Study On Wind Resistance Of Low-rise Houses Based On Rotating Damping Energy-consuming Devices

Typhoon is a kind of natural disaster,the economic losses caused by the typhoons and the casualties are very serious.Coastal areas in China are often hit by typhoons.The results of previous wind disaster investigations show that more than half of the loss is caused by the destruction of low-rise houses.In the field of wind resistance research,most of the wind engineering researches in the world are concentrated on high-rise buildings and large-span bridges.There are few studies on the wind load characteristics of low-rise houses.Therefore,it is of great practical significance to carry out research on wind resistance of low-rise houses.In this thesis,using the Fluent software,the Reynolds stress(RSM)turbulence model is used to study the partial pressure distribution law of low-rise houses with geometric dimensions of 10m×8m×9m and roof angle of 30°.A variety of energy-consuming devices installation schemes were designed and simulated and analyzed one by one,and corresponding wind tunnel tests were also carried out in the wind tunnel laboratory.The data collation results show that the numerical simulation method adopted in this thesis can accurately reflect the law of wind pressure distribution on low-rise houses.On this basis,this thesis has conducted the following research on low-rise houses:(1)Based on the conceptual model of the low-rise house energy-consuming devices proposed by the research group,this thesis gives a more abundant device layout scheme,and simulates the working state of the device impeller rotation,and introduces the simulation method of the main and passive rotation of the device;(2)The Realizable k-? model is used to optimize the analysis of the device impeller;the geometric parameters of the wind-resistant energy-consuming device are optimized,from the blade tip speed ratio of the device impeller,the impeller root mounting angle,the tip to the blade heel angle,etc.In the pross of parameter optimization,a set of device geometry parameters is calculated that cause the device to generate maximum power.At the same time,the efficiency of the energy-consuming device during the biasing operation is given,so that further improvement is made to the energy-consuming device;(3)Through the wind tunnel test method,the low-rise double-slope houses with pneumatic energy-consuming devices were tested.The effects of the device on the wind pressure distribution of the roof were obtained by comparing the changes of the averagewind pressure coefficient of the roof under six working conditions to obtainreasonable installation of energy-consuming devices;(4)Numerical modeling of the same conditions of each working condition in the wind tunnel test was carried out.FLUENT 17.0 was used to simulate the typhoon effect of low-rise houses.The Reynolds pressure turbulence model is used.The energy consumption of the device during simulation is simulated by sliding grid passive rotation.The thesis gives a comparison of multiple simulation results.Fitting with the conclusion of the wind tunnel test,the results are more consistent.The numerical simulation results show the influence of the number of devices and installation cases on the wind pressure distribution of low-rise houses.