识别有价值顾客及无价值顾客.doc

识别有价值顾客及无价值顾客 - 1 - 中国科技论文在线 水平轴风力机非线性尾流模型的研究# 杨瑞，张升龙，王久鑫，夏巍巍* 基金项目：教育部博士点基金项目(项目编号：20106201120001) ；教育部博士点新教师基金项目(项目编 号：20106201120001) 作者简介：杨瑞（198），男，副教授，主要研究风力机空气动力学特性 （兰州理工大学能源与动力工程学院，兰州 #004699730050） 5 摘要：现有的线性尾流（圆柱流面）模型，将转轮看作是由数目无限多弦长无限小的叶片所 组成的“制动圆盘”，没有考虑叶片展向的变环量分布和诱导速度的展（径）向分量，认为 从叶片尾缘脱落的各尾涡束都位于各自的圆柱面上，这显然与实际观察到的尾涡结构不符。 从而提出了“非线性”尾迹模型，该模型将转轮后的尾流旋涡系分为沿转轮轴的中心涡、沿 叶片轴的附着涡和从叶片尾缘处脱落且伸展到无限远处的尾涡系。在该模型下使用10 Biot-Savart 定律推导出各旋涡系诱导速度的积分方程。 关键词：水平轴风力机；尾流模型；诱导速度；积分方程 中图分类号：TK83 Reseach of The Nonlinear Wake Model of Horizontal Axis 15 Wind Turbine Yang Rui, Zhang Shenglong, Wang Jiuxin, Xia Weiwei (School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou #004699730050) Abstract: In the existing linear wake (cylindrical surface) model of horizontal axis wind turbines, the rotor was taken as the actuator-disc composed of infinite blades with infinitesimal chords. The 20 distribution of variable circulation along blade was not taken into account and the span-wise (or radial) component of induced velocity is totally ignored. And assumed that the all trailing vortex filament shed from blade trailing edge would locate on their own cylindrical stream-surface. This aerodynamic model for determination of wake configuration is obviously different from that actually observed wake in wind tunnel experiment. Therefore, a ;nonlinear; wake model was 25 proposed, in this model the wake vortex system was divided into the central vortex along rotor axis, the bound vortex along blade axis, the wake vortex sheets shed from blade trailing edge and extent into infinity behind the rotor. Then, on the basis of potential theory in fluid mechanics a set of integral equations for evaluation of induced velocity in wake were derived with Biot-Savart’s formula. 30 Key words: horizontal axis wind turbines;wake model;induced velocity; integral equation 0 引言 风力机的涡尾结构对风力机气动性