Experimental Research for Performance and Noise of Small Axial Flow Fan (Influence of Parameter of Blade)

Ito, Takahiro; Minorikawa, Gaku; Nagamatsu, Akio; Suzuki, Shoji

doi:10.1299/kikaib.72.670

Cited by 10 publications

(5 citation statements)

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“…The geometry of the rotor and primary dimensions of the contra-rotating small-sized axial fan (RRtype) are shown in Figure 1 and advantage of the airfoil blade for the small-sized axial fan [13], however, a circular-arc blade was generally used for small-sized axial fans. Figure 2 show the schematic diagram and picture of the experimental apparatus for RRtype.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Internal Flow Condition between Front and Rear Rotor of Contra-Rotating Small-Sized Axial Fan at Low Flow Rate

Shigemitsu¹,

Tanaka²,

Hirosawa³

et al. 2017

OJFD

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Contra-rotating small-sized fans are used as cooling fans for electric equipment. The internal flow condition between the front and rear rotors of the contra-rotating small-sized fan is not known well especially at the low flow rate. Furthermore, the blade row distance between the front and rear rotors is an important parameter for the contra-rotating small-sized fan and its influence on the internal flow condition is not clarified at the low flow rate. Therefore, the internal flow condition of the contra-rotating small-sized fan at the low flow rate is investigated by the numerical analysis in this research. The numerical analysis results are validated by comparing the fan static pressure curves of the numerical results to the experimental results. The internal flow condition at the low flow rate is clarified using the numerical models of the different blade row distance L = 10 mm and 30 mm. In the present paper, pressure fluctuations phase locked each front and rear rotor's rotation are shown and the influences of the wake and the potential interference are discussed by the unsteady numerical analysis results at the low flow rate.

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Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Internal Flow Condition between Front and Rear Rotor of Contra-Rotating Small-Sized Axial Fan at Low Flow Rate

Shigemitsu¹,

Tanaka²,

Hirosawa³

et al. 2017

OJFD

View full text Add to dashboard Cite

show abstract

“…In this research, an aerofoil blade was used because there was a report which implied an advantage of the aerofoil blade for the small-sized axial fan [8], however a circular-arc blade was generally used for small-sized axial fans. RRtype rotor used for the experiment was changed a little from the rotor for the numerical analysis in the blade thickness, because the thickness for the numerical analysis rotor was thin and the lack of the strength for using it for the experiment was worried.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Influence of Blade Row Distance on Performance and Flow Condition of Contra-Rotating Small-Sized Axial Fan

Shigemitsu¹,

Fukutomi²,

Shimizu³

2012

International Journal of Fluid Machinery and Systems

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Small-sized axial fans are used as air coolers for electric equipment. There is a strong demand for higher power of fans according to the increase of quantity of heat from electric devices. Therefore, higher rotational speed design is conducted, although, it causes the deterioration of the efficiency and the increase of noise. Then, the adoption of contrarotating rotors for small-sized fans is proposed for the improvement of the performance. In the case of contra-rotating rotors, blade row distance between the front and the rear rotors influences on the performance and the noise. Therefore, it is important to clarify the optimum blade row distance between front and rear rotors. The performance curves of the contra-rotating small-sized axial fan under the condition of different blade row distances are shown and the blade row interaction between the front and the rear rotors are discussed by the numerical results. Furthermore, the optimum blade row distance of the contra-rotating small-sized axial fan is considered.

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“…The rotational speed of front and rear rotors of RRtype was N f =N r =1780 min 1 . In this research, an aerofoil blade was used because there was a report that implied an advantage of the aerofoil blade for the small-sized axial fan [10], however a circular-arc blade was generally used for small-sized axial fans. RRtype rotor used in the experiment was changed a little from the rotor for the numerical analysis in the blade thickness, because the thickness of the rotor for the numerical analysis was thin and lack of strength for using it for the experiment was worried.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Unsteady flow condition of contra-rotating small-sized axial fan

et al. 2011

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Small-sized axial fans are used as air cooler for electric equipments. But there is a strong demand for higher power of fans according to the increase of quantity of heat from electric devices. Therefore, higher rotational speed design is conducted, although, it causes the deterioration of efficiency and the increase of noise. Then, the adoption of contra-rotating rotors for the small-sized axial fan is proposed for the improvement of performance.In the case of contra-rotating rotors, it is necessary to design the rotor considering the unsteady flow condition of each front and rear rotor. In the present paper, the fan performance of the contra-rotating small-sized axial fan with 100mm diameter at a designed and a partial flow rates is shown, and the unsteady flow conditions at the inlet and the outlet of each front and rear rotor are clarified with unsteady numerical results. Furthermore, the relation between the performance and the unsteady flow condition of the contra-rotating small-sized axial fan is discussed and the methods to improve the performance are considered.

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Experimental Research for Performance and Noise of Small Axial Flow Fan (Influence of Parameter of Blade)

Cited by 10 publications

References 0 publications

Internal Flow Condition between Front and Rear Rotor of Contra-Rotating Small-Sized Axial Fan at Low Flow Rate

Internal Flow Condition between Front and Rear Rotor of Contra-Rotating Small-Sized Axial Fan at Low Flow Rate

Influence of Blade Row Distance on Performance and Flow Condition of Contra-Rotating Small-Sized Axial Fan

Unsteady flow condition of contra-rotating small-sized axial fan

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