber,and changes one single condition to study the formation of soot particles.