Study On Wind Pressure Characteristics And Hole Cumulative Energy Effect Of High-rise Building With Opening

High-rise buildings in the environment than the surface rich wind resources,highaltitude wind is the most promising renewable energy future,high-rise buildings open hole after the formation of the slit effect can increase the flow velocity,therefore in the highrise building facade mouth of the wind power was formed by wind power and the building integration model is a kind of effective and feasible way.In order to ensure the normal operation of the functions of wind power generation and integrated building structure in the service period,it is necessary to systematically study the wind load characteristics and energy accumulation effect of open-hole high-rise buildings.Wind tunnel test and numerical simulation are used to study the wind pressure characteristics,flow field characteristics and wind energy distribution law of open-hole high-rise buildings.For rigid models with different opening rates between 2%,4%,6%,8% and 10%,the same step pressure test was carried out in class C wind field,and the wind pressure coefficient distribution characteristics on the surface of the building model after opening,the wind pressure power spectrum characteristics near 5H/6 height and the coherence of surface wind pressure were studied.The results show that the overall wind pressure coefficient on the building surface can be effectively reduced by opening the tunnel,but the wind pressure coefficient near the hole on the leeward side of the model will increase.As the opening rate increases,the negative pressure inside the hole will increase.Open hole on the windward side pulsating energy hasn't changed,but it can weaken the extent of the vortex shedding side,when the airflow by building block,a part of the air flow from the top downward,part of the air flow around from the side,a part of the air flow from the bottom upward,in addition to the four directions of the up and down or so four vortex flow disturbance plus air flowed out of the mouth of the cave have significant energy leads to low frequency and high frequency band.The open hole has little effect on the horizontal attenuation coefficient of pulsating wind pressure between two points on the windward surface.The horizontal attenuation coefficient of the pulsating wind pressure between two points on the side is reduced by the hole,but the effect is not obvious.The horizontal attenuation coefficient of leeward surface has a tendency to decrease with the increase of hole opening rate.After opening the hole,the vertical attenuation coefficient between two points on the building is not affected.Based on the velocity test results of seven groups of high-rise building models with different opening rates,six groups of different opening forms and five groups of different thickness to width ratios under wind fields of category B,C and D,the variation law of the wind speed ratio at the entrance of the building with different wind fields,opening rates,opening positions,wind direction angles and model thickness to width ratios was studied.The results show that the wind speed amplification effect is the best at the opening rate of 4% and at the height of 5H/6.When the Angle between the hole axis and to flow is less than 30 ° wind speed ratio can reach the maximum,but after more than 30 ° Angle,wind speed decreases quickly than;Based on the experimental results,a formula for calculating the wind speed ratio changing with the opening rate and opening position is proposed.The numerical simulation results are compared with the wind tunnel test results to verify the good adaptability and credibility of the numerical simulation method.The influence of opening rate,opening position and opening form on the flow field of supertall buildings with openings is studied systematically by means of numerical simulation.It is verified that opening the hole can effectively enlarge the wind speed inside the hole and effectively gather wind energy.It is proposed that the optimal fan blade area is about 51% and the optimal installation location is about 1.5/7 of the depth of the hole.Based on the numerical simulation results,the formulas for calculating the variation of downwind speed ratio and wind speed ratio with the hole opening rate and hole opening position of type C landform,as well as the formulas for calculating the ratio of wind speed ratio and wind speed ratio between type B landform and type C landform are proposed.The formula proposed in this paper can be used to calculate the wind speed ratio and wind speed ratio or wind speed and wind energy under the conditions of B,C and D landforms,different opening rates and different opening heights,providing a basis for the application of wind power generation in high-rise buildings with holes.At last,the paper summarizes the whole paper briefly,and puts forward the further research prospect for the application of wind power generation in open-hole super highrise buildings.