Multi-objective Optimization Of Thermoacoustic System

Thermoacoustic engine is a new device which can realize the conversion of sound energy and heat energy.Heat energy is converted into sound energy,which is a thermoacoustic heat engine.The thermoacoustic refrigerator is that sound energy converted into heat energy.The principle of thermoacoustic engine is the thermoacoustic effect,it has many advantages,such as long life,no pollution because it has no moving parts and use the low grade energy.Due to its various advantages,it has attracted much attention in the world.But at the same time,the thermoacoustic engine system also has the disadvantage of low conversion efficiency,so it is significant meaning to study and optimize the thermoacoustic engine.The main content of the article is to optimize the parameters of the thermoacoustic system based on previous researches.The research work includes the following parts:1?Analyzing and studying the thermodynamic performance of thermoacoustic heat engine.A cycle model generalized irreversible thermoacoustic heat engine with complex exponentical heat transfer was built by using finite-time thermodymamics in which heat resistance heat leakage and internal dissipation were considered.The thermoacoustic heat engine Exergy efficiency and the efficiency is derived.exergy economic performance of the thermoacoustic is derived by combining thermodynamics and exergy applied to engine analysis.Through transforming ratio of high and low heat source temperature on both ends of the heat exchanger,makes the thermoacoustic engine exergy efficiency and exergy economic performance optimal.2?Analyzing and studying the thermodynamic performance of thermoacoustic refrigerator.The research content is similar to the thermoacoustic engine.A cycle model generalized irreversible thermoacoustic refrigerator with complex exponentical heat transfer was built.quoting ? objective function and using the method of finite time thermodynamics for objective function optimization.finding the optimal state of the system by changing the ratio of heat source temperature at both ends of the heat exchanger.Optimizing thermoacoustic refrigerator exergy economic under the complex exponential heat transfer law by using the method of finite time thermodynamics.analyzing to make the thermoacoustic refrigerator exergy economic performance optimization by making graphs of the relationship between exergy economic and ratio of high and low temperature.3?Multi-objective optimization of thermoacoustic refrigerator.The research is divided into two parts.A cycle model generalized irreversible thermoacoustic refrigerator with complex exponential heat transfer was built by using finite-time thermodymamics in which heat resistance heat leakage and internal dissipation were considered.First,constructing multi-objective function to use thermoacoustic refrigerator input power P,system exergy output rate A,system irreversible loss rate Q,cooling rate R.Analyzing the optimal performance of the system by using the linear weighted evaluation function method.Second,multi-objective optimization analysis of thermoacoustic refrigerator model with Min-Max Approach.The optimal solution for Min-Max Approach is points which have the minimum deviation from each optimal solution of optimization objective functions,balance the various objective function,make to achieve optimization of application performance of thermoacoustic refrigerator system.