Computational Aero-Acoustics Simulation of Automotive Radiator Fan Noise

Karim, Ahsanul; Mehravaran, Meisam; Lizotte, Brian; Miazgowicz, Keith; Zhang, Yi

doi:10.4271/2015-01-1657

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…Moreover, on the pressure surface side of the blade, a negative pressure region is created due to the separation of the flow, similar to the stagnation point pressure distribution, figure 4 However, these increases or decreases in pressure are not shown at the tip of the blade (r/Rt : 1.00). At the tip of the blade, it has been reported that a wing tip leakage vortex is formed and develops [4][5][6][7] and our results also shows that. In particular, figure 5 (a) captures that the wing tip leakage vortex formed by adjacent blade is divided near the tip of the blade leading edge (r/Rt : 0.94 and 1.00).…”

Section: Streamline and Static Pressure Distribution Near Bladesupporting

confidence: 79%

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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Section: Streamline and Static Pressure Distribution Near Bladesupporting

confidence: 79%

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

Kawano¹,

Fuchiwaki

2022

J. Phys.: Conf. Ser.

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“…For example, since it has been shown that noise can be reduced by suppressing axial fan blade surface pressure fluctuations which are strongly affected by interactions between the tip leakage vortex and the blade surface, efforts are underway to reduce such pressure fluctuations. (Jang et al, 2001;Karim et al, 2015;Jeong et al, 2007;Iwase et al, 2017) Another method that can be used to reduce noise involves lowering the fan rotation speed while simultaneously ensuring the flow rate required for the cooling system is maintained. 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.…”

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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“…The analytical results show that tip and separation vortices affect the performance under the low flow rate condition, while the tip vortex is the dominant structure in the performance under the middle and high flow rate conditions. Karim et al 3 carried out a computational simulation to study the aero-acoustic performance of an automotive radiator fan. The complex vortices structures were observed in tip area, and the vorticity magnitude is high in the blade tip clearance area.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of different components collocations on flow of automotive cooling fan

Wen

Hao

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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The flow structure in the downstream region of the cooling fan has great impact on engine heat dissipation. An integrated PIV measurement system was designed and constructed to understand the flow field behind the cooling fan. In order to analyze the influence of interaction of different components on flow structure in downstream region, a series of experiments were conducted in four arrangements at three flow coefficients. The flow field was evaluated by velocity profile, vorticity, and turbulent intensity. These flow data reflect the effect of isolated components and their combinations quantitatively. This work provides useful information for engine cooling system design.

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Computational Aero-Acoustics Simulation of Automotive Radiator Fan Noise

Cited by 8 publications

References 7 publications

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

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

Pressure drop mechanisms in a cooling system enclosure

Experimental study on the effect of different components collocations on flow of automotive cooling fan

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