【作者】 向科兵； 李维嘉；

【Author】 Xiang Kebing;Li Weijia;School of Naval Architecture & Ocean Engineering, Huazhong University of Science and Technology;

【机构】 华中科技大学船舶与海洋工程学院；

【摘要】 热声发动机是一种新型的动力机械,利用热声效应进行功能转换。涉及非线性自激振荡、热声转换等复杂过程,内部流动、传热与热力过程高度耦合,对其机理的研究和大振幅声场下的理论计算。结合工质物性随温度变化的特点,采用Delta EC软件编程对现有的斯特林发动机试验系统进行建模,计算其热力学和动力学参数,分析了行波热声装置(环形圈与谐振管)内的振荡压力、体积流率、温度和声功等的分布情况,得出装置内的行波变化趋势。同时,由于基于线性热声理论的数值算法不适用于大振幅的热声计算,故采用商业软件CFD模拟了以氦气作为工质、充气压力1.5MPa和给定4000W加热量条件下的压力振幅和温度分布,并由此对比分析实验系统的频率分布特性、温度分布特性和声功分布特性。更多还原

【Abstract】 Thermoacoustic engine is a new-style heat engine, which based on thermoacoustic effects. The thermoacoustic heat engine involves complicated process of nonlinear spontaneous oscillation and highly coupled interaction between flow, heat transfer and thermodynamic conversion, study on operating system. According to the characteristics of the working medium property changes with temperature, Delta EC were used to calculate thermodynamic and kinetic parameters of the travelling wave thermoacoustic engine. Based on Delta EC model,the distributions of oscillating pressure, volume flow rate, temperature and acoustic power inside the loop section and resonator of the traveling wave thermoacoustic engine are analyzed. Moreover, Because of numerical algorithm based on linear thermoacoustic theory is not suitable to thermoacoustic calculation, business software,CFD were used to calculate the pressure amplitude and temperature distribution, whose working fluid is nitrogen,the filling pressure is 2MPa,and the given heat is 4000 W. And then we analyzed the frequency distribution, temperature distribution and acoustic power distribution characteristic of the experimental system.更多还原