Numerical Study of Control Rod's Cross-Section Effects on the Aerodynamic Performance of Savonius Vertical Axis Wind Turbine with Various Installation Positions at Suction Side

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Iranian Journal of Science and Technology-Transactions of Mechanical Engineering Pub Date : 2024-04-21 DOI:10.1007/s40997-024-00770-1

Mohammad Akhlaghi, Seyed Reza Mirmotahari, Farzad Ghafoorian, Mehdi Mehrpooya

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Abstract

The substantial rise in atmospheric pollutants attributed to the use of fossil fuels has driven the development of renewable energy sources as a burgeoning industry. Subsequently, amidst the ongoing quest for sustainable energy sources, wind energy has emerged as a reliable alternative. This has resulted in the development of various types of wind turbines. One of the most common types of vertical axis wind turbines is Savonius VAWTs. Despite possessing advantages, these turbines are less efficient compared to others. However, this shortcoming can be remedied by enhancing the aerodynamic performance of the turbines. This two-dimensional study examined the impact of placing an external object as a control rod at the rotor upstream or on the suction side by computational fluid dynamic methods. The rod was designed with circular, oval, dimpled, and bumpy cross-sections. The study evaluated different stagger angles for various diameter and distance ratios. The results showed that using a circular cross-section at a stagger angle = 30°, S/D = 1.5 and D/d = 2 increased efficiency by 40%. Implementing an oval cross-sectional design with stagger angle = 60° and S/D = 1 enhanced the rotor's efficiency to 90%. Using a bumpy cross-section yielded a jump in efficiency and expanded the operating range of the Savonius VAWT up to a tip speed ratio of 0.8.

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控制杆横截面对吸气侧不同安装位置的萨沃尼乌斯垂直轴风力发电机空气动力性能影响的数值研究

化石燃料的使用导致大气污染物大幅增加，推动了可再生能源作为新兴产业的发展。随后，在对可持续能源的不断探索中，风能已成为一种可靠的替代能源。因此，各种类型的风力涡轮机应运而生。最常见的垂直轴风力涡轮机类型之一是萨沃尼尔斯 VAWT。尽管具有优势，但与其他风机相比，这些风机的效率较低。不过，可以通过提高涡轮机的空气动力性能来弥补这一不足。这项二维研究通过计算流体动力学方法，考察了在转子上游或吸入侧放置外部物体作为控制杆的影响。控制棒的横截面有圆形、椭圆形、凹凸形。研究评估了不同直径和距离比的不同交错角。结果表明，在交错角 = 30°、S/D = 1.5 和 D/d = 2 的条件下使用圆形截面，效率提高了 40%。采用椭圆形横截面设计，交错角 = 60°，S/D = 1，转子效率提高到 90%。采用凹凸横截面使效率跃升，并将 Savonius VAWT 的工作范围扩大到 0.8 的顶端速比。

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来源期刊

Iranian Journal of Science and Technology-Transactions of Mechanical Engineering ENGINEERING, MECHANICAL-

CiteScore

2.90

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： Transactions of Mechanical Engineering is to foster the growth of scientific research in all branches of mechanical engineering and its related grounds and to provide a medium by means of which the fruits of these researches may be brought to the attentionof the world’s scientific communities. The journal has the focus on the frontier topics in the theoretical, mathematical, numerical, experimental and scientific developments in mechanical engineering as well as applications of established techniques to new domains in various mechanical engineering disciplines such as: Solid Mechanics, Kinematics, Dynamics Vibration and Control, Fluids Mechanics, Thermodynamics and Heat Transfer, Energy and Environment, Computational Mechanics, Bio Micro and Nano Mechanics and Design and Materials Engineering & Manufacturing. The editors will welcome papers from all professors and researchers from universities, research centers, organizations, companies and industries from all over the world in the hope that this will advance the scientific standards of the journal and provide a channel of communication between Iranian Scholars and their colleague in other parts of the world.