Effects of Building Enclosure in Front Space of Railway Passenger Stations on Its Wind and Thermal Enviroment

With the rapid development of global urbanization， the ecological environment has been damaged， and the climate has become more and more severe. The most obvious manifestation of this is the urban local microclimate， where perceptions of hot and cold microclimates seriously interfere with people's daily life and work. The urban local microclimate is formed by the interaction of multiple spatial elements， among which building combination and form are the main factors affecting the local spatial wind and thermal environment. As a gateway to the city and a climate-sensitive area， the microclimate environment directly affects the city’s image as well as people’s work and travel. Therefore， this study took Chengdu， a hot-summer and cold-winter region， as an example， through the simulation and superposition analysis of the wind-heat environment in the open space in front of the stationin with different building envelopes during summer and winter， it was found that the envelopes had a more significant effect on the wind-heat effect and uncomfortable values in winter， showing a negative correlation； in summer， the "mouth"-shaped differed from the "paralle"- shaped， and the "paralle"-shaped differed from it in winter， which was negatively correlated. In summer， the wind-heat environment in open spaces with either "mouth"-shaped or "parallel"-shaped configurations showed greater sensitivity to enclosure ratios， while in winter， similar sensitivity was observed between "mouth"-shaped and U-shaped configurations.