Comparison of modelling approaches and layouts for solar chimney turbines
Comparison of modelling approaches and layouts for solar chimney turbines
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DOI：
10.1016/j.solener.2007.07.006
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发表时间：
2008-03
期刊：
影响因子：
6.7
通讯作者：
T. Fluri;T. V. Backström
中科院分区：
文献类型：
--
作者：
T. Fluri;T. V. Backström
涡轮发电机是任何太阳能烟囱发电厂的核心部件。在文献中已经提出了涡轮发电机的各种布局。在本文中，这些布局的性能进行了比较，使用分析模型和优化技术，并讨论了重要的设计参数。所考虑的涡轮机布局为单转子和反向旋转涡轮机，两者均带有或不带有进口导向叶片。与文献中发现的类似研究相反，在涡轮机模型中分析了沿叶片沿着的各种径向截面。当处理具有高叶片展弦比和低轮毂与叶尖比的涡轮时，这种方法比使用简单的平均线分析更合适。此外，已经引入了对涡轮机的反作用程度的限制，以避免在轮毂处的扩散。本文表明，建模方法的这些微小变化对性能预测有显着影响。进一步可以得出结论，无导叶的单转子布局性能很差;其他三种布局的效率要好得多，并且处于一个狭窄的范围内。反向旋转布局提供了最高的峰值效率，但是在相对低的速度下，这导致对于相同的功率输出的不期望的更高的扭矩。
The turbogenerator is a core component of any solar chimney power plant. Various layouts for the turbogenerator have been proposed in the literature. In this paper the performance of these layouts is compared using analytical models and optimization techniques, and the important design parameters are discussed. The turbine layouts under consideration are single rotor and counter rotating turbines, both with or without inlet guide vanes. In contrast to similar investigations found in the literature, various radial sections along the blades are analysed in the turbine model. This approach is more appropriate than using a simple mean line analysis when dealing with turbines with high blade aspect ratio and low hub to tip ratio. Furthermore, a limit to the degree of reaction of the turbine has been introduced to avoid diffusion at the hub. It is shown in this paper that these slight changes in modelling approach have a significant impact on the performance prediction. Further it can be concluded that the single rotor layout without guide vanes performs very poorly; the efficiency of the other three layouts is much better and lies in a narrow band. The counter rotating layouts provide the highest peak efficiencies, but at relatively low speeds, which leads to an undesirable higher torque for the same power output.