CAJ | 학술논문

利用商用CFD软件和S-A湍流模型,对风力机常用的NREL S809翼型在不同覆冰形态、覆冰厚度下的静态流场和动态流场进行了数值计算,得到了Re=1×106时各种覆冰情况下该翼型的气动性能,并研究了不同的覆冰形态对风力机翼型静态、动态失速特性的影响.结果表明：向吸力面生长的覆冰形态会造成覆冰层后的分离涡,随着攻角的增加分离涡向后缘生长,造成升力系数的较大下降,阻力系数增加;沿弦向生长的覆冰对尾缘分离涡的生成影响较小;在动态失速情况下,翼型周围流场比较复杂,覆冰形态对翼型升力系统的影响规律也较复杂;从静态流场特性分析,覆冰破坏了翼型的流线从而直接影响了翼型的气动性能;从动态流场特性分析,覆冰改变了翼型动态升力系数曲线的斜率从而影响到风力机的气动弹性稳定性.
이용상용CFD연건화S-A단류모형,대풍력궤상용적NREL S809익형재불동복빙형태、복빙후도하적정태류장화동태류장진행료수치계산,득도료Re=1×106시각충복빙정황하해익형적기동성능,병연구료불동적복빙형태대풍력궤익형정태、동태실속특성적영향.결과표명：향흡력면생장적복빙형태회조성복빙층후적분리와,수착공각적증가분리와향후연생장,조성승력계수적교대하강,조력계수증가;연현향생장적복빙대미연분리와적생성영향교소;재동태실속정황하,익형주위류장비교복잡,복빙형태대익형승력계통적영향규률야교복잡;종정태류장특성분석,복빙파배료익형적류선종이직접영향료익형적기동성능;종동태류장특성분석,복빙개변료익형동태승력계수곡선적사솔종이영향도풍력궤적기동탄성은정성.
Numerical calculation had been performed for static and dynamic flow field of NREL S809 airfoils that are commonly used by wind turbines,using commercial CFD software and S-A turbulent model under different icing conditions,aerodynamic performance of the airfoil was obtained at Re=1×106,influence of icing pattern on the static and dynamic stall of airfoil were analyzed.Results show that the icing extended toward suction surface will generate separation vortex following the icing layer;with the rise of attack angle,the separation vortex grows toward the rear edge,resulting in great reduction of lift coefficient and increase of drag coefficient.The icing extended along chord direction affects little on the formation of rear separation vortex.Under dynamic stall conditions,the flow field around airfoil is relatively complex,the influence of icing pattern on the lift coefficient is also complicated.Analysis results indicate that from the view of static flow field characteristics,icing breaks the streamline of airfoil,which subsequently affects its aerodynamic performance,whereas from the view of dynamic flow field characteristics,icing changes the dynamic lift coefficient,and accordingly influences the stability of turbine＇s aero-elasticity.