某交通枢纽车辆备班楼室内污染物分布的数值模拟研究
发布时间：2018-12-18 00:57
【摘要】：综合交通枢纽的建设提高了城市交通的运输能力，为公众提供了方便快捷、安全可靠的出行条件，但巨大的车流量和人流量产生了很多污染物，其中汽车尾气和人体呼吸产生的二氧化碳是室内的主要污染物。汽车尾气中的污染物种类可达十多种，其中有多种气体对人体有害。室内二氧化碳浓度过高，会导致呼吸急促，引起头痛、血压升高等症状。本文通过研究室内污染物分布特点，对建筑形式和通风空调系统提出优化设计，为改善交通枢纽的室内环境提供参考。 本文以长沙市某综合交通枢纽的车辆备班楼为例，采用数值模拟方法对长途发车备班区、短途发车备班区和候车室的速度场、温度场、污染物浓度场和空气龄进行数值模拟，从而评价通风空调系统设计的合理性，，对不合理的地方进行优化并通过模拟来验证。 由于建筑形式对室内污染物分布有重要影响，本文通过七种不同外墙开敞模型的模拟分析，对长途发车备班区的建筑形式提出优化方案。通过对比不同风速下室内污染物浓度分布情况，发现送风速度对室内污染物浓度有重要影响，较高的送风速度能提高室内污染物的排除效率。针对短途发车备班区局部区域CO浓度过高和室内平均风速过大以及候车室局部区域CO浓度不均匀和温度过高的问题，提出优化方案。优化后的模拟结果显示，短途发车备班区室内CO平均浓度降低了10%，平均风速降低了5%；候车室室内CO_2平均浓度降低了6.7%，梯形区域的温度降低明显，降幅达到2~3℃。
[Abstract]:The construction of integrated transportation hub improves the transportation capacity of urban traffic and provides convenient, safe and reliable travel conditions for the public. However, the huge traffic volume and human flow produce a lot of pollutants. The carbon dioxide produced by automobile exhaust and human breathing is the main indoor pollutant. There are more than ten kinds of pollutants in automobile exhaust, among which many kinds of gases are harmful to human body. High levels of indoor carbon dioxide can lead to shortness of breath, headache, elevated blood pressure and other symptoms. By studying the distribution characteristics of indoor pollutants, the optimal design of building form and ventilation and air conditioning system is put forward in this paper, which provides a reference for improving the indoor environment of transportation hub. Taking the vehicle standby building of a comprehensive transportation hub in Changsha as an example, the numerical simulation method is used to simulate the velocity field, temperature field, pollutant concentration field and air age of the long distance departure preparation area, the short distance departure standby area and the waiting room. Therefore, the rationality of ventilation and air conditioning system design is evaluated, and the unreasonable place is optimized and verified by simulation. Because of the important influence of building form on the distribution of indoor pollutants, this paper puts forward the optimization scheme of building form of long-distance departure area through the simulation and analysis of seven kinds of external wall open models. By comparing the distribution of indoor pollutant concentration under different wind speeds, it is found that the air supply velocity has an important effect on the indoor pollutant concentration, and a higher air supply speed can improve the removal efficiency of indoor pollutants. Aiming at the problems of high concentration of CO in the local area of short departure preparation area, excessive average indoor wind speed and uneven CO concentration and high temperature in the local area of waiting room, the optimization scheme is put forward. The optimized simulation results show that the average indoor CO concentration and the average wind speed are reduced by 10% and 5% respectively; The average concentration of CO_2 in the waiting room was decreased by 6.7 鈩
本文编号：2385044
[Abstract]:The construction of integrated transportation hub improves the transportation capacity of urban traffic and provides convenient, safe and reliable travel conditions for the public. However, the huge traffic volume and human flow produce a lot of pollutants. The carbon dioxide produced by automobile exhaust and human breathing is the main indoor pollutant. There are more than ten kinds of pollutants in automobile exhaust, among which many kinds of gases are harmful to human body. High levels of indoor carbon dioxide can lead to shortness of breath, headache, elevated blood pressure and other symptoms. By studying the distribution characteristics of indoor pollutants, the optimal design of building form and ventilation and air conditioning system is put forward in this paper, which provides a reference for improving the indoor environment of transportation hub. Taking the vehicle standby building of a comprehensive transportation hub in Changsha as an example, the numerical simulation method is used to simulate the velocity field, temperature field, pollutant concentration field and air age of the long distance departure preparation area, the short distance departure standby area and the waiting room. Therefore, the rationality of ventilation and air conditioning system design is evaluated, and the unreasonable place is optimized and verified by simulation. Because of the important influence of building form on the distribution of indoor pollutants, this paper puts forward the optimization scheme of building form of long-distance departure area through the simulation and analysis of seven kinds of external wall open models. By comparing the distribution of indoor pollutant concentration under different wind speeds, it is found that the air supply velocity has an important effect on the indoor pollutant concentration, and a higher air supply speed can improve the removal efficiency of indoor pollutants. Aiming at the problems of high concentration of CO in the local area of short departure preparation area, excessive average indoor wind speed and uneven CO concentration and high temperature in the local area of waiting room, the optimization scheme is put forward. The optimized simulation results show that the average indoor CO concentration and the average wind speed are reduced by 10% and 5% respectively; The average concentration of CO_2 in the waiting room was decreased by 6.7 鈩
本文编号：2385044
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