車輛對城市街谷熱環(huán)境的影響研究
[Abstract]:With the acceleration of urbanization, people's living standard is improving day by day, the purchasing power of cars is increasing day by day, and the number of urban motor vehicles is increasing rapidly. A large number of vehicles, like moving radiators, emit a great deal of heat that seriously affects the thermal environment of the underside of the city valley. The street is the area where people and vehicles are most concentrated, and the distance and height of both are close. At this time, the heat discharge of vehicles can directly affect the thermal comfort of pedestrians. Therefore, it is of great significance to study the influence of vehicles on the thermal environment in the street valley. Taking Guangzhou urban roads and vehicles as the main research object, this paper comprehensively understands and evaluates the influence of vehicles in the street valley on the thermal environment by the combination of field measurement and numerical simulation. The main research contents are as follows: firstly, the traffic flow and vehicle type during the rush hour are investigated in Guangzhou city road, and according to the research results, the actual vehicles are selected. Secondly, the experimental results are carried out, and the time-dependent variations of surface temperature, air temperature, wind speed and wind direction in different areas of the vehicle surface are obtained by means of a comprehensive test of the body itself and the surrounding thermal environment. Thirdly, the data collected from the experiment are classified and sorted, and the relationship between the heat dissipation of the single vehicle and the change of ambient air temperature is analyzed. In addition, the surface temperature of the car body and the ambient air temperature are fitted linearly, which shows that they have a high correlation. Fourthly, on the basis of summing up the previous work experience, a three-dimensional physical model is established based on the experimental results, and the thermal environment around the vehicle is simulated by Fluent software, and the simulation results and the measured results are compared and analyzed. It is found that the measured results are in good agreement with the simulation results, and the simulation results can meet the requirements of engineering accuracy. Finally, Fluent software is used to simulate the different dominant wind direction of single vehicle, double vehicle and many vehicles. The temperature variation in the pedestrian height plane (1.5m height plane) and the vehicle main heat source height plane (0.5m height plane) is analyzed. Based on the measured and simulated results, this paper summarizes the possible measures and optimization methods to mitigate the deterioration of the thermal environment in the street valley, which provides a reference for the optimization design of the thermal environment of the urban street valley in the future.
【學位授予單位】:華南理工大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TU119.4
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