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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Parameterized modeling of contra-rotating axial flow fan based on SolidWorks
International Conference on Software Intelligence Technologies and Applications & International Conference on Frontiers of Internet of Things 2014, 2014A parametric modelling method of contra-rotating axial flow fan based on SolidWorks is presented in order to increase its modelling efficiency. The coordinates' transformation is developed, by which two-dimensional cross-section parameters of fan blade are transformed to three-dimensional spaces.
null Xiaobo Sun +3 more
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Influence of Blade Row Distance on Performance and Flow Condition of Contra-Rotating Small-Sized Axial Fan [PDF]
International Journal of Fluid Machinery and Systems, 2012 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.
Toru Shigemitsu, Junichiro Fukutomi
exaly +2 more sources
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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Design and Internal Flow Analysis of a Ducted Contra-Rotating Axial Flow Fan
Volume 1: Advances in Aerospace Technology, 2014This paper presents the design procedure of a ducted contra-rotating axial flow fan and investigates the flow behavior inside it using ANSYS CFX-15 flow solver. This study investigates parameters such as pressure ratio, inlet mass flow rate and efficiency in different operating points. This system consists of two rotors with an outer diameter of 434 mm
Ali Mohammadi, Masoud Boroomand
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Shaft Power Matching and Performance Prediction for Contra-Rotating Axial Flow Fans
HVAC&R Research, 2007The purpose of shaft power matching of contra-rotating axial flow fans (CRAFF) is to ensure the best utilization of the motors at their rated power while not to overload them at the operation.Usually it requires a lot of time and effort due to lack of theoretical guidance and, thus, becomes a major problem for the application of CRAFF.
Weixiong Wang +4 more
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Flow Dynamics of a Contra-Rotating Axial Fan Under Windmilling and Locked Conditions
AIAA Journal, 2022Jerry T. John +2 more
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DESIGN AND ANALYSIS OF A DUCTED CONTRA-ROTATING AXIAL FLOW FAN
Proceeding of Proceedings of CONV-14: International Symposium on Convective Heat and Mass Transfer. June 8 - 13, 2014, Kusadasi, Turkey, 2014Ali Mohammadi +2 more
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1703 Study on the Contra-Rotating Small-Sized Axial Fan
The proceedings of the JSME annual meeting, 2008Tadahiro YANO +3 more
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Comparative Analysis of Radial and Axial Flux Permanent Magnet Machine for a Contra Rotating Fan
2023 26th International Conference on Electrical Machines and Systems (ICEMS), 2023Xuanyang Hu +4 more
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