NUMERICAL ANALYSIS OF AEROFOIL SECTION OF BLADE OF AXIAL FLOW FAN

The nonlinear dynamics are studied for a supported cylinder subjected to axial flow. A nonlinear model is presented for dynamics of the cylinder supported at both ends. The nonlinear terms considered here are the quadratic viscous force and the structural nonlinear force induced by the lateral motions of the cylinder. Using two-mode discretized equation, numerical simulations are carried out for the dynamical behavior of the cylinder to explain the flutter instability found in the experiment. The results of numerical analysis show that at certain value of flow velocity the system loses stability by divergence, and the new equilibrium (the buckled configuration) becomes unstable at higher flow leading to post-divergence flutter. The effect of the friction drag coefficients on the behavior of the system is investigated.

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Prediction and measurement of axial flow fan aerodynamic and aeroacoustic performance in a split-type air-conditioner outdoor unit

International Journal of Refrigeration ◽

10.1016/j.ijrefrig.2012.11.024 ◽

2013 ◽

Vol 36 (3) ◽

pp. 1098-1108 ◽

Cited By ~ 8

Author(s):

Xifeng Zhao ◽

Jinju Sun ◽

Zhi Zhang

Keyword(s):

Axial Flow ◽

Air Conditioner ◽

Axial Flow Fan

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Improvement of Stalling Characteristics of an Axial-Flow Fan by Radial-Vaned Air-Separators

Journal of Turbomachinery ◽

10.1115/1.3104612 ◽

2010 ◽

Vol 132 (2) ◽

Cited By ~ 4

Author(s):

Nobuyuki Yamaguchi ◽

Masayuki Ogata ◽

Yohei Kato

Keyword(s):

Solid Wall ◽

Axial Flow ◽

Internal Flow ◽

Rotor Blades ◽

Relative Location ◽

Flow Conditions ◽

Axial Flow Fan ◽

Light Load ◽

Stall Prevention ◽

Air Separator

An improved construction of air-separator device, which has radial-vanes embedded within its inlet circumferential opening with their leading-edges facing the moving tips of the fan rotor-blades so as to scoop the tip flow, was investigated with respect to the stall-prevention effect on a low-speed, single-stage, lightly loaded, axial-flow fan. Stall-prevention effects by the separator layout, relative location of the separator to the rotor-blades, and widths of the openings of the air-separator inlet and exit were parametrically surveyed. As far as the particular fan is concerned, the device together with the best relative location has proved to be able to eliminate effectively the stall zone having existed in the original solid-wall characteristics, which has confirmed the promising potential of the device. Guidelines were obtained from the data for optimizing relative locations of the device to the rotor-blades, maximizing the stall-prevention effect of the device, and minimizing the axial size of the device for a required stall-prevention effect, at least for the particular fan and possibly for fans of similar light-load fans. The data suggest the changing internal flow conditions affected by the device conditions.

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