Study On The Influence Of Trees In Severe Chilled Areas On Indoor Natural Ventilation Of Rural Buildings

With the urban construction getting better and more modern,more and more people pay attention to the city,but few people pay attention to the rural construction.This topic not only responds to the call of the two sessions to develop rural areas and build a new countryside,but also focuses on urban environmental greening.Through literature review and many visits to urban and rural areas and pastoral areas around the city,most of the traditional rural buildings are single buildings with courtyard walls on the first floor or two-story buildings,and the layout of each household is tight.The new rural areas that the state response to the construction,although the building type is the same,but the layout is uniform and relatively spacious,with a small area of greening around.Compared with the traditional rural areas,we can clearly feel the difference of wind speed field flow,and test the speed change of buildings under the shelter of obstacles,which can reflect the geographical conditions around Hohhot City in Inner Mongolia Autonomous Region,and the rural building groups are more vulnerable to environmental changes.Using the combination of field measurement and numerical simulation,through the numerical simulation software,this paper analyzes the influence of the surrounding wind environment of trees and the change of tree parameters on the indoor natural ventilation of rural buildings,and then analyzes the change law of indoor wind field with the change of tree parameters,so as to provide numerical analysis for the optimization scheme of indoor natural ventilation of rural buildings,And it has a certain practical value.Firstly,the wind environment around trees was measured on a six-direction experimental platform for the first time.The PS pixel histogram method was used to quantify the permeability.The feasibility of the simulation was verified by comparing with CFD simulation.The results show that under the same parameters,the simulation part of the data is consistent with the experimental data,that is,the simulation is feasible;Then,through the study of the influence of different tree permeability on the surrounding wind environment and the optimization of the permeability parameters,the maximum influence range of wind speed and flow field in the vertical wind speed distribution of trees is obtained,which lays the foundation for the subsequent numerical simulation;Secondly,through the simulation analysis of the three different tree permeability conditions after optimization,the factors such as the height width ratio of trees and the distance between trees and buildings are simulated.Taking the rural environment of Hohhot as the boundary condition,the influence of trees on the indoor natural ventilation of rural buildings is studied.According to the evaluation indexes of indoor wind speed and air age,the suitable range of indoor ventilation is obtained,and then get a reasonable layout which can improve the indoor ventilation.