公路隧道自然通风热动力学稳定性分析

Analysis of the thermodynamic stability of natural ventilation in road tunnels

在公路隧道自然通风原理分析的基础上,建立通风系统的理论模型,表明热力学不可逆过程和动力学可逆过程共同决定了自然通风系统的发展,而其发展方向是由熵平衡方程所决定的。在理论模型的基础上,借助Lyapounov稳定性理论建立系统热力学和动力学稳定性判据,而二者的组合判据综合考虑了热力因素和动力因素的影响。进一步分析该组合判据发现,气体参数和非气体参数扰动影响关联,并且宏观参数扰动与具体宏观过程的相互作用是决定公路隧道自然通风系统稳定性的根本原因。

According to the principle analysis of natural ventilation in road tunnels, the theoretical model of ventilation system is established, which indicates the development of natural ventilation system is determined by thermodynamic irreversible process and dynamic reversible process jointly, and the entropy equilibrium equation decides its developmental orientation. With the theory of Lyapounov stability, the criterion. of systemic thermodynamic and dynamic stability are set up, based on the theoretical model, and their combined criterion comprehensively takes the effects of thermodynamic and dynamic factors into account, and from which it can be found the disturbing influences of air and non-air parameters are related, and the interaction of macroscopic parameters fluctuation and specific macroscopic process is the basic reason determining the stability of natural ventilation in road tunnels.