适用于风向变化条件的毒气扩散模型研究

Study on a Gas Dispersion Model under Dynamic Wind Conditions

本文研究基于经典高斯扩散模式但适用于风向变化条件的毒气扩散模型。经典高斯扩散模式,例如高斯烟云模式和高斯烟团模式,成立的前提条件是在扩散过程中风向保持不变。但在实际应用中风向却常常是变化的。本文在经典高斯扩散模式的基础上引入坐标变换的数学方法,建立了一个能够应对风向变化条件的毒气扩散模型。该模型包括网格化预处理、高斯模式选择和坐标变化三个主要环节。文中详细阐述了模型的主要思想和核心算法。最后简要讨论了模型的程序设计和实际应用。

In this paper, we study a gas dispersion model under dynamic wind conditions, based on the Gaussian dispersion models such as Gaussian plume model and puff model that are widely used in previous literatures. These Gaussian models both assume that wind conditions should be constant in the process of dispersion, which is not always the case in practical applications. We combine some mathematical methods, such as coordinate transformation, with these Gaussian models to build our gas dispersion model which adapts to dynamic wind conditions. Our model consists of three parts： pretreatment of grid, Gaussian models selection, and coordinate transformation. We state the main idea and algorithm of our gas dispersion model in this paper. Finally, a simple discussion concerning program design and applications is given.