Research And Verification Of Quantum Model Theory Of Miniature Thermoacoustic Engine

Miniaturization is an important development direction in many research fields of thermoacoustic engine technology.However,with the decrease of the size of system,the movement rules and properties of the working particles in the system is subject to change.This will lead to some deviations in the traditional analysis and design methods based on classical thermodynamics and linear law.Quantum mechanics is exactly the subject of studying the laws of motion of microscopic particles.The difference between it and classical thermodynamics lies in the description of the state and mechanical quantity of the particles and its variation law,its application will not be limited by scale.Therefore,this dissertation introduces the theory of quantum mechanics into the application of micro thermoacoustic heat engine,and carries out the work of exploring and verifying the quantum model theory of the micro-thermoacoustic system.Because the thermoacoustic engine includes the thermoacoustic refrigerator and the thermoacoustic heat engine,this dissertation discusses the two types of engines independently.In this dissertation,concepts of the generalized potential,resonance potential and weakly degenerate in quantum mechanics are used to analyze the performance of the microcirculation and the overall thermoacoustic engine.On the basis of theoretical analysis,some experiments and verification are carried out.It includes the following aspects:(1)The microcirculation performance of gas parcel under various potential field conditions is derived by generalized potential method.After analysis and comparison,it was found that under the same parameter condition,when the gas parcels work in a one-dimensional infinite deep well or a resonance potential well,the comprehensive effect of energy utilization efficiency and energy output rate of microcirculation is better than in other potential well conditions.(2)In the optimal resonant potential field,the effect of two different irreversible factors on microcirculation is analyzed,and the index and method of system performance optimizing are given.(3)The weak degeneracy of the gas itself is introduced into the analysis of microcirculation of thermoacoustic engine.The research object is expanded from a single gas microcirculation to the total number of gas microcirculation in the whole plate,and a model for the performance analysis of an irreversible quantum thermoacoustic heat engine is established.With the help of this model,a new method for selecting the stack length of thermoacoustic engine is proposed.(4)By adjusting the sound field,it can set up the expected resonant well condition in the regenerator to ensure the optimization of the performance of the thermoacoustic engine.So,a DDS-based SCM phase control circuit is designed for a micro double drive thermoacoustic system.(5)The prototype of micro thermoacoustic refrigerator and micro thermoacoustic heat engine optimized using traditional thermoacoustic methods are used to test.And it is proved that the sub-stack model method proposed in this dissertation for determining the optimal panel size of the thermoacoustic system is reasonable in principle and operable in practice.