热声发动机系统稳定性分析

STABILITY ANALYSIS OF A THERMOACOUSTIC ENGINE

热声发动机系统的自激振荡起振过程是在远离平衡态条件下发生的自组织过程,是决定热声发动机能够正常运行的关键过程。本文根据非平衡态热力学,针对起振过程开展热声系统热力学稳定性研究。将Glansdorff-Prigogine稳定性判据引入到热声系统稳定性分析中,借助CFD软件,分析了两种定态的稳定性,两种定态分别对应了温度梯度小于和大于临界温度梯度的情况。验证了非平衡态热力学稳定性分析在热声发动机自激振荡起振现象研究中的可行性。

The onset process of a thermoacoustic engine is a self-established process occurring in the region far away from equilibrium, which is a key process deciding whether a thermoacoustic engine functions properly or not. With reference to the theory of non-equilibrium thermodynamics, thermodynamic stability analysis aiming the onset process of a thermoacoustic engine was performed. Based on the Glansdorff-Prigogine stability criterion, the stabilities of two steady states, with temperature gradient smaller and larger than the critical temperature gradient, respectively, were studied with the assistance of CFD software. The computation proves the feasibility of the stability analysis from viewpoint of non-equilibrium thermodynamics for the study on the onset process of the thermoacoustic engine.