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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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Multi-disciplinary optimization of a contra-rotating fan
International Journal of Aeroacoustics, 2018This paper presents the shape optimization of the blades of a contra-rotating fan according to aerodynamic, structural and aeroacoustic criteria. The prediction of wake-interaction and trailing-edge noise emission is integrated into the optimization process by means of RANS-based hybrid methods.
Gabriele Grasso +3 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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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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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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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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