Results 221 to 230 of about 7,116 (267)
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Performance and internal flow of sirocco fan using contra-rotating rotors
Journal of Thermal Science, 2008A sirocco fan using contra-rotating rotors in which an inner rotor is settled inside the sirocco fan rotor and each rotor rotates in an opposite direction was proposed for the purpose of getting the higher pressure and making the structure of a sirocco fan more compact. If the high discharge pressure is obtained with the adoption of the contra-rotating
J. Fukutomi, T. Shigemitsu, T. Yasunobu
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Windmilling Characteristics of a Contra-Rotating Fan
Journal of Engineering for Gas Turbines and Power, 2020Abstract In the present experimental study, a low aspect ratio, low hub-tip ratio contra-rotating axial fan is investigated to understand its performance under windmilling conditions. Two configurations are tested; in the first configuration (event A), the front rotor of the contra-rotating fan is powered and the rear rotor is allowed to
Manas Madasseri Payyappalli +2 more
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Design and Investigation of a Contra-Rotating Centrifugal Fan [PDF]
, 2022 Centrifugal fans are common in many fields of application. A centrifugal fan consists of a drive, an impeller, and a volute. The volute casing is designed to turn the dynamic pressure at the outlet of the fan impeller into static pressure and to guide the flow towards a connected geometry, e.g. a flange.
Friebe, Christian +2 more
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A theory for rotating stall in contra-rotating fans
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2020This paper reports on a theory of rotating stall in contra-rotating fans and compressors. The theory is developed from Moore’s theory. A second-order hysteresis is used in the current study for the pressure rise of the counter-rotating rows. This enables the model to predict the transient behavior of the stall cell.
Hossein Khaleghi +2 more
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Design and optimization of contra-rotating fans
2018 34th Thermal Measurement, Modeling & Management Symposium (SEMI-THERM), 2018Axial contra-rotating fans can be one solution for compact, efficient, powerful air movement technology especially if the speed of each impeller can be controlled independently. No additional bladed stator is required. And this special fan concept has potential for better acoustic behavior.
Ralph Peter Mueller +2 more
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Aerodynamics of Contra-Rotating Fans With Swept Blades
ASME 2015 Gas Turbine India Conference, 2015A Counter-Rotating System (CRS) is composed of a front rotor and a rear rotor which rotates in the opposite direction. Compared with traditional rotor-stator system, the rear rotor is used not only to recover the static head but also to supply energy to the fluid.
K. Vijayraj, M. Govardhan
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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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GPGPU Based Aeroacoustic Optimization of a Contra-Rotating Fan
Volume 1A: Aircraft Engine; Fans and Blowers, 2014Contra-rotating fans have several advantages over single stage axial fans. If they are well designed, the exit flow field is almost irrotational. This helps to increase the aerodynamic efficiency by up to 16%, when compared to single stage fans. However, since the second stage interacts with the flow disturbances from the first stage, the associated ...
Michael Stadler +2 more
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Endwall Flow Development Across a Contra-Rotating Fan Unit
Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, 2000An experimental study has been made to understand the development of endwall flow across a low speed twin-rotor contra-rotating fan unit. Fluid mechanic studies of flow field in the tip region of an axial fan and of a contra-rotating unit were carried out.
S. Kumar, Bhaskar Roy
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The Design of Contra-Rotating Fans
The Journal of the Royal Aeronautical Society, 1963Rather more than twenty years ago the writer published a report on the design of wind tunnel fans: a single fan was implied. The report assumed that the pressure increment appropriate to a given axial wind velocity was known, having been either measured (e.g. on a model), or estimated from data such as the power factor of the wind tunnel. A preliminary
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