Impact Of Ventilation Corridor Optimization On Wind Environment Of Village Block Based On CFD Technology

Affected by climate change and human activities,not only the urban heat island effect and haze weather are becoming increasingly serious,but also the internal wind environment of villages and towns has been severely damaged.In recent years,the country has advocated the rational construction of urban and rural ventilation corridors to improve the ecological environment,However,the existing research mainly focuses on the planning of wind tunnels at the macro,meso,and internal levels of the city,lacking the construction of wind tunnels at the micro level of villages and towns.Therefore,it is necessary to strengthen the construction of air ducts at the village and town block scale,in order to make up for the shortcomings of micro level air duct research in villages and towns,and comprehensively promote the sustainable development of village and town living environment and the construction of beautiful rural areas.This thesis Select the block in Sanhe Town,Hefei City,Anhui Province as the research object,and combine relevant literature to elaborate basic theories such as ventilation corridors,wind environment,CFD technology,and air duct optimization methods,and select appropriate outdoor wind environment evaluation indicators.Collect and sort out satellite image data and meteorological data of the research area in the past six years,establish a site model,set simulation parameters,and verify the effectiveness of the simulation through field measurement,numerical simulation,and empirical research.Then,use CFD software Fluent to simulate the wind environment in the research area before and after the wind tunnel optimization,analyze the impact of the wind tunnel optimization on the local wind environment,and verify the feasibility of the optimization strategy proposed in this thesis.The research shows that:(1)The natural wind on the site as a whole exhibits a low wind speed and small fluctuation,and the current wind speed and wind pressure within the block affected by structures are relatively low.Therefore,it is necessary to propose air duct optimization strategies to improve the overall wind environment quality.(2)Comparing the wind environment simulation results before and after the optimization of the air duct,it was found that at a height of 1.5m,the overall wind speed in summer and winter increased by 0.30m/s and 0.27m/s,respectively,and the wind pressure difference before and after the building increased by 0.34 Pa and 0.53 Pa,respectively;At a height of 10 m,the overall wind speed in summer and winter increased by 0.25m/s and0.35m/s respectively,and the wind pressure difference before and after the building increased by 0.13 Pa and 0.15 Pa,respectively.Therefore,optimizing the air ducts in village and town blocks is indeed beneficial for improving the overall local wind speed,wind pressure difference,and human comfort,alleviating air pollution and heat island effects.At the same time,it also proves that the optimization strategy for air ducts in village and town blocks proposed in this article is reasonable and feasible.(3)When optimizing the construction of air ducts in villages and towns,it is necessary to follow the basic principles,methods,and steps of optimization as a whole,analyze the characteristics and current problems of the research area,and propose specific measures for air duct optimization from the aspects of street direction and width,open space,buildings,and adjacent interfaces.This study can provide reference and technical support for the short-term planning of Sanhe Town and the optimization methods of wind tunnels at the block scale of other villages and towns,and promote the sustainable development of the ecological environment of villages and towns,rural revitalization,and the construction of beautiful villages.