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1
Content available A complete design of tandem co-rotating propellers using the new computer system
Koronowicz T., Krzemianowski Z., Tuszkowska T.
Polish Maritime Research
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2010
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nr 4
17-25
EN
The computer system for the complete design of the tandem co-rotating propellers, presented in this article, has several common blocks and procedures with the computer system for the design of conventional single propellers, presented in detail in Polish Maritime Research No. 1 Vol. 16 (2009). In this article only these blocks and procedures are described, which are different in both systems. The comparative analysis of the designed tandem propeller and a conventional propeller is also included.
2
Content available A complete design of contra-rotating propellers using the new computer system
Koronowicz T., Krzemianowski Z., Tuszkowska T., Szantyr J. A.
Polish Maritime Research
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2010
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nr 1
14-24
EN
The computer system for the complete design of the contra-rotating propellers presented in this article has several common blocks and procedures with the systems for design of single propellers and tandem corotating propellers, presented in detail in the Polish Maritime Research No.1 and No.4 of the Volume 16, 2009. In this article only the blocks and procedures developed specially for the contra-rotating propellers are described. The system is based on the lifting line and lifting surface models and on the Computational Fluid Mechanics methods. The comparative analysis of the contra-rotating propellers and the tandem corotating propellers is included.
3
Content available A complete design of ship propellers using the new computer system
Koronowicz T., Krzemianowski Z., Tuszkowska T., Szantyr J. A.
Polish Maritime Research
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2009
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nr 1
29-34
EN
The computer system presented in this article is composed of several program blocks for the complete design of ship propellers. The design calculations are based on a combination of the modified lifting line theory and on the vortex lifting surface theory. The system enables solution of the following design problems: - calculation of the scale effect on the ship wake velocity field, including the influence of the propeller and rudder on this field at the propeller location - maximization of the propulsive efficiency - optimization of the propeller blade geometry on the basis of the compromise between the cavitation and blade strength requirements - optimization of the number of propeller blades and blade geometry on the basis of the acceptable level of induced pressure pulses and unsteady shaft bearing forces - calculation of the blade spindle torque for the controllable pitch propellers. The computer system is equipped with many numerical options for graphical visualization of the input data, including an easy possibility of their correction and control of the intermediate and final results of calculations.
4
Content available A complete design of ducted propellers using the new computer system
Koronowicz T., Krzemianowski Z., Tuszkowska T., Szantyr J. A.
Polish Maritime Research
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2009
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nr 2
34-39
EN
The computer system for the completed design of the ducted ship propellers has some common blocks and procedures with the analogical system for open propellers that has already been presented in detail in the Polish Maritime Research [1]. This article describes only these blocks and procedures which are specific for the design of ducted propellers. These new blocks concern first of all the procedures for the design calculation of ducted propellers and for the analysis of the ducted propeller operation in the non-uniform velocity field behind the ship hull. The comparative analysis of computation results for different types of ducts is also presented.
5
Content available remote A computer method for prediction of the velocity field behind a full-scale ship hull
Koronowicz T., Tuszkowska T., Wacławczyk T.
Polish Maritime Research
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2003
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nr 1
3-9
EN
One of the most important problems in the ship propulsion prognosing is determination of the full-scale velocity field within the propeller operation area behind the ship hull. Numerical calculation results of such velocity field, obtained by means of the own computer software PANSHIP-2 (the "numerical model basin") are presented in this paper. Selected examples illustrate the influence of propeller operation on the effective field. Also, the scale effect of the nominal flow field is discussed.
6
Content available remote Propulsion prognosis for a ship according to the zero version (0-JH) of the new power prediction method
Jarzyna H., Tuszkowska T.
Polish Maritime Research
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2002
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Vol. 9, nr 3
3-7
EN
The ITTC-78 power prediction method can be divided into three groups of procedures: R TS - procedures, T BS - procedures and the Q BS - procedures. Only the Q BS - procedures were analyzed in the paper [7] where a new approach to the determination of Q BS and n S parameters was given. A new idea of the equivalent open propeller is the basic difference between the Q BS - ITTC procedures and the new Q BS - procedures called JH ones. This paper presents the numerical results of power prediction for a selected ship, obtained with the use of the zero version (0-JH) of the new method (in its 0-JH3 variant). A comparison between the ITTC-78 method, 0-JH3 method and sea trial results was also given.
7
Content available remote On the power prediction methods in the preliminary ship design stage
Jarzyna H., Tuszkowska T.
Polish Maritime Research
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2001
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Vol. 8, nr 3
3-7
EN
The ITTC-78 power prediction method can by divided into three groups of procedures: RTS- procedures, TBS- procedures and the QBS- procedures. Only the QBS- procedures are analyzed in this paper. A new approach to the determination of QBS and nS parameters is proposed. Outline of the new methods is briefly presented. The new idea of equivalent open propeller is the basic difference between the ITTCQ BS- procedures and the Q BS-JH - procedures. The aim of this approach is to reduce the number of parameters needed to be corrected due to the scale effect and to generate a situation where the Q BS, n S and V TS parameters are of unique value independent of the subjective choice of averaging criteria.
8
Content available remote Badania eksperymentalne opływu wierzchołków płatów na tle obliczeń numerycznych
Koronowicz T., Tuszkowska T.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2000
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nr 117, vol. 1
307-314
PL
W pracy zaprezentowano wyniki badań teoretycznych i eksperymentalnych związanych z opływem wierzchołków skrzydeł, począwszy od pierwszych modeli wirowych skrzydeł Żukowskiego, a kończąc na dwupowłokowym modelu powierzchni nośnej. Zaprezentowano tu najnowsze wyniki badań modelowych kawitacji wirowej na tle obliczeń numerycznych.
EN
Results of theoretical and experimental investigations of the flow around wing tips are reported. The analysis is starting with the earliest vortex model of Joukowsky wings, ending with double lifting surface model. The paper presents comparison of the latest model testing of vortex cavitation with numerical computations.
9
Content available Numerical investigation of the flow around wing tips
Koronowicz T., Tuszkowska T., Wilczyński L.
TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
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2000
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Vol. 4, No 2
203-212
EN
The paper dwells with the problems of modelling the flow around a wing tip and tip vortex cavitation. The theoretical bases of the vorticity method and vorticity calculation models for design and estimation of hydrodynamic characteristics of the hydrofoil are presented. Basic assumptions of a double layer lifting surface model are described. A double layer lifting surface model enables proper modelling of the phenomena occurring in the flow around a hydrofoil tip and especially the generation of a free vortices system.
10
Content available remote Theoretical and experimental investigation of the generation mechanism of tip vortex and vortex cavitation
Koronowicz T., Tuszkowska T., Wilczyński L.
Polish Maritime Research
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2000
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Vol. 7, nr 2
3-7
EN
The paper presents the problem of tip vortex cavitation inception in the flow around a screw propeller. The most recent experimental and theoretical results concerning mechanisms of tip vortex generation and vortex cavitation inception are reported.
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