CAJ | 학술논문

基于状态空间描述的Beddoes-Leishman动态失速模型,对风力机翼型进行非定常气动力分析.考虑到风力机翼型工作时的实际情况,在模型中忽略了可压缩性效应和起始于翼型前缘的流动分离.模型考虑了气流的近尾流效应和在失速区域的后缘分离效应.模型用4个气动状态来描述非定常气动力系数动力学,其中两个用于描述近尾流效应中的时间迟滞,另两个用于描述后缘分离效应.采用模型对做简谐变桨运动的FFA-W3-241风力机专用翼型进行了非定常气动力分析.数值计算结果与实验值吻合良好,说明模型能较好地描述风力机翼型的非定常气动特性.将动态失速数值计算模块与已有的风力机气动与结构分析软件集成,利用软件对一台1.5MW变速变桨距风力机的发电工况进行了仿真.仿真结果表明,翼型的非定常气动特性对动态载荷计算结果影响很大,因此在风力机的设计过程中应该予以充分考虑.
기우상태공간묘술적Beddoes-Leishman동태실속모형,대풍력궤익형진행비정상기동력분석.고필도풍력궤익형공작시적실제정황,재모형중홀략료가압축성효응화기시우익형전연적류동분리.모형고필료기류적근미류효응화재실속구역적후연분리효응.모형용4개기동상태래묘술비정상기동력계수동역학,기중량개용우묘술근미류효응중적시간지체,령량개용우묘술후연분리효응.채용모형대주간해변장운동적FFA-W3-241풍력궤전용익형진행료비정상기동력분석.수치계산결과여실험치문합량호,설명모형능교호지묘술풍력궤익형적비정상기동특성.장동태실속수치계산모괴여이유적풍력궤기동여결구분석연건집성,이용연건대일태1.5MW변속변장거풍력궤적발전공황진행료방진.방진결과표명,익형적비정상기동특성대동태재하계산결과영향흔대,인차재풍력궤적설계과정중응해여이충분고필.
An unsteady aerodynamics model based on the Beddoes-Leishman type dynamic stall model in a state-space formulation was presented to predict the unsteady aerodynamic forces on an airfoil undergoing arbitrary motion.According to the operating condition of wind turbine airfoils,the compressibility effects and flow separation initiated from the leading edge were neglected.The model includes the effects of near wake and the effects of trailing edge separation.Four aerodynamic states were adopted to describe the dynamics of the unsteady aerodynamic force coefficients: two states were applied to model the time-lag of the near wake effect,and the other two states were used to model the time-lag effect of trailing edge separation.Applying the proposed model,unsteady aerodynamic forces of a FFA-W3-241 wind turbine airfoil during harmonic pitching motion were calculated.The calculation results showed a good agreement with the experimental data,which indicated that the proposed model ould preferably model the unsteady aerodynamic characteristics of wind turbine airfoils.The numerical dynamic stall module was integrated into a wind turbine aerodynamics and structural dynamics analysis software.Applying the software,a simulation of power production load case of a1.5 MW variable-speed pitch-regulated wind turbine was carried out.The simulation results indicate that unsteady aerodynamic characteristics of airfoils shall be taken into account during wind turbine design process because they significantly affect the transient aerodynamic loads of the rotor.