Numerical Study on Fluid Dynamic Characteristics of a Cross-Flow Fan

Cai, Xiaowei; Zhang, Chun; Wang, Baoshou

doi:10.3390/jmse11040846

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…CFFs have gained significant practical applicability across various industries due to their unique design and versatile airflow characteristics. One notable area where CFFs find practical use is in heating, ventilation, and air conditioning (HVAC) systems [20,[22][23][24]. The compact size and ability to produce a laminar and evenly distributed airflow make CFFs suitable for applications such as air circulation in buildings, cooling electronic components, and maintaining consistent temperatures in enclosed spaces.…”

Section: Fundamentals and Applications Of Cffsmentioning

confidence: 99%

Performance and Efficiency of Cross-Flow Fans—A Review

Vanaei,

Khelladi,

Dobrev

et al. 2023

Energies

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Cross-Flow Fans (CFFs) have been widely applied in the automotive and domestic air conditioning industries in recent decades. They are high-pressure coefficient turbomachines compacted diametrically, and thus, the complex interactions of these fans require thorough evaluation. Their innovation has opened up new directions in turbomachinery, and both academic research and industry have seen numerous efforts to develop these types of fans. Despite extensive work, optimizing and improving their performance remains a challenge. Enhancing their efficiency necessitates improvements in structural characteristics, aerodynamic features, and acoustic properties. In this review, we aim to demonstrate the essential aspects of CFFs by introducing their fundamentals and primary characteristics. Furthermore, we delve into a discussion on the acoustic performance of these fans. We also summarize the flow characteristics and different flow-field patterns in CFFs and their impact on aeroacoustic behavior. The main objective of this review paper is to provide an overview of the research in this field, summarizing the critical factors that play a significant role in studying CFFs’ performance.

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Section: Fundamentals and Applications Of Cffsmentioning

confidence: 99%

Performance and Efficiency of Cross-Flow Fans—A Review

Vanaei,

Khelladi,

Dobrev

et al. 2023

Energies

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“…CFF rotors have a distinctive large length-to-diameter ratio and consist of several thin blades arranged in a circular manner to achieve the optimal fluid dynamic performance [7][8][9]. The long and thin blades result in a low mechanical bending stiffness.…”

Section: Introductionmentioning

confidence: 99%

Supercritical Operation of Bearingless Cross-Flow Fan

Bagaric,

Steinert,

Nussbaumer

et al. 2024

Machines

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This paper presents a decoupled bearingless cross-flow fan (CFF) that operates at a supercritical speed, thereby increasing the maximum achievable rotational speed and fluid dynamic power. In magnetically levitated CFF rotors, the rotational speed and fan performance are limited by the bending resonance frequency. This is primarily defined by the low mechanical bending stiffness of the CFF blades, which are optimised for fluid dynamic performance, and the heavy rotor magnets on both rotor sides, which add significant mass but a minimal contribution to the overall rotor stiffness. This results in detrimental deformations of the CFF blades in the vicinity of the rotor bending resonance frequency; hence, the CFF is speed-limited to subcritical rotational speeds. The novel CFF rotor presented in this study features additional mechanical decoupling elements with low bending stiffness between the fan blades and the rotor magnets. Thus, the unbalance forces primarily deform the soft decoupling elements, which enables them to pass resonances without CFF blade damage and allows rotor operation in the supercritical speed region due to the self-centring effect of the rotor. The effects of the novel rotor design on the rotor dynamic behaviour are investigated by means of a mass-spring-damper model. The influence of different decoupling elements on the magnetic bearing is experimentally tested and evaluated, from which an optimised decoupled CFF rotor is derived. The final prototype enables a stable operation at 7000 rpm in the supercritical speed region. This corresponds to a rotational speed increase of 40%, resulting in a 28% higher, validated fluid flow and a 100% higher static pressure compared to the previously presented bearingless CFF without decoupling elements.

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“…Grasping the dynamics of liquids and gases, perceiving their behavior, and knowing how to enhance and improve them all require a grasp of the characteristics of fluids and heat transfer [1][2][3][4][5][6][7]. Also, Improvements in fluid characteristics and heat transfer brought about using nanotechnology have had a big impact on the fields of energy, medicine, agriculture, materials, industry, and many other applications [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of a Vertical Wind Turbine using Plastic Blades

Kadhim Fadhil Nasir,

Rozli Zulkifli,

Hassan Ali Jurmut

et al. 2024

ARFMTS

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It had presented for current investigation the powered performance of H vertical wind turbines for wind speed of (1, 2, 3, 4, 5, 6, 7, 8) m/s region in Al-Mussaib city-Iraq, located at 3205' North latitude and 4403' East longitude. The Experimental test rig includes H vertical wind turbine which configured and made-up in order to analyze the effect of different ambient and wind speed variable conditions on the powered performance of H typre vertical wind turbine which consists of blades which are made from plastics. The turbine blades are designed from plastic strips with a thickness of 3 mm, each part is along 50 cm in diameter, 16 cm in diameter, and the number of blades used in this experiment is six blades to form required turbine. The experiments were tested outdoor at Technical College in AL-Mussaib city-Babylon-Iraq for a period of March and April 2022. The results showed that the power output, with wind speed of minimum value 1 m/s generate 5 Watts, while with wind speed of maximum value 7 m/s generate 100 Watts. Also, the power output, with turbine rotational speed of minimum value 100 rpm generate 8 Watts, while with turbine rotational speed of maximum value 1000 rpm generate 120 Watts. Moreover, the power output, with turbine elevation of minimum value 7 m generate 100 Watts, while with turbine elevation of maximum value 21 m generate 250 Watts.

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Numerical Study on Fluid Dynamic Characteristics of a Cross-Flow Fan

Cited by 4 publications

References 29 publications

Performance and Efficiency of Cross-Flow Fans—A Review

Performance and Efficiency of Cross-Flow Fans—A Review

Supercritical Operation of Bearingless Cross-Flow Fan

Experimental Analysis of a Vertical Wind Turbine using Plastic Blades

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