Simulation Research On Reformer Of Ethanol Reforming Engine

Energy and environmental issues has always been the two main issues of the world today.With the development of economic,national authorities,research institutes,colleges and universities,as well as the concerns of manufacturers pay more attention on those issues.It is a pressing social need to developing a new non-polluting clean energy.The reformer of ethanol reforming engine,which mentioned in this article,with a good environment for resource-saving type of feature,can alleviate the increasingly serious energy crisis effectively and reduce exhaust gas pollution of the atmosphere,is a hot study of the new engine,arousing the concern of many researchers.In the paper,based on fluid dynamics software CFX and the analogous tests of the ethanol reformer,a simulating model of the ethanol reformer is presented and the simulations are conducted respectively on the performances of both reformers,one of those assembled on the exhaust pipe of the engine,and another of those assembled on the analogous test system.The analogous tests show that the compositions and the reform efficiency of the gaseous fuel vary with the working conditions.According to the measuring compositions of the gaseous fuel,the formulas of chemical reaction are presented. The boundary conditions are provided by the test of simulation,by means of the test results,the simulating model is improved.In the simulation model,a 3D unstable K-εturbulence model is used and the internal chemical reaction of the ethanol reformer is simulated.The model is able to simulate approximately the working process of the ethanol reformer,and is able to describe the variability of the compositions and reforming efficiency of the reforming fuel with the working conditions(temperature,and flow rate).The simulation model is applied to the simulation of the ethanol reformer on the engine.In this simulation,a simplified geometric model of U-shaped tube is used, and by means of the analogous test results,the boundary conditions and initial parameters are determined.The simulation results show that with the increase of the wall temperature and the inlet temperature and the flow rate,there is an increase of the reforming efficiency of the ethanol reformer which does not rise any more when the wall temperature and inlet temperature and flow rate rise to a certain extent. There is a larger influence of the inlet temperature and the flow rate on the reforming efficiency of the ethanol reformer,but a smaller influence of the wall temperature on the reforming efficiency of the ethanol reformer..As the reforming reaction processes,the internal temperature of the reformer would decrease,however,the exit temperature would increase if the reforming efficiency reaches a certain degree.