Improved Aerodynamics of a Hollow-Blade Axial Flow Fan by Controlling the Leakage Flow Rate by Air Injection at the Rotating Shroud

Pereira, Michaël; Ravelet, Florent; Azzouz, K.; Azzam, Tarik; Oualli, H.; Kouidri, S.; Bakir, Farid

doi:10.3390/e23070877

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…Literature 12 carries out CFD calculation for a hollow blade fan. The numerical results are consistent with the experimental results, and have been significantly improved in low speed, power (53%), torque (80%) and leakage flow (80%) [12]. In reference 13, the Bezier function is used to parameterize the forward sweep curve at the top of the blade, which improves the aerodynamic performance and efficiency of the forward swept axial flow fan.…”

supporting

confidence: 63%

Intelligent Simulation and Optimization of Axial Flow Fan Based on CFD

zhang¹,

sun²,

he³

et al. 2023

Preprint

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Based on the CFD simulation of the axial flow fan for air conditioning, a flexible and fast deformation model of axial flow fan is established in this paper. The influence of different fan design parameters on the performance of axial flow fan under different working conditions, such as different speed, air volume and pressure, is studied. A set of intelligent optimization platform for axial flow fan is formed and the performance of a certain type of fan is optimized under the working condition of 22000m3/h flow rate.

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supporting

confidence: 63%

Intelligent Simulation and Optimization of Axial Flow Fan Based on CFD

zhang¹,

sun²,

he³

et al. 2023

Preprint

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“…In this regard, Azzam et al [8] experimentally proceeded to reduce the leakage flow for the same rotomolded fan used in the present study, which lead to a gain of 53% of aeraulic power, by injecting air into the clearance gap zone through 16 and 32 holes in the shroud ring circumference. For better understanding of the behavior of this rotomolded fan with its hollow nature and the contribution of the air injection on fan performances, a detailed numerical investigation was carried out by Pereira et al [9] which is considered as continuity of works discussed in [8]. By analyzing entropy contours over the fan, the significant energy dissipations was mainly caused by the tip leakage flow.…”

Section: Htff 125-2mentioning

confidence: 99%

Experimental and Numerical Investigation of Controlled Rotomolded Axial Fan by Internal Air Injection at Gap Clearance

BOUANIK,

LARABI,

AZZAM

et al. 2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

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In the present era, axial fans play a pivotal role in crucial sectors of both industry and research. As a result, significant attention has been directed towards enhancing their aerodynamic performances. The ongoing inquiry is centered around elevating the aeraulic efficiencies of a fan produced through rotational molding techniques. First is adopting an active control by injecting a compressed air through 16 holes placed at the fan's hollow shroud ring of a dimension of 4 mm, by leveraging a benefit that involves in exploiting the hollow nature of the fan with the centrifugal effect. In the other hand, the fan's axial position with respect to the casing was investigated to know its influence on aerodynamics performances. The numerical investigation employing the K-ω SST turbulence model allows a detailed characterization of the flow modification around the fan. Results show that the swirling zone that forms around the shroud ring in investigated axial positions as a result of the interaction of the main and leakage flows with casing walls, has a significant impact on the change of the flow topology. In comparison to the baseline case, the aerodynamic performances are improved as the leakage flow and the swirling zone are both reduced. This improvement is translated into a gain of approximately 53% in aeraulic power and a leakage flow reduction of about 80%.

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“…However, the method of determining the shrinkage of fabricated fans have not mentioned in detail by recent studies in the field of axial fan fabrication (Tarik, 2018;Pereira et al, 2021). The shrinkage of the external fan affects the shape and geometrical dimensions, and it's also related to the profile of the blades.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of axial fan shrinkage obtained by centrifugal casting technology on aerodynamic characteristics

Dang,

Tran,

Doan

et al. 2024

JMES

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Centrifugal casting technology was developed for the application of manufacturing axial fans. In the literature, these fans were usually manufactured by injection molding, mechanical processing or heat pressing. The main characteristic of this molding technology allows the creation of thick and hollow blades. This characteristic of the blades gives useful advantages of the fan that cannot be achieved by conventional methods. The centrifugal casting technology has been applied to fabricate axial fans in recent research. However, the issue of quality control and especially the shrinkage of the resulting fan compared to the molding has not yet been considered. Therefore, more in-depth studies and approaches are required. In this study, 3D scanning method is used to evaluate the shrinkage of the blades. The used 3D scanner is the Comet L3D 5M type based on structured light (blue LED) with a 5-megapixel sensor. This device achieves high accuracy and reliability (resolution 18 μm). The theoretical basis for determining fan shrinkage compared to CAD molds is based on the following main parameters: Chord line L (mm), relative thickness Emax (%), and stagger angle ( (degrees). In addition, the aerodynamic characteristics of the proposed fan are compared to those of a fan made of aluminum (blades are identical, but different in fabricating technology). Characteristics of this aluminum rigid-fan are assumed as reference. The results showed that the difference was not large between the blades. Besides, the results of aerodynamic testing on the test bench of the two fans are almost similar. This indicates the good adaptability of the axial fan received by the centrifugal casting technology.

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Improved Aerodynamics of a Hollow-Blade Axial Flow Fan by Controlling the Leakage Flow Rate by Air Injection at the Rotating Shroud

Cited by 5 publications

References 29 publications

Intelligent Simulation and Optimization of Axial Flow Fan Based on CFD

Intelligent Simulation and Optimization of Axial Flow Fan Based on CFD

Experimental and Numerical Investigation of Controlled Rotomolded Axial Fan by Internal Air Injection at Gap Clearance

Investigating the effect of axial fan shrinkage obtained by centrifugal casting technology on aerodynamic characteristics

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