Performance and Flow Conditions of Contra-Rotating Small-Sized Axial Fan

Shigemitsu, Toru; Fukutomi, Junichiro; Okabe, Yuki; Iuchi, Kazuhiro

doi:10.1115/fedsm-icnmm2010-30418

Cited by 2 publications

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“…Therefore, there is a strong demand to establish the design method for smallsized axial fans. The performance and the circumferential averaged flow conditions at the designed flow rate and the partial flow rate were clarified by the previous research [8,9]. In the present paper, the performance curves of the contra-rotating small-sized axial fan with 100mm diameter are compared with the unsteady numerical analysis results to verify the validity of the unsteady numerical analysis results.…”

Section: Introductionmentioning

confidence: 90%

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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Section: Introductionmentioning

confidence: 90%

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

et al. 2011

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Passive Noise Reduction for a Contrarotating Fan

Wang

Huang

2014

Journal of Turbomachinery

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There has been renewed interest in the contrarotating (CR) fan configuration in aviation and other applications where size and weight are important design factors. Contra-rotation recovers swirl energy compared with the single-rotor design, but this advantage is not fully harnessed due to, perhaps, the issue of noise. This study explores passive noise reduction for a small, axial-flow, CR fan with perforated trailing-edge for the upstream rotor and perforated leading-edge for the downstream rotor. The fan is designed with simple velocity triangle analyses, which are checked by 3D flow computations. The aerodynamic consequence and the acoustic benefit of such perforated blading are investigated experimentally. The results show that there is a reduction of total pressure compared with the baseline CR fan at the same rotating speeds, but this is easily compensated for by slightly raising the rotating speeds. A reduction of 6–7 dB in overall noise is achieved for the same aerodynamic output, although there is a moderate noise increase in the high frequency range of 12.5–15.0 kHz due to blade perforations. The effect of inter-rotor separation distance is also investigated for the baseline design. A clear critical distance exists below which the increased spacing shows clear acoustic benefits.

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Performance and Flow Conditions of Contra-Rotating Small-Sized Axial Fan

Cited by 2 publications

References 0 publications

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

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

Passive Noise Reduction for a Contrarotating Fan

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