Experimental Research On Wind Speed Distribution In Urban Streets

Along with the development of urbanization process the scale of cities became larger and larger.So many tall buildings hinder the exchange inside and outside the cities.Someone put forward the way of designing the air path and the air path maybe ease the problem of city pollution.The air path is built by changing the width of the streets.In this paper,a district in Beijing is selected as the experimental unit.The wind speed in city streets can be seen as the result of overlapping buildings,so this article includes single-row construction experiment and street experiment.In the paper,wind speed distribution around the row of buildings and in the street was analyzed.the ventilation effect of the air path is verified by comparing the wind speed of different streets.The main contents of this paper are followed below:(1)The ventilation effect of air path is analyzed by wind load code.the rough surface has inhibition to the wind.The rougher ground is,the smaller wind speed is.So many tall buildings make the ground rougher.According the roughness,the ground is segmented into A、B、C、D.Then the ventilation effect of the air path is verified by comparing the wind speed of A,B,C and D.(2)Test of flow field in the single Street.Through the wind tunnel experiment,we can get distribution of flow field around the single street.This included the higher side and the lower side.We analyzed distribution of the flow field around the single street and got the regulation of flow field in the street.The regulation can lay the foundation for the research of flow field distribution in double streets.(3)Test of flow field in double streets.Building density and width of the double streets have a great effect on flow field in Double Streets.The content of the part included two kinds of Street building density.There are four widths for each street.The internal flow field was measured,and got the distribution of flow field in double streets.