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1
Content available Numerical Analysis of the Unsteady Propeller Performance in the Ship Wake Modified By Different Wake Improvement Devices
Bugalski T., Szantyr J.
Polish Maritime Research
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2014
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nr 3
32--39
EN
The paper presents the summary of results of the numerical analysis of the unsteady propeller performance in the non-uniform ship wake modified by the different wake improvement devices. This analysis is performed using the lifting surface program DUNCAN for unsteady propeller analysis. The object of the analysis is a 7000 ton chemical tanker, for which four different types of the wake improvement devices have been designed: two vortex generators, a pre-swirl stator, and a boundary layer alignment device. These produced five different cases of the ship wake structure: the original hull and hull equipped alternatively with four wake improvement devices. Two different propellers were analyzed in these five wake fields, one being the original reference propeller P0 and the other - a specially designed, optimized propeller P3. The analyzed parameters were the pictures of unsteady cavitation on propeller blades, harmonics of pressure pulses generated by the cavitating propellers in the selected points and the fluctuating bearing forces on the propeller shaft. Some of the calculated cavitation phenomena were confronted with the experimental. The objective of the calculations was to demonstrate the differences in the calculated unsteady propeller performance resulting from the application of different wake improvement devices. The analysis and discussion of the results, together with the appropriate conclusions, are included in the paper.
2
Content available The predictions of resistance and propulsion for 4 types of ships
Brzoska E., Grygorowicz M., Rogalski A., Stasiak J., Szantyr J.
Polish Maritime Research
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2004
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S 1
34-38
EN
In this paper the predictions of resistance and propulsion for 4 types of ships: container carrier, oil product tanker, ro-ro vessel and river-sea vessel included in the EUREKA "Baltecologicalship" project E!2772 are presented. All the above ships were designed by the SINUS Enterprise Ltd. The scope of the research covers: experimental measurement of ship resistance in calm water, determination of resistance increment in irregular waves and computational powering prediction for POD propulsors. The experiments were conducted in the Laboratory of the Department of Underwater Technology, Hydromechanics and Design of Ships, Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology.
3
Content available Application of CFD for analysis of the ship and propeller flow
Bugalski T. J., Szantyr J.
TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
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1998
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Vol. 2, No 2
349-356
EN
The paper describes the computer system PANSHIP for analysis of flow around the ship hull moving with constant velocity in calm water, including the effects of free surface and propeller operation. This system calculates the potential flow using the discrete distribution of Rankine sources on the hull. Viscous flow is computed using the integral method in the bow section and Reynolds averaged Navier Stokes equation (RANS) in the stern section of the ship hull. Results of this analysis may be directly used in ship hull design and they may also serve as input for calculation of the unsteady flow phenomena accompanying propeller operation in the non-uniform velocity field generated by the hull. PANSHIP has been verified experimentally and it forms a useful tool available for ship designers and for marine hydrodynamicists.
4
Content available remote Design and analysis of surface piercing propellers
Szantyr J.
Polish Maritime Research
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1998
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nr 1
2-6
EN
The surface piercing propellers are promising propulsors for high speed craft, already proven by many full scale applications on small racing and sports boats. This paper presents newly developed theoretical procedures for design and hydrodynamics/strength analysis of such propellers. The design procedure is based on the lifting line theory while the analysis is performed by means of the lifting surface/finite element method. These procedures are confroted with the results of a series of model experiments by which surface piercing propellers were thoroughly tested in single and twin screw configurations. This confrontation demonstrates correctness of the basic theory and practical value of the design and analysis procedures.
5
Content available A computer program for determination of acoustic pressure field related to ship hull and propeller operation
Koronowicz T., Szantyr J.
Hydroacoustics
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1997
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Vol. 1
163--168
EN
The paper presents the results of analysis of the influence of water viscosity and propeller operation effects on the hydroacoustic pressure field generated by the moving ship hull. The analysis is based on the results of calculations using the program based on Computational Fluid Dynamics for the hull flow and lifting surface method for the propeller flow.
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