地下车库排风量的计算和污染物扩散过程模拟

【中文摘要】 对5种常用地下车库通风换气量计算公式的比较表明因公式中系数取值的差异而导致不同公式计算结果相差悬殊。对密闭大空间汽车怠速行驶条件下排气尾流中污染物扩散过程进行了数值模拟,分析了CO的浓度分布及扩散特性。结果表明单车尾气动量小,温度低,形成的烟羽流经过一段距离之后,迅速扩散,其扩散及其分布对合理的布置排风口位置具有重要的影响。

【英文摘要】 Five kinds of formulas commonly used to calculate ventilation rate of underground garage were analyzed. Significant differ- ences among the calculation results were gained by using different formulas. A feasible formula was recommended by comparison. Dynamic grid in CFD technology was used to simulate the dispersion process of exhaust pollutants from an idling vehicle in a large confined space. The proliferation characteristics of CO in exhaust pollutants were studied. Results show that the momentum of the vehicle exhaust is small and of low temperature. The plume formed rapidly spread after some distance, and its proliferation characteristics have great influence on the position of air distribute of the mechanical ventilation system.

【中文关键词】 地下停车库; 通风换气量; 怠速; 排气尾流; 污染物; 扩散

【英文关键词】 underground car park; ventilating rate; idle condition; exhaust plume; pollutant; dispersion