公路长隧道污染物的运移机理及一维解析分析

公路长隧道通风问题是公路建设者们所关心的问题之一。隧道通风过程同时也是污染物在风流中的运移过程 ,污染物在风流中的运移主要包括分子扩散、对流运移、紊流扩散、衰减转化四种形式。据质量守恒定理 ,分别推导出了污染物移流扩散方程和污染物紊流扩散方程。扩散方程、风流流动方程、边界条件及初始条件便构成了污染物、空气二元混合气体的对流—扩散的数学力学方程。最后进行了在定常条件下的一维理论分析和实例计算 ,结果表明进行公路长隧道风流中的污染物运移模拟计算时 ,只需考虑污染物移流和紊流扩散

Mechanism of pollutant movement in a long highway tunnel and one-dimensional analysis

The ventilation of a long highway tunnel is one of the concerns of highway builders.This ventilation process is also the movement of the pollutants in the wind.The latter mainly includes the forms of molecular diffusion, convective movement, turbulent current diffusion and attenuating transformation.By the law of conservation of quality, the diffusion equations of pollutant movement and pollutant turbulence can be followed.These diffusion equations,wind flow equation, boundary conditions and primary conditions contribute to the convection of the mixture of pollutants and air,the equation of diffusive mathematics mechanics.Finally,the one dimensional theory under the regularly given conditions is analyzed and the practical example is calculated, the results show that the simulating calculation of the pollutant movement in the wind in a long highway tunnel only needs the consideration of convection movement and turbulent current diffusion.5 refs.