Numerical and experimental study on flow separation control of airfoils with various leading-edge tubercles

Fan, Menghao; Dong, Xiangwei; Li, Zengliang; Sun, ZhengMing; Lin, Feng

doi:10.1016/j.oceaneng.2022.111046

Cited by 16 publications

(5 citation statements)

References 35 publications

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“…• Tonal noise is reduced by a large amplitude and a small wavelength A s = 0.11c-0.43c Re = 120.000 [31] NACA 4415 turbine blades CFD λ s = 0.1c • The blades operating in the deep-stall region exhibit smallscale vortices caused by the flow separation on the suction side A s = 0.2c Re = 50.000 [32] NACA 4415 CFD λ s = 0.025c A s = 0.25c Re = 183.000…”

Section: Flow Control Using Sinusoidal Leading Edgesmentioning

confidence: 99%

Design of Sinusoidal Leading Edge for Low-Speed Axial Fans Operating under Inflow Distortion

Tieghi,

Delibra,

Van der Spuy

et al. 2024

Energies

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Axial fans may be equipped with passive flow control devices to enhance rotor efficiency or minimize noise emissions. In this regard, blade designs influenced by biomimicry, such as rotors with sinusoidal leading edges (LEs), have gained popularity in recent years. However, their design is predominantly driven by a trial-and-error approach, with limited systematic studies on the influence of rotor performance. Furthermore, their effectiveness is typically evaluated under controlled conditions that may significantly differ from operations in real installation layouts. In this work, a systematic review of the design process for sinusoidal LE axial fan rotors is provided, aiming to summarize previous design experiences. Then, a modified sinusoidal LE is designed and fitted to a 7.3 m low-speed axial fan for air-cooled condensers (ACCs). These fans operate at environmental conditions, providing a quasi-zero static pressure rise, often with inflow non-uniformities. A series of RANS computations were run to simulate the performance of the baseline fan and that of the sinusoidal leading edge, considering a real installation setup at Stellenbosh University, where the ACC is constrained between buildings and has a channel running on the ground below the fan inlet. The aim is to explore the nonbalanced inflow condition effects in both rotor geometries and to test the effect of the installation layout on fan performance. The results show that the modification to the rotor allows for a more even distribution of flow in the blade-to-blade passages with respect to the baseline geometry.

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Section: Flow Control Using Sinusoidal Leading Edgesmentioning

confidence: 99%

Design of Sinusoidal Leading Edge for Low-Speed Axial Fans Operating under Inflow Distortion

Tieghi,

Delibra,

Van der Spuy

et al. 2024

Energies

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“…The study provides guidelines for selecting tubercle parameters at different TSRs and emphasizes the importance of considering both performance enhancement and economic aspects in the design process. In their study, Fan et al [158] conducted a comprehensive hydrodynamic analysis of airfoils with leading-edge tubercles, inspired by humpback whales, at a Reynolds number of Re = 5 × 10 5 . The application of leading-edge protuberances on the humpback whale's pectoral fin to improve the aerodynamic performance of wind turbines was investigated by Lin et al [159].…”

Section: Humpback Whalesmentioning

confidence: 99%

Nature-Inspired Designs in Wind Energy: A Review

Omidvarnia,

Sarhadi

2024

Biomimetics

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The field of wind energy stands at the forefront of sustainable and renewable energy solutions, playing a pivotal role in mitigating environmental concerns and addressing global energy demands. For many years, the convergence of nature-inspired solutions and wind energy has emerged as a promising avenue for advancing the efficiency and sustainability of wind energy systems. While several research endeavors have explored biomimetic principles in the context of wind turbine design and optimization, a comprehensive review encompassing this interdisciplinary field is notably absent. This review paper seeks to rectify this gap by cataloging and analyzing the multifaceted body of research that has harnessed biomimetic approaches within the realm of wind energy technology. By conducting an extensive survey of the existing literature, we consolidate and scrutinize the insights garnered from diverse biomimetic strategies into design and optimization in the wind energy domain.

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“…However, Jabbari et al [27], by employing static roughness elements, significantly improved the performance of these unconventional wing configurations. The aerodynamic performance of varying leading-edge tubercle configurations was numerically [28,29] and experimentally [30] evaluated, indicating that a larger tubercle amplitude leads to gentler stall, while a smaller tubercle wavelength improves maximum lift. The application of this distinctive feature has recently extended into the realm of water turbine design [31][32][33].…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Investigating Mechanical Response and Structural Integrity of Tubercle Leading Edge under Static Loads

Esmaeili,

Jabbari,

Zehtabzadeh

et al. 2024

Modelling

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This investigation into the aerodynamic efficiency and structural integrity of tubercle leading edges, inspired by the agile maneuverability of humpback whales, employs a multifaceted experimental and computational approach. By utilizing static load extensometer testing complemented by computational simulations, this study quantitatively assesses the impacts of unique wing geometries on aerodynamic forces and structural behavior. The experimental setup, involving a Wheatstone full-bridge circuit, measures the strain responses of tubercle-configured leading edges under static loads. These measured strains are converted into stress values through Hooke’s law, revealing a consistent linear relationship between the applied loads and induced strains, thereby validating the structural robustness. The experimental results indicate a linear strain increase with load application, demonstrating strain values ranging from 65 με under a load of 584 g to 249 με under a load of 2122 g. These findings confirm the structural integrity of the designs across varying load conditions. Discrepancies noted between the experimental data and simulation outputs, however, underscore the effects of 3D printing imperfections on the structural analysis. Despite these manufacturing challenges, the results endorse the tubercle leading edges’ capacity to enhance aerodynamic performance and structural resilience. This study enriches the understanding of bio-inspired aerodynamic designs and supports their potential in practical fluid mechanics applications, suggesting directions for future research on manufacturing optimizations.

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Numerical and experimental study on flow separation control of airfoils with various leading-edge tubercles

Cited by 16 publications

References 35 publications

Design of Sinusoidal Leading Edge for Low-Speed Axial Fans Operating under Inflow Distortion

Design of Sinusoidal Leading Edge for Low-Speed Axial Fans Operating under Inflow Distortion

Nature-Inspired Designs in Wind Energy: A Review

Investigating Mechanical Response and Structural Integrity of Tubercle Leading Edge under Static Loads

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