基于改进高斯烟羽模型的二氧化氮泄漏模拟分析

针对因缺乏实际环境因素的考虑而对二氧化氮气体扩散预测不准确的问题，提出可引入降雨量与地形来对气体扩散进行一定的研究分析。以原有高斯烟羽模型为基础，引入雨强以及粗糙度分别代表降雨量与地形来进行改进并进行数值模拟分析。通过对比分析，首先模拟了在同一高度下不同雨强以及不同粗糙度单独对气体扩散的影响；然后再从分别通过对下风向、横风向与气体浓度之间的关系对比；最后，将粗糙度与雨强同时作用并将结果与原模型进行对比分析。根据实验结果发现：降雨量和地势影响了在一定高度上气体扩散浓度值以及扩散范围，对比起传统的高斯烟羽模型，此模拟结果更符合实际。

Simulation Analysis of Nitrogen Dioxide Leakage Based on Improved Gaussian Plume Model

Aiming at the problem that the prediction of nitrogen dioxide gas diffusion is not accurate due to the lack of consideration of actual environmental factors, this paper proposed that rainfall and terrain can be used to study and analyze the gas diffusion. Based on the original Gaussian plume model, the rain intensity and roughness were introduced to represent rainfall and terrain respectively to carry out numerical simulation analysis. Through comparative analysis,the effects of differentrain intensities and different roughness on gas diffusion at the same altitude were first simulated, and then the relationship between downwind direction, crosswind direction and gas concentration were compared separately. Finally, the roughness and rain intensity were applied simultaneously and the results were compared with the original model. According to the experimental results, rainfall and topography affect the gas diffusion concentration and diffusion range at a certain height. Compared with the traditional Gaussian plume model, the simulation results are more practical.