Gedeon声直流对四级行波热声发动机性能的影响

Influence of Gedeon streaming on performance of four-stage travelling-wave thermoacoustic engine

为了研究Gedeon声直流对具有环路结构的四级行波热声发动机热效率的影响,基于热声学理论,在给定加热功率以及热声核入口参数的条件下,对不同Gedeon声直流下热声发动机内热声核进行模拟,探究Gedeon声直流对热声核的声场分布包括温度分布、体积流速振幅分布、压力振幅分布、压力与速度相位差分布、声功率分布以及总能流率分布的影响,针对Gedeon声直流对回热器以及热缓冲管内温度梯度的影响机制进行分析.结果表明,Gedeon声直流携带的能流是影响温度梯度的关键因素,给出Gedeon声直流对四级行波热声发动机热效率影响的定量评估.

A thermoacoustic core with various amount of Gedeon streaming under given heating power and inlet conditions was simulated based on the thermoacoustic theory in order to analyze the influence of Gedeon streaming on the performance of a four-stage thermoacoustic engine with looped configuration.The characteristics of acoustic field inside the thermoacoustic core,including the profiles of temperature,volumetric velocity amplitude,pressure amplitude,phase difference between pressure oscillation and velocity oscillation,acoustic power and total energy flow rate were calculated and analyzed.The mechanism of Gedeon streaming affecting the temperature profiles inside the regenerator and the thermal buffer tube was analyzed.Results show that the energy flow rate carried by the Gedeon streaming is the key factor in the local temperature gradient.The influence of Gedeon streaming on the thermal efficiency of the four-stage travelling-wave thermoacoustic engine was quantitatively evaluated.