Method for modifying axial fan’s guard grill and its impact on operating characteristics

Alic, Gregor; Širok, B.; Hočevar, Marko

doi:10.1007/s10010-010-0118-z

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…The main sources of total measurement uncertainty were: the uncertainty of measuring rotational frequency, air volume flow rate, pressure difference, temperature correction, humidity, uncertainty of power measurement, pressure and velocity fluctuations, motor efficiency measurements, etc. [16,17,35,36]. According to the standard, it was estimated that overall measuring uncertainty amounts to 2.8% of the measured value for static pressure and 3.0% for aerodynamic efficiency [16,17,34,37].…”

Section: Measurements Of Integral Aerodynamic Characteristicsmentioning

confidence: 99%

Aerodynamic and acoustic integral characteristics of porous rotors

Benedik

Širok

Eberlinc

et al. 2011

Forsch Ingenieurwes

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This paper describes porous rotors manufactured from open cell aluminium foam. Rotor construction and theoretical description of fluid flow through rotating porous material are presented. Nine porous rotors made of materials with three different average pore sizes, with or without inducer, three rotor heights and two inlet diameters were selected and compared to a classical rotor with blades. Measurements involved two parts, measurement of pressure drop on non-rotating rotors while integral flow characteristics were measured on rotating rotors. Pressure drops for selected rotors agree well with theoretically calculated values based on Darcy-Forchheimer equation and Ergun equation. Measurements of integral aerodynamic and acoustic characteristics for selected rotors are presented. At low volume flow rates porous rotors have lower aerodynamic efficiency, comparable dimensionless pressure and lower noise compared to classical rotors with blades.

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Section: Measurements Of Integral Aerodynamic Characteristicsmentioning

confidence: 99%

Aerodynamic and acoustic integral characteristics of porous rotors

Benedik

Širok

Eberlinc

et al. 2011

Forsch Ingenieurwes

Self Cite

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“…Many reports have been made on the improvement of fan efficiency experimentally and numerically using Computational Fluid Dynamics (CFD), and efficiency has been improved by optimizing the shape of the grill located in the wake of the fan [1]. In addition, there are many reports related to the improvement of fan efficiency, such as the existence of obstacles that affect the P-Q characteristics of the fan [2] and the consideration of the inlet size into which airflow flows [3].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic performances and efficiency of axial flow fan placed in cooling system

Kawano¹,

Fuchiwaki

2022

J. Phys.: Conf. Ser.

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One way to reduce the aerodynamic noise generated by the cooling system of construction machinery is to improve the fan efficiency and then drive the cooling fan at a lower speed. Computational Fluid Dynamics (CFD) is effective for clarifying the mechanisms of the fan efficiency, but there are few reports that capture the flow field around the axial fan blades installed in the cooling system of construction machinery, that is, in a high static pressure environment. Moreover, from the viewpoint of the three-dimensional flow field, the fan efficiency has not been sufficiently studied. In this study, the flow field of the entire cooling system including an axial cooling fan was visualized by numerical simulation using ANSYS-CFX17.0, and the effect of the flow field formed around the blades on the fan efficiency was investigated. In case of a single axial fan, increase or decrease in pressure caused by airflow collision or separation is higher than the entire cooling system. As a result, the loss becomes large. In addition, the increase in loss due to collision or separation occurs regardless of the blade span length, and its magnitude is proportional to the circumferential velocity at each point of the blade except for the blade tip.

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“…Since the flow rate generated by the fan is determined by the fan pressure-flow rate (P-Q) characteristics and the cooling system impedance, numerous studies have examined improvements to axial fan P-Q characteristics. For example, it has been reported that P-Q characteristics are significantly affected by the fan grill configuration (Alič et al, 2010), the presence of obstacles in the vicinity (Nakamura, 2010), and the area of the housing inlet where the fan is mounted (Fukue et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Pressure drop mechanisms in a cooling system enclosure

Kawano

Fuchiwaki

2022

JFST

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A potential way to reduce the noise generated by construction machinery cooling systems is to satisfy the flow rate required for cooling at lower fan speeds, and a promising approach to achieving this goal involves finding ways to reduce the pressure drop that occurs in the cooling system ventilation passages. Towards that end, approaches using computational fluid dynamics (CFD) have proven effective for estimating three-dimensional (3D) spatial pressure drops, but there have been few reports on actual loss mechanisms. In this study, the mechanisms of pressure drops that occur inside a cooling system enclosure and around exhaust port vents were investigated by capturing the flow discharged by the axial fan within the enclosure into the atmosphere via the exhaust port. We found that portions of the fan outlet flow divert significantly inside the enclosure and are exhausted at exhaust port outlets located some distance away from the fan. We also found that the pressure drops in such locations are larger than experienced by flow discharged via the shortest path. Since flows within the enclosure collide with each other and become unsettled around the exhaust port, turbulent kinetic energy increases, thus intensifying the pressure drop. Hence, by expelling the flow at the exhaust port via the shortest path without allowing it to mix chaotically inside the enclosure, the flow rate can be increased using the same fan speed.

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Method for modifying axial fan’s guard grill and its impact on operating characteristics

Cited by 8 publications

References 14 publications

Aerodynamic and acoustic integral characteristics of porous rotors

Aerodynamic and acoustic integral characteristics of porous rotors

Aerodynamic performances and efficiency of axial flow fan placed in cooling system

Pressure drop mechanisms in a cooling system enclosure

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