分置式斯特林发动机热动力学建模

Thermal dynamic modeling of a split Stirling engine

文章建立了耦合电磁力的分置式斯特林发动机动力学模型。以膨胀活塞与压缩活塞的瞬时位移量作为Matlab/Simulink数值计算模型的反馈输入量,由于工质流体的总质量不变,利用气体状态方程计算了瞬时循环压力,利用回热器中的流动损失计算了压缩腔和膨胀腔之间的压力向量差,利用动生电动势平衡方程计算了发电线圈的瞬时电流值,并将膨胀活塞和压缩活塞的位移波形进行了对比分析;然后根据振动系统的相关理论,分析了分置式斯特林发动机稳定运行的必要条件。

The dynamic model of coupling electromagnetic force of split Stirling engine was established. The transient displacement vectors of the expansion piston and compression piston were used as feedback vectors in numerical computation models of Matlab/Simulink. With the unchanged total mass of working fluid, the instantaneous cyclic pressure was computed by the gas state equation. The differential pressure vector between the expansion space and compression space was computed by the flow loss in the regenerator. The instantaneous current of generator winding was computed by the balance equation of motional electromotive force. The displacement wave forms of the expansion piston and compression piston were contrasted. In addition, one of the necessary conditions for the steady operation of split Stirling engine was deduced by oscillation theory.