Optimization of Flanged Diffuser for Small-Scale Wind Power Applications

Q2 Mathematics CFD Letters Pub Date : 2024-03-04 DOI:10.37934/cfdl.16.7.5470
Mostafa Radwan Behery, D. H. Didane, B. Manshoor
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Abstract

The development of renewable and clean energy has become more crucial to societies due to the increasing energy demand and fast depletion of fossil fuels. A state-of-the-art design for an augmented wind turbine has been introduced in the past years to increase the efficiency of compact horizontal axis wind turbines, exceeding the ideal Betz’s limit of the maximum energy captured from the wind. The optimization of the flanged diffuser - so-called diffuser augmented wind turbine DAWT - is investigated numerically using the multi-objective genetic algorithm “MOGA”. A 2D computational model is developed using ICEM CFD and solved by ANSYS Fluent. The Turbulence model selected is shear stress transport K-omega, with a pressure-based solver and a coupled algorithm scheme. The optimization objectives are to maximize the velocity ratio at the shroud throat and minimize shroud form dimensions. 517 design points were solved, and the design dimensions were categorized into four types: compact, small, medium, and large design. The results showed that the diffuser dimensions are the main parameters to increase velocity inside the shroud throat, where a long diffuser with a low converging angle drags more air inside the shroud, reaching in some cases more than double the upwind velocity. While the nozzle and flange are also effective in the different design types. It was found that a super long diffuser with a length ratio of 2.9 LD to throat diameter D is optimal with a diverging angle of 7.6˚, accompanied by a nozzle of ratio 1.2 LN/D and 12.6˚ converging angle and a flange length ratio of 0.6 LF/D. This optimal design increased the velocity ratio by almost 2.5 times.
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优化小型风力发电应用中的法兰扩散器
由于能源需求的不断增长和化石燃料的快速枯竭,开发可再生清洁能源对社会变得越来越重要。为了提高紧凑型水平轴风力涡轮机的效率,过去几年中引入了一种最先进的增强型风力涡轮机设计,其最大风能捕获量超过了理想的贝茨极限。使用多目标遗传算法 "MOGA "对法兰扩散器(即扩散器增强型风力涡轮机 DAWT)的优化进行了数值研究。使用 ICEM CFD 开发了一个二维计算模型,并通过 ANSYS Fluent 进行求解。选择的湍流模型是剪应力传输 K-omega,采用基于压力的求解器和耦合算法方案。优化目标是最大化护罩喉部的速度比,最小化护罩外形尺寸。求解了 517 个设计点,并将设计尺寸分为四种类型:紧凑型、小型、中型和大型设计。结果表明,扩散器尺寸是提高护罩喉部内速度的主要参数,其中,低收敛角的长扩散器可将更多空气拖入护罩内,在某些情况下可达到上风速度的两倍以上。喷嘴和法兰在不同的设计类型中也很有效。研究发现,长度比为 2.9 LD 的超长扩散器与喉管直径 D 的发散角为 7.6˚,喷嘴比为 1.2 LN/D,收敛角为 12.6˚,法兰长度比为 0.6 LF/D。这种最佳设计将速度比提高了近 2.5 倍。
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来源期刊
CFD Letters
CFD Letters Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
3.40
自引率
0.00%
发文量
76
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