Research On The Aerodynamic Characteristics Of Wings Of The Seagull And The Bionic Blade Of Wind Turbines Design Application

Wind power is an inexhaustible, inexhaustible renewable clean energy, and the windturbine is the best form of wind energy utilization. At present due to the problems of energycrisis and protect environment, the use of wind energy more and more attention in the world.The wind turbine is the best form of conversion of wind energy. The blade of wind turbine isthe core component of the wind turbine to capture the wind, leaves in the naturalenvironment of direct contact with air. Similar to produce lift conditions seagull wings, sowill the good airfoil and configuration seagull wings.Birds are higher spine flying animal adaptation from the ancient reptiles evolved,It hasthe flight characteristics of excellent after millions of years of evolution,not only hasadvanced features of reptile animal, Such as constant temperature、perfect circulatorysystem.And it has so many excellent properties such as stature is streamlining,surfacecovered with feathers,Forelimbs evolved wing、Skeletal light.So the bird is flying ability isvery strong,any kind of animal can not match.After thousands of years of evolution,the birdshas streamlined body、the skeleton structure of hollow、clever recycling system，to make itfly freely in the sky.The flight mode of birds has flapping wing flying and glidingflight,While the wing is one of main parts of flight.The flapping wing flying is the primaryflight mode of the birds flying,Through the wings on the flutter to using the principle ofaerodynamics,engender the upward lift and to promote the body forward flight thrust.Thegliding flight is another of flight mode,using the wing shape long time glide in air. Thebirds have the shape and structure of feathers, can effectively reduce the resistanceencountered in flight,Differences can make the birds wings with different flightperformance.The birds wings shape can be divided into two categories,One is the large areawide wings in contact with air,Can provide more lift;Another kind is a small resistancenarrow wings during flight,To realize long distance.Comparison of the length and width ofthe birds wings,Wing airfoil configuration,Wing airfoil cross section and feather structuredetermine the efficiency of birds flying height.Therefore the seagull wings as the object ofstudy,seagulls are migratory birds in Europe and Asia,Generalized said seagull is the floorboard of seagulls are more than40species of seabird, the narrow sea seagull is a speciesof seagulls Larus.The seagulls gliding skills perfectly, so-called glider is refers to in the airwith wings and more ascending airflow power,Can support your weight.The seagulls glidingflight speed slow, every hour of the flight speed of only19km, is the speed of the slowestbirds glide,Can skillfully use flow slowly glide, but as long as there is little updraft, isenough to hold it not to drop,it is the special skill to the seagulls.Application of bioniccoupling theory, combined with the biological characteristics of seagull wings, proceed fromthe morphology, structure and other factors, the seagull wings excellent aerodynamicperformance was biological coupling research.This paper first analyzes the characteristics of the seagull wings of feathers, relationshipbetween the seagull wings primaries and secondaries structure and flight characteristics areobtained.seagull wings feather microstructure rachis and pinna consists of elastic and strongpinnae, can reduce the air resistance, increase the bird body buoyancy.Asymmetry of themacro structure of feather seagulls, affected the feather air permeability; primaries andsecondaries have strong hydrophobicity and anisotropy is helpful to reduce the flightresistance.By means of reverse engineering by the method of3D model constitute the seagullwings built, analysis of the impact of seagull wings on the boundary layer flow field byusing the numerical simulation method, analyzed the performance of dynamic seagull wingsgas under different wind speed conditions, found that reached7m/s in the wind speed seagullsingle wings lift reached1.05N, enough make the seagulls fly long distances.Investigate itsreason is mainly the structure and surface streamline seagull wings wings configuration ofthe gas flowing through the wing surface that is not easy to separate, so the seagull wings hasbetter aerodynamic performance.Extraction of the configuration form seagull wings lordosis and bent, in modelingsoftware to construct the lordosis and bent on two kinds of model, the numerical simulationmethod analyzes dynamic performance of two models of gas, two kinds of model caneffectively reduce the gas separation surface, thus reducing the model and the resistance ofthe air.Section airfoil position in seagull wings from the root of20%,30%,40%,50%and60%respectively, the interception of seagull wings, and curve equation was established byusing the least square method of airfoil. And the analysis of the aerodynamic performance ofairfoil, and compared with standard NACA4412, found from the wing airfoil50%hasexcellent aerodynamic performance of airfoil lift increase than the standard35.4%, thelift-drag ratio increases by10%.The seagull wings main coupling airfoil is applied to the wind turbine blade design.Design all the airfoil and part of two kinds of bionic blade airfoil. Two kinds of blades withstandard leaf were compared under different wind speed, found that two kinds of bionic blade relative to the standard leaf efficiency has improved.design and wind turbine blade combination, design a bionic blade improved part ofairfoil bionic blade, all improved the bionic blade airfoil and configuration. By the method ofnumerical simulation analysis found that the bionic blade aerodynamic performance than thestandard blade aerodynamic performance can be improved.