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Empirical Formulas Prediction and CFD Calculations of Torpedo’s Propulsion Characteristics |
| YANG Qiongfang，WANG Yongsheng，LIU Kai |
| (College of Ship and Power Engineering, Naval University of Engineering, Wuhan 430033, China) |
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Abstract Empirical Formulas Prediction and CFD Calculations of Torpedo’s Propulsion Both empirical formulas and CFD calculation were used to predict torpedo’s propulsion characteristics and the hydrodynamics of the bare hull and the ducted propulsor. The result shows that within the speed from 10.29 to 25.72 m/s the difference between numerical calculated drag coefficient of the ball hull and the sum value, which is friction resistance coefficient of a flatplate and the rest drag coefficient, is less than 5.2%, which shapes the precision and reliability of the drag formula suitable for the profile of the hull. The CFD calculated open water characteristics of the ducted propulsor show good agreement with the experimental data in the range of J=1.6-2.0, with the difference less than 5%. And both the calculated thrust and torque of the propulsor and the system propulsion efficiency differ by less than 5% from the values obtained by the empirical formulas that fit to predict the torpedo propulsion performances propelled by the counterpropeller, which presents the usability of the empirical formulas to the ducted propulsor.
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Received: 19 January 2009
Published: 29 January 2010
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