Study On The Outdoor Wind Environment Of Traditional Villages In Huizhou

This paper studies the outdoor wind environment of traditional villages in Huizhou,focusing on the following four key issues: first,what is the current situation of the outdoor wind environment of traditional villages in Huizhou;second,how to evaluate the outdoor wind environment of traditional villages in Huizhou;third,what methods are used to study the outdoor wind environment of traditional villages;fourth,the outdoor wind environment of traditional villages in Huizhou How to improve the environment.Through field investigation and questionnaire survey,the problems were studied.The Xidi Village,Yu Yuancun and Zhifeng village were selected.The reliability and validity of the questionnaire were verified by SPSS software.The results of the questionnaire were calculated to prove that the questionnaire was reliable and valid.According to the questionnaire: 79% of respondents in Xidi village thought that the natural ventilation in summer was good;76% of residents in Zhifeng village thought that the natural ventilation effect was poor in summer,and 60% of the residents thought there was a deposition of pollutants in the local space and a stuffy sensation,indicating that there was a large area of quiet wind in the village and the wind dead angle;two villages generally believed that the wind speed was very cold in winter.Combined with the characteristics of wind environment in Huizhou,based on the evaluation standard of wind environment,the evaluation standard of outdoor wind environment in traditional villages in Huizhou is proposed.In summer,the wind speed at the outdoor pedestrian height(1.5m)shall be between 0.6m/s and 5m / s,and the amplification coefficient of wind speed shall be no more than 2 to avoid wind stagnation area and wind vortex;in winter,the wind speed at outdoor pedestrian height shall be no more than 5m / s,and the wind speed amplification coefficient shall be less than 2,and try to avoid the occurrence of wind stagnation area and wind vortex.Through the method of comparison between actual measurement and simulation,the third problem is studied: the simulation results of PHOENICS software are smaller than the measured results,but under the same outdoor wind environment conditions,the regularity of wind speed at each measurement point is basically consistent.This shows that it is feasible and reliable to use software simulation method to study the outdoor wind environment of traditional villages;the actual measurement shows that the wind speed in the internal tunnels of villages is generally less than 1 m / s,and the wind speed in open places such as squares and village entrances is basically greater than 1.5 m / s.Through PHOENICS software to simulate the influence factors of outdoor wind environment,the paper studies the influence of traditional village building planning and design on outdoor wind environment from four aspects: the width of village roadway,the shape of building patio,the scale proportion of patio,Opening of building doors and the layout of plant greening,and draws the following conclusions: the width of main street in traditional village is about 4m wind ring The width of the secondary roadway is about 2-3m,which meets the wind environment evaluation standard;the wind environment in the four types of patio is the best;the wind environment in the patio is the best when the width height ratio of the simulated patio is 0.2-0.6;the wind environment in the patio is the best when the "concave" plane D / H value is equal to 0.3;the wind environment in the patio is the best when the "return" plane D / H value is equal to 0.4.The air field of "return" type plane building patio(width height D / H value ratio is 0.4)is the best in the range of length width W / L value of 1-1.5.When studying the number of trees and the position of trees group relative to the village,it is found that when the number of trees is 80,four rows,the wind environment inside and around the building group is the best;When all the building doors are open,the air environment of the patio is the best;when the distance between trees group and village is 60 m and 100 m,the trees group has the best wind protection effect.The paper has 47 maps,41 tables,and 66 references.