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Interaction between two closely spaced azimuthing thrusters


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Brandner, PA and Renilson, MR 1998 , 'Interaction between two closely spaced azimuthing thrusters' , The Journal of Ship Research, vol. 42, no. 1 , pp. 15-32 .

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To assist in predicting the performance of omni-directional propelled vehicles a series of experiments
has been conducted to measure the interaction between two closely spaced ducted
azimuthing thrusters. The thrusters were tested below a shallow draft ground board in a towing
tank at a spacing of approximately 2 propeller diameters. Measurements were made of forces
acting on a single thruster for a range of operating conditions and similarly on two thrusters for
a range of relative positions. The results show that forces from the trailing thruster are heavily
affected by interaction, particularly due to impingement of the race from the leading thruster,
whereas forces from the leading thruster remain essentially unaffected despite its proximity to the
trailing thruster. A semi-empirical mathematical model suitable for simulation of omni-directional
vehicle dynamics is presented. The model is based on the trajectory of the race from the leading
thruster derived from momentum considerations with additional empirical relations to account for
other more minor flow effects. Comparison of the predicted and measured results show satisfactory

Item Type: Article
Authors/Creators:Brandner, PA and Renilson, MR
Keywords: Ship ; Propeller ; Experimental study ; Maneuverability ; Performance evaluation ; Forecast model ; Interaction ; Measurement result ; Draft(marine) ; Tug boat ; Mathematical model ; Trajectory ; Force measurement ; Comparative study ;
Journal or Publication Title: The Journal of Ship Research
ISSN: 0022-4502
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