Aerodynamic blockage and tip-loss effects in a multi-rotor vertical axis wind turbine system

多旋翼垂直轴风力发电机系统中的气动阻塞和叶尖损失效应

• 批准号: 2513207
• 金额: --
• 依托单位: University of Strathclyde
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2513207
• 关键词: Aerodynamic; blockage; tip; loss; effects

A novel multi-rotor system (MRS) has been proposed by Peter Jamieson. The design features a column of four 500kW Darrieus H-type vertical axis turbines atop each other, of high aspect ratio (5:1) and 45 degrees out of phase. 24 of these columns will be placed alongside each other, counter-rotating and in groups of four, with structural support between groups and around the whole system.The system may have many benefits. The out-of-phase VAWTs will smooth the torque experienced. For 96 turbines, only 24 generators will be required. Choosing symmetrical blades will allow VAWT units to rotate either direction simply by fitting upside-down. The counter-rotation will have energy production benefits from wake effects, and reduce the net torque on the overall system. The modular nature will ease production, and allow much of the turbine to continue operating should one turbine fail. Neither local nor global yawing will be present, and the system is expected to be floating on a tri-floater. The work of this PhD will be on blockage and tip loss effects. A power increase is expected from aerodynamic blockage effects, perhaps enhanced by the rotors of a VAWT passing the wind twice. It should also be enhanced by the support structure causing further flow concentration, as it is in-line with the rotors, rather than behind them like a HAWT MRS. A guideline on how best to optimise power enhancement will be produced.The high aspect ratio is likely to reduce tip loss significance, however there are additional complexities from the interaction of tip loss vortices from above/beneath and on one/two sides. Time permitting, wake effects may be briefly analysed.

一种新型的多转子系统（MRS）已经由Peter Jamieson提出。该设计的特点是一列四个500千瓦的达里厄H型垂直轴涡轮机相互堆叠，高纵横比（5：1）和45度异相。其中24根柱子将并排放置，反向旋转，并以四根为一组，在组之间和整个系统周围提供结构支撑。异相VAWT将平滑所经历的扭矩。96台涡轮机只需要24台发电机。选择对称的叶片将允许VAWT单位旋转任何方向简单地安装颠倒。反向旋转将具有来自尾流效应的能量产生益处，并且减小整个系统上的净扭矩。模块化的特性将简化生产，并允许大部分的涡轮机继续运行，如果一个涡轮机失败。既不存在局部偏航，也不存在全局偏航，预计系统将漂浮在三浮子上。这个博士的工作将是阻塞和尖端损失的影响。功率的增加预计来自气动阻塞效应，可能通过VAWT的转子通过两次风来增强。还应该通过支撑结构来增强功率，因为支撑结构与转子在同一直线上，而不是像HAWT MRS那样在转子后面，从而进一步集中气流。将制定关于如何最佳优化功率增强的指导方针。高展弦比可能会降低叶尖损失的重要性，但是，由于叶尖损失涡流从上方/下方和一侧/两侧相互作用，会产生额外的复杂性。时间允许的话，可以简要地分析尾流效应。