变径管对双级行波热声发动机的性能影响研究

Investigation on the Performance of a Two-Stage Traveling-Wave Thermoacoustic Engine by the Effect of Variable Diameter Tube

在双级行波热声发动机的谐振管中加入变径管,并利用deltaEC(Design Environment for Low-amplitude ThermoAcoustic Energy Conversion)对其进行数值模拟分析,探究变径管在2个热声热机单元中无负载及外接负载时,对换热器间温差和回热器声功输出性能的影响。通过调节变径管的内直径、长度和位置,分析其对双级行波热声发动机的影响。模拟结果表明,在恒功率的情况下,变径管通过在不同的位置和内直径下有效调节相位、压力幅值、体积流率等,从而影响热声发动机的系统稳定温差和输出性能,使热声热机出现低稳定温差、高能量产出或更高的相对效率,从而适应不同应用场合,合理规划能源使用。

A numerical simulation of a two-stage traveling-wave thermoacoustic engine with reducers is investigated.The results showed that the variation of different inner diameter,length,and position of the reducer affect the temperature difference and output performance of heat exchanger between two thermoacoustic engines.When both thermoacoustic engines operate under the same constant power,the reducers affect the temperature difference and output performance of the system by adjusting the phase at different positions and inner diameters that result in low-temperature difference and high energy output.