Investigating the Effect of Geometrical and Dynamic Parameters on the Performance of Darrieus Turbines: A Numerical Optimization Approach via QBlade Algorithm

Abstract

Artan enerji talebi, kişi başına düşen enerji kullanımı, çevresel problemler ve bunlara bağlı diğer olumsuz sonuçlar bilim insanlarını ve mühendisleri yenilenebilir enerji sistemlerinin verimliliği konusunda daha fazla çalışma yapmaya sevk etmiştir. Serbest akışlı (rüzgar ve hidrokinetik) türbinler, üzerinde en çok araştırma yapılan yenilenebilir enerji teknolojileri olup Darrieus türbinleri özellikle küçük ölçekli ve lokal uygulamalarda önemli bir yere sahiptir. Darrieus türbinlerinin performansı hakkında birçok deneysel ve hesaplamalı çalışma yapılmış olmasına rağmen, zaman ve maliyet açısından nispeten çok daha elverişli olan numerik çalışmaların sayısı oldukça sınırlıdır. Bu çalışmanın temel amacı, farklı geometrik ve dinamik konfigürasyonlara sahip Darrieus türbinlerinin QBlade yazılımı kullanılarak analiz edilmesidir. Mevcut çalışmada, düz kanatlı Darrieus türbinlerinden daha yüksek performans elde edilmesi amacı ile kanat profili, kanat kalınlığı, kanat sayısı, kord uzunluğu, solidite ve sarmallığın performansa etkisi analiz edilmiştir. Bu çalışmada NACA 0020 profilinin, dikey eksen türbinlerde diğer simetrik kanat kesitlerine nazaran daha iyi performans gösterdiği bulunmuştur. Üç kanatlı türbinlerin ise daha iyi performans gösterdiği ve daha geniş TSR aralığında çalıştığı sonucuna varılmıştır. Ayrıca, kord uzunluğu arttıkça maksimum güç katsayısına daha düşük uç hız oranında (TSR) ulaşıldığı tespit edilmiştir. Bu çalışmanın hem rüzgâr hem de hidrokinetik uygulamalar için farklı boyut ve dinamik ölçeklere sahip Darrieus türbini tasarımı çalışmalarına katkıda bulunması beklenmektedir.

Keywords

• QBlade,sayısal,düz kanatlı,Darrieus,TSR,Solidite,Sarmallık

Investigating the Effect of Geometrical and Dynamic Parameters on the Performance of Darrieus Turbines: A Numerical Optimization Approach via QBlade Algorithm

Abstract

Increasing energy demand, rising per capita energy use, growing climate problems and other detrimental consequences of energy and environmental issues have prompted scientists and engineers to conduct more studies on the technical feasibility and efficiency of renewable energy conversion systems. Free flow (wind and hydrokinetic) turbines are one of the mostly investigated renewable energy technologies and Darrieus turbines have an exceptional place especially for smaller scale and domestic applications. Many experimental and computational studies have been provided on the performance of Darrieus turbines. However, the number of numerical studies which are more time and cost effective than computational and experimental works are quite limited in the literature. The main objective of this study is to analyze Darrieus turbines at different geometrical and dynamic configurations using numerical QBlade software. In this study, the effect of airfoil selection, thickness, number of blades, chord length, solidity and helicity are analyzed in terms of delivering higher performance at straight bladed Darrieus turbines. It has been found that NACA 0020 profile performs better relative to other symmetrical blade sections in vertical axis turbines. Better performance and wider TSR range is obtained for three bladed turbines. Also, increasing chord lengths delivered maximum power at lower tip speed ratio (TSR) ranges. This study is expected contribute site-dependent Darrieus turbine design works at different dimension and dynamic scales for both wind and hydrokinetic applications.

Keywords

• QBlade,numerical,H-shaped,Darrieus,TSR,solidity,helicity

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