CAJ | 학술논문

为减小垂直轴阻力型风机叶轮在回程方向的阻力，提出了一种伸缩叶片式垂直轴风机叶轮方案，设计了叶片伸缩机构来控制叶片的径向位置，并给出了叶片的运动规律。为进一步探索该叶轮在工作状况下的力矩、功率特性，采用滑移网格技术对不同叶片数目的叶轮进行了二维计算流体动力学数值计算，并分析了实际工况下压力场的基本特点。结果表明：叶片力矩系数在进程方向为较大正值，而在回程方向保持在0值附近；四叶片叶轮在速比系数为0．4时获得最大平均功率系数0．2449。
위감소수직축조력형풍궤협륜재회정방향적조력，제출료일충신축협편식수직축풍궤협륜방안，설계료협편신축궤구래공제협편적경향위치，병급출료협편적운동규률。위진일보탐색해협륜재공작상황하적력구、공솔특성，채용활이망격기술대불동협편수목적협륜진행료이유계산류체동역학수치계산，병분석료실제공황하압력장적기본특점。결과표명：협편력구계수재진정방향위교대정치，이재회정방향보지재0치부근；사협편협륜재속비계수위0．4시획득최대평균공솔계수0．2449。
In order to reduce the negative torque of drag?type vertical axis wind turbines (VAWTs) in the returning direction, a novel VAWT with retractable blades is proposed. Controlled by a link mechanism, the blades can be entirely hidden in the windshield in the returning direction and negative torques can then be considerably reduced. With the aim of further investigating the torque and power property of the turbine, two?dimensional computational fluid dynamics (CFD) simulations were carried out with a sliding mesh method. The effects of blade number and rotation speed were considered as well. The results and their analysis preliminarily demonstrated that the blade gen?erates nearly no negative torque in the returning direction. The maximum averaged power coefficient is 0. 2449, ob?tained at a flow coefficient of 0. 4.