The Performance Optimization Of Thermoacoustic Engine

Thermoacoustic engine,which is based on the principle of the thermoacoustic effectis a kind of new mechanical energy conversion.It has many advantages,such as simplestructure and composition,long life,high reliability,green working medium,ect.Due to itsvarious advantages,it has attaracted much attention in academia and industry.By nowThermoacoustic engine has become a hotspot in the world.This article is on the basis of previous studies, making the exergy efficiency insteadof efficiency as the research object,using the method of finite time thermodynamics, andquoting the new objective function to optimize the performance of the thermoacousticengine and analyze the relationship of the various of external and internal factors to thisoptimization.The results will provide the basis for the theoretical research and practicaldesign.The main work of this article includes the following sections:Firstly,analyzeing the performance of the thermoacoustic engine.The research isdivided into two parts.Part one,by using the finite time thermodynamics and quoting theZ objective function, analyz the relationship between exergy efficiency and outputacoustic power of the reversible and irreversible thermoacoustic engine micro—cyclemodel, deriving its optimization and analyz this optimization which was accounted forthe irreversible factors and heat leakage coefficient.The other Part, by using the samemethod above,analyz the relationship between exergy efficiency and output acousticpower of the irreversible thermoacoustic engine which follows the complex exponentialheat transfer law.From the research,obtaining that both of the output acoustic power andexergy efficiency of the thermoacoustic engine are the single-valued function which havethe same intermediate variables,and there is an optimal intermediate variables thatoptimalize the output acoustic power and exergy efficiency.Secondly,analyzeing the performance of the thermoacoustic refrigerator.Theresearch is nearly the same as thermoacoustic engine,by using the finite timethermodynamics and quoting the Z objective function, analyz the relationship betweenexergy efficiency and cooling rate of the irreversible thermoacoustic refrigerator which follows the complex exponential heat transfer law. And From the research,obtainingthat both of the cooling rate and exergy efficiency of thermoacoustic refrigerator are thesingle-valued function which have the same intermediate variables,and there is anoptimal intermediate variables that optimalize the cooling rate and exergy efficiency.Thirdly,introducing the CyclePad software which is designed by Professor Wu andhis team.With this software, by the form of illustrations, introduce the features andapplication of the CyclePad,and successfully simulate the Brayton-cycle that is the idealcycle of the thermoacoustic engine micro-cycle.