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FLOW SEPARATION ANALYSIS ON THE ACCELERATING MARINE DUCTS VIA VORTEX REPRESENTATIVE METHOD

Publish Year: 1389
Type: Conference paper
Language: English
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NSMI12_041

Index date: 8 September 2010

FLOW SEPARATION ANALYSIS ON THE ACCELERATING MARINE DUCTS VIA VORTEX REPRESENTATIVE METHOD abstract

Design of the nozzle profile and the nozzle length depends seriously on requirements with respect to efficiency, danger of flow separation on the nozzle, and critical cavitation indexes on nozzle and propeller. In heavy load conditions flow separation occurrence is inevitable .It is clear that the drag of the nozzle will increase sharply in case of flow separation occurrence on the interior or exterior surface of the nozzle, furthermore, the propeller will be operating in a highly irregular flow if separation occurs on the interior surface of the nozzle )something which usually occurs in accelerating nozzle types.(In any case, the efficiency of the system would begin to decrease .Therefore, cares must be taken to prevent flow separation on the nozzle surface .In order to examination, the maximum loading of the nozzle without separation, the flow around the nozzle profile can be assumed to be two-dimensional .From the two-dimensional airfoil flow, the approximation that flow separation occurs if the lift coefficient,

FLOW SEPARATION ANALYSIS ON THE ACCELERATING MARINE DUCTS VIA VORTEX REPRESENTATIVE METHOD Keywords:

FLOW SEPARATION ANALYSIS ON THE ACCELERATING MARINE DUCTS VIA VORTEX REPRESENTATIVE METHOD authors

H Ghasemi۱

Associated Professor of Amirkabir University of Technology,Tehran

A Imantalab

۲M.Sc .student of Hydromechanics at Amirkabir University of Technology,Tehran

E Rajabiani

M.Sc .in Naval Architecture, S.V.G .Research Center, Tehran

M Rostami

M.Sc .in NavalArchitecture, S.V.G .Research Center, Tehran

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