Prediction of Performance of a Variable-Pitch Axial Fan with Forward-Skewed Blades

Ye, Xuemin; Fan, Fuwei; Zhang, Ruixing; Li, Chunxi

doi:10.3390/en12122353

Cited by 9 publications

(5 citation statements)

References 35 publications

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“…Twisted blades are widely used in rotating fluid machinery, especially wind turbine blades [24] and tidal-current turbine blades [1]. Since twisted blades can effectively reduce the axial drag coefficient of wind-turbine and tidal-energy-turbine-blade groups and improve the power and energy-conversion efficiency [25], this paper designed the passive morphing blade according to the twisted blade.…”

Section: Structure Of Passive Morphing Bladesmentioning

confidence: 99%

Design and CFD Analysis of the Energy Efficiency of a Point Wave Energy Converter Using Passive Morphing Blades

Wang

Luo

et al. 2022

Energies

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A wave energy converter features the ability to convert wave energy into the electrical energy required by unmanned devices, and its energy-conversion efficiency is an essential aspect in practical applications. This paper proposes a novel point-absorption wave energy converter with passive morphing blades to meet the demand for improved energy-conversion efficiency. We first introduce its concept and design, with its blades forming their shape by adaptive changes with the direction of the water flow. Next, the three-dimensional geometrical-morphing model, energy-conversion model, and energy-conversion-efficiency model of the wave energy converter were established. Then, the CFD model was built to optimize the design parameters, and the simulation results revealed that the maximum conversion efficiency can be obtained at 90% solidity with 10 blades, a 40–60% load, and 20~25 degrees for the external deflection angle. The simulations also showed that the passive morphing-blade group provides ~40% higher torque and ~60% higher hydraulic efficiency than the flat-blade group.

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Section: Structure Of Passive Morphing Bladesmentioning

confidence: 99%

Design and CFD Analysis of the Energy Efficiency of a Point Wave Energy Converter Using Passive Morphing Blades

Wang

Luo

et al. 2022

Energies

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“…This means minimizing any disruptions or irregularities in the flow as it exits the rotor. Recent research has provided evidence that the use of sweeping blades can aerodynamically redistribute the spanwise front loading, leading to notable improvements in reducing tip leakage and minimizing flow separation [12,13]. Failing to address these issues could allow the disturbances to persist in the ducting ahead.…”

Section: Introductionmentioning

confidence: 99%

Implementation of New Design Concepts to An Axial Compressor and A Case Study with CFD

Özdemir,

Gunaydin

2023

AAES

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The present study elaborates on new concepts in designing an axial flow compressor. With the help of an innovative in-house design code, a rotor design is obtained. CFD was used to explore the level of achievement in the performance of the device with the new attributes. In that, the features including local angle of attack, chord length, camber, and thickness were radially adjusted to fulfil flow rate and pressure head requirements at a specific rotational speed, hub, and tip diameters. At the core of this methodology lies the effective use of a lookup table that interrelates airfoil shapes to their corresponding lift coefficients. The most important outcome was the machine attaining the endurance to stall. Furthermore, the rotor geometry is optimized so that the maximum efficiency coincides with the design point of the device, where a low-pitch air motion with a uniform pressure was observed downstream of the rotor, inducing improved aerodynamic conditions. This leads to the minimization of the tangential stresses, and the level of turbulence remained consistently below 15%, signifying a controlled and efficient flow environment. This research expands the understanding of compressor dynamics and offers a practical design methodology, promising increased operational stability and performance across diverse applications.

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“…Numerical models are developed on the basis of these experimental results, but only for specific cases. Researchers have made significant efforts regarding the complex research of the axial fans and their applications in various systems [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Turbulence Structure and Dynamics Investigation of Turbulent Swirl Flow in Pipe Using High-Speed Stereo PIV Data

Čantrak

Janković

2022

Energies

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Turbulent swirl flow, which exists in numerous turbomachinery systems, is the focus of this paper. It consumes a significant amount of energy, so it is a subject of investigation for many researchers. It is even more present in ventilation systems, as numerous axial fans are still installed without guide vanes. The experimental investigation of the turbulent swirl flow behind an axial fan in a pipe, installed in a test rig with a free inlet and ducted outlet, as defined in the international standard ISO 5801, is presented in this paper. Moreover, in this paper, the axially restricted case is studied. A designed axial fan generates a Rankine vortex with a complex structure, and research on the vortex turbulence structure and dynamics is presented. On the basis of the HSS PIV (high-speed stereo particle image velocimetry), measurement results are calculated using invariant maps. All states of turbulence anisotropy are thoroughly analyzed by applying the invariant theory on HSS PIV results. Vortex dynamics is observed on the basis of the total velocity minima positions and their repetitions. Both methods are correlated, and important conclusions regarding vortex behavior are deduced.

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Prediction of Performance of a Variable-Pitch Axial Fan with Forward-Skewed Blades

Cited by 9 publications

References 35 publications

Design and CFD Analysis of the Energy Efficiency of a Point Wave Energy Converter Using Passive Morphing Blades

Design and CFD Analysis of the Energy Efficiency of a Point Wave Energy Converter Using Passive Morphing Blades

Implementation of New Design Concepts to An Axial Compressor and A Case Study with CFD

Turbulence Structure and Dynamics Investigation of Turbulent Swirl Flow in Pipe Using High-Speed Stereo PIV Data

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