Abstract
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.
Highlights
Small-sized axial fans are used as cooling fans for electric equipment i.e. laptop, desk top computers and servers
The influence of the blade row distance in the range of L = 10 - 30 mm on the fan static pressure was small, but there is a tendency that the fan static pressure of L = 30 mm became large compared to that of L = 10 mm at the low flow rate
This characteristic could be confirmed in the numerical analysis results too
Summary
Small-sized axial fans are used as cooling fans for electric equipment i.e. laptop, desk top computers and servers. The blade row distance between the front and rear rotors is a key parameter to consider the wake and potential interaction for the contra-rotating fan. The influence of the blade row distance between the front and rear rotors and pressure fluctuations on the casing wall were investigated for the counter rotating fan with fan diameter D = 375 mm [3] [7]. The performance curves of the contra-rotating small-sized axial fan with 100 mm diameter are compared with the unsteady numerical. Pressure fluctuations phase locked each front and rear rotor's rotation are shown and the influences of the wake and the potential interference at the low flow rate (10% of the design flow rate) are discussed by the unsteady numerical analysis results
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