Exergy Research On Power System Of Air Powered Vehicle

Without using any mineral fuel, the air-powered vehicle(APV), which outputs the mechanical energy transformed from the compressed air energy into the torque form, is obviously important to society. The containers are filled in the recharge station, where fresh air is compressed to high pressure by an electric air compressor. In this way, APV exhausts only pure air and turns to be a completely zero-pollution vehicle.This thesis analyzes the exergy consumption of APV's power system.Guided by exergy theory,the mathamatic model of APV's power system is established ,and the working principles of the power system are given,then test bench for the power system is built and the results proves the correctness of the mathematical model. All these provide the optimization and further research of the power system with theoretical base, which will be both theoretically and practically important in the further research work.The whole thesis consists of the following chapters:Chapter 1 briefly states the rearch state of high pressure pneumatic system and APV,and explains the significance of exergy analysis on APV's power system,finally summaries the main rearch objects of this thesis.In chapter 2,the consist of APV's power system is discussed,the working principles of APE and the energy emission features of the compressed air are analyzed with the claim that, the essential way to improve the efficiency is to improve the exchange conditions for expansion process in the cylinders.In Chapter 3, the mathamatic model of APV's power system is established with the applying the exergy theory.Base on the model,the simulation of the power system is carried on. The rearch shows the distribution of exergy in power system and claims that about 30 percent of total exergy is lost in pressure reduction with throttling,which indicates that pressure reduction with throttling is not very suitable for high pressure pneumatic system such as APV.In Chapter 4 ,the working characteristics of the exergy distribution in the power system, the influences on the distribution brought by the parameters as presure of pneumatic source,inlet air pressure,stroke-bore ratio of the cylinder,and the temperature of environment are comprehensively analyzed.The difference of two pressure reductions(pressure reduction with expander and pressure reduction with throttling) is disscussed.In Chaper 5,the test bench for APV power system is built up.The experimental researches on the APV power system and the exergy loss in throttling depressurization are accomplished.In Chaper 6,the research work is summarized and the perspectives on the future are presented.