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Unsteady flow condition of contra-rotating small-sized axial fan
Journal of Thermal Science, 2011Small-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.
T. Shigemitsu +4 more
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Performance and flow condition of small-sized axial fan and adoption of contra-rotating rotors
Journal of Thermal Science, 2010Small-sized axial fans are used as air coolers 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 the efficiency and the increase of noise.
Toru Shigemitsu, J. Fukutomi, Y. Okabe
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A fully reversible axial fan with two contra-rotating impellers [PDF]
, 2022 The objective of this paper is the design, manufacture and test of a fully reversible axial fan. The fundamental layout of the fan chosen consists of two identical contra-rotating impellers without guide vanes, placed in mirror image to each other in a duct-type housing.
Bamberger, Konrad +2 more
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Internal Flow Conditions of Contra-Rotating Small-Sized Axial Fan
ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 2011Small-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.
Toru Shigemitsu +3 more
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Flow Studies in Ducted Twin-Rotor Contra-Rotating Axial Flow Fans
Volume 1: Turbomachinery, 1992The design and testing of a 400 mm diameter contra-rotating fan unit was undertaken to study the flow behavior through the contra-rotating fans, and to find ways and means of improving their design and performance. The performance characteristics of the two-fan unit have shown that large overall stall margins can be achieved.
Bhaskar Roy +5 more
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Effect of Tandem Blading in Contra-Rotating Axial Flow Fans
Volume 2A: Turbomachinery, 2018With the ever-increasing demand for improved fuel efficiency and lower emissions, there is a significant emphasis on finding innovative design solutions that can replace or significantly improve the present-day turbomachinery designs. The concepts of contra-rotation and tandem blade configuration are two different methods of achieving better ...
Manas Madasseri Payyappalli +1 more
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Performance and Flow Conditions of Contra-Rotating Small-Sized Axial Fan
ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 2010Small-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.
Toru Shigemitsu +3 more
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Pre-Stall Waves: Precursors to Stall Inception in a Contra-Rotating Axial Fan
Volume 2E: Turbomachinery, 2020Abstract Stall in a compressor or a fan is often associated with pre-stall waves, that could act as precursors. The present study aims to understand in detail the pre-stall waves leading to instabilities in a low aspect ratio, low hub-tip ratio contra-rotating axial fan.
Manas Madasseri Payyappalli +1 more
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