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以1/4波长驻波热声热机为研究对象,建立了平行板叠结构回热器以及异形板叠结构回热器的数值模型,采用Fluent软件分析了这两种结构回热器产生的压力、速度以及流场.研究结果表明:异形板叠结构回热器自激振荡达到饱和所需的时间比较短,压力幅值比较高;非线性声场的扰动,导致不同时刻回热器冷热两端温度分布不稳定,相比平行板叠结构回热器,异形板叠结构回热器温度梯度比较小,有利于低品质热源的应用;针对板叠结构回热器,改变平板的结构,有利于实现热声系统的匹配;异形板叠结构回热器周围的流场明显强于平行板叠结构回热器,有利于流固之间的耦合,提高了热声转换的效率.
A quarter-wave standing-sound thermoacoustic engine is taken as the research object. The numerical model of regenerator with parallel plate stack structure and regenerator with irregular plate stack structure is established. The pressure generated by the two regenerator structures is analyzed by Fluent software , Velocity and flow field.The results show that the time required for the self-oscillation of the shaped plate stack to saturate is relatively short and the pressure amplitude is relatively high. The disturbance of the nonlinear sound field leads to the hot and cold of the regenerator at different times Compared with the parallel plate stack regenerator, the temperature gradient of the regenerator with special plate stack structure is relatively small, which is beneficial to the application of low quality heat source. For the plate stack structure regenerator, the structure of the plate is changed Which is conducive to the match between thermoacoustic systems. The flow field around the regenerator with special-shaped plate-stack structure is obviously stronger than the regenerator with parallel plate-stack structure, which facilitates the coupling between fluid and solid and improves the efficiency of thermoacoustic conversion.