contra-rotating
Convertiplane cruise performance optimization with Contra Rotating Propellers
... with contra-rotating propellers and turbine response to command (throttle authority) will be ...the contra rotating coaxial configuration, the possibility of splitting the power input into two ...
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Contra-rotating marine current turbines : performance in field trials and power train developments
... A contra-rotating turbine may to some extent alleviate this ...a contra- rotating machine produces a fundamentally different wake structure, with more favourable dissipation ...
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A contra-rotating marine current turbine on a flexible mooring : development of a scaled prototype
... The contra-rotating prime mover torque balance critical to maintaining the zero reactive torque and thus providing turbine hydrodynamic stability is provided inherently by the magnetic flux linkage across ...
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Internal Flow Condition between Front and Rear Rotor of Contra Rotating Small Sized Axial Fan at Low Flow Rate
... The commercial software ANSYS-CFX 14.5 was used to investigate the flow condition between the front and rear rotors of the contra-rotating small-sized axial fan which couldn’t be measured by the experiment. ...
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Stagnation–saddle points and flow patterns in Stokes flow between contra-rotating cylinders
... between rotating cylinders has been investigated by a number of previous authors; Jeffery (1922) analysed Stokes flow between fully submerged contra-rotating cylinders using bi-polar ...
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Integration of a direct drive contra-rotating generator with point absorber wave energy converters
... drive contra-rotating generator (DD-CRG), originally designed for the tidal energy industry, to a generic point absorber wave energy ...The contra-rotation of the generator facilitates lower torque ...
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Performance and Internal Flow of Contra Rotating Small Sized Cooling Fan
... DOI: 10.4236/ojfd.2018.82013 182 Open Journal of Fluid Dynamics consumption in above facilities and equipments [2]. Axial fans are used as cool- ing fans of servers and desk top computers. Then, researches of axial fans ...
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Modeling and Numerical Simulation of Wings Effect on Turbulent Flow between two contra rotating cylinders
... two contra- rotating discs for smooth discs and discs with wings, these authors primarily were interested in the average sizes without taking several values height of the ...
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Flow in a double-film-fed fluid bead between contra-rotating rolls, Part 2: bead break and flooding
... Two-dimensional flow is considered in a fluid bead located in the gap between a pair of contra-rotating cylinders and bounded by two curved menisci. The stability of such bead flows with two inlet films, ...
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Development and in-sea performance testing of a single point mooring supported contra-rotating tidal turbine
... generation, contra-rotating marine current turbine has been developed by the Energy Systems Research Unit at the University of ...rotor, contra-rotating turbine directly coupled to a ...
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Experimental observations of an installed on pylon contra rotating open rotor with equal blade number in pusher and tractor configuration
... a contra-rotating open rotor (CROR) on modified Boeing 727 and McDonnell Douglas MD-80 airframes, were discontinued in the 1980s primarily as a result of falling oil ...
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Contra-rotating marine current turbines : single point tethered floating system - stabilty and performance
... This complete stand-alone system comprised a gravity foundation; a compliant mooring; a contra- rotating turbine with a direct drive, open to sea, permanent magnet generator; and a floatation buoy. The ...
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Unsteady Flow Condition between Front and Rear Rotor of Contra Rotating Small Sized Axial Fan
... the contra-rotating fans and pumps were verified by experimental results [3] ...the contra-rotating rotors for the small-sized axial fans was proposed for the improvement of the ...of ...
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Design and testing of a contra-rotating tidal current turbine
... Transfer of strain gauge data from the two contra-rotating rotors posed some problems. Initially each rotor hub contained a compact data storage device in the form of a WAV format recorder; however timing ...
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Development of a contra-rotating tidal current turbine and analysis of performance
... With rotor 1 stalled (Figure 14) disturbances to rotor 2 should occur 3 times per revolution, and this effect is clearly visible for both thrust and edge loads. The interesting feature is the magnitude of cyclic thrust ...
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Design and initial testing of a contra-rotating tidal current turbine
... Transfer of strain gauge data from the two contra-rotating rotors posed some problems. Initially each rotor hub contained a compact data storage device in the form of a WAV format recorder; however timing ...
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Prediction of the acoustic shielding by aircraft empennage for contra rotating open rotors
... The contra-rotating open rotor (CROR) technology offers fuel burn reduction and is seen as a good alternative to turbofan engines for the propulsion of future low to medium range ...of rotating ...
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Study and optimization of a contra rotating propeller hub for convertiplanes: VTO and hovering
... the contra-propeller version, of the interconnecting transmissions between the two rotors at the ...the contra-rotating propeller guarantees better propulsion ...
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Study on Contra Rotating Small Sized Axial Flow Hydro Turbine
... adopted contra-rotating rotors which can be expected to achieve high performance and low-solidity rotors with wide flow passage in order to accomplish high performance and stable opera- ...of ...
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Flow in a double-film-fed fluid bead between contra-rotating rolls, Part 1: equilibrium flow structure
... The lubrication model was used to calculate several critical flow rates at which saddle points connect to each other and to the free surfaces, hence transforming the flow structure, and [r] ...
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