Testing Research On NO_x Emissions Influence Of Combustion Adding CO₂ In Gasoline Engine

This article mainly research the gasoline engine mixes burning CO₂ to the NO_x emission influence, analyzed the air admission to mix burning CO₂ to reduce the NO_x emission the mechanism, and based on this, the NO_x emission model which provided to the Fluent software has carried on the compatible revision, selected the solution model each main parameter, suited this article to study the operating mode the NO_x emission model. And aims at the air cylinder working substance fluid region establishment three-dimensional model, and moves the grid technology using the Fluent non-structurized grid, in the rapids combustion process NO_x production chemical kinetics foundation, as calculates the platform take the Fluent various models mutual coupling, the NO_x emission model which after will mix burning CO₂, establishes through UDF to link in the Fluent software, used the finite volume method mixed after the gasoline engine air admission burning CO₂ to discharge product NO_x the production process to carry on the numerical simulation. At the same time, simplex four stroke gasoline engine has carried on the corresponding series experiment in Honda HODNA on the G200. In this article studies in the operating mode scope, through the theory, the simulation and the experimental quite comprehensive research air admission mixed burning different current capacity CO₂ to the NO_x emission influence and the rule, provided the reference with the EGR deep research.This article used the Fluent software mixed after the gasoline engine air admission burning CO₂ the NO_x production process to carry on the numerical simulation. After the numerical simulation and the experimental comparative analysis, both results are quite consistent in the tendency, analyzed the tentative data and the model result difference through mathematical statistic's method, explained that after mixing burning CO₂ the NO_x emission model to be possible to reflect mixes burning under the CO₂ condition the NO_x production process. Through the simulation and the experimental proof, the air admission joins right amount CO₂ to be able to reduce in air cylinder's maximum temperature and the whole combustion temperature, obviously reduces the NO_x emission strength, but mixes along with the air admission burning the CO₂ current capacity increase, the NO_x emission strength reduces the tendency changes slow, in compares the high speed (1 600r/min～2 000r/min) under the condition, the air admission mixes burning right amount CO₂ to reduce arranges the NO_x ideal effect.