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    Wyświetlanie 1-6 z 6
    Tytuł:
    Numerical analysis of influence of selected elements on effectiveness of streamline rudder
    Autorzy:
    Abramowski, T.
    Szelangiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258696.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    streamline rudder
    improvement of rudder effectiveness
    computational fluid dynamics (CFD)
    Opis:
    During designing steering gear for large fast transport ships (e.g. container carriers), shipowners usually put forward strong demands concerning ship manoeuvrability. It means that streamline rudders should be characterized by a high effectiveness, i.e. fast increasing values of lifting force in function of rudder angle and large values of lifting force related to rudder area. As gabarites of streamline rudder depend on a form and draught of stern part of ship’s hull, an improvement of rudder effectiveness can be reached by an appropriate selection of rudder profile and application of additional elements to rudder blade. This paper presents results of numerical investigations (by using CFD methods) of hydrodynamic forces acting on rudder blades of the same gabarites but based on different profiles. Such calculations were also performed for selected rudder blades fitted with additional elements intended for the improving of rudder effectiveness.
    Źródło:
    Polish Maritime Research; 2010, 3; 3-7
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part I. Influence of hull form modification on ship resistance characteristics
    Autorzy:
    Szelangiewicz, T.
    Abramowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258900.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship hull geometry
    computational fluid dynamics (CFD)
    resistance
    wake
    propeller efficiency
    Opis:
    After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of 3 parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.
    Źródło:
    Polish Maritime Research; 2009, 4; 3-8
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of influence of streamline rudder on screw propeller efficiency
    Autorzy:
    Abramowski, T.
    Handke, J.
    Szelangiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259235.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Streamline rudder, improvement of screw propeller efficiency
    computational fluid dynamics (CFD)
    Opis:
    During designing the ship its designer tends to obtain as high as possible efficiency of ship propulsion system. To this end on certain ships additional elements such as: nozzles, half-nozzles or suitably profiled fins attached to underwater part of ship’s hull before screw propeller, are applied (sometimes they are intended for the mitigating of vibration resulting from operation of screw propeller). Another device which affects operation of screw propeller is streamline rudder capable of improving its efficiency (most of the transport ships is fitted with single screw propeller and streamline rudder placed behind it). In this paper the influence of streamline rudder on screw propeller efficiency has been examined with the use of numerical methods of fluid dynamics (CFD).The obtained results indicate a very favourable influence of the rudder on screw propeller efficiency. Research in this area is continued and its results concerning impact of particular geometrical parameters of rudder on screw propeller efficiency, will be presented in the future.
    Źródło:
    Polish Maritime Research; 2010, 2; 18-22
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part II. Influence of hull form modification on wake current behind the ship
    Autorzy:
    Abramowski, T.
    Szelangiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259395.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship hull geometry
    numerical (computational) fluid dynamics
    resistance
    wake
    propeller efficiency
    Opis:
    After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of three parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.
    Źródło:
    Polish Maritime Research; 2010, 1; 3-9
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of effect of asymmetric stern of ship on its screw propeller efficiency
    Autorzy:
    Abramowski, T.
    Żelazny, K.
    Szelangiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259413.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    asymmetric ship’s stern
    computational fluid dynamics (CFD)
    screw propeller efficiency
    Opis:
    During designing the ship its designer tends to achieve as-high-as possible efficiency of ship’s propulsion system. The greatest impact on the efficiency is introduced by ship’s screw propeller whose efficiency depends not only on its geometry but also distribution of wake current velocity. To change wake current distribution and improve propeller efficiency an asymmetric form is usually applied to stern part of ship hull. This paper presents results of numerical analysis of wake current velocity distribution, performed by using a CFD method for a B 573 ship of symmetric stern and the same ship of an asymmetric stern. Next, the mean values of screw propeller efficiency in non-homogenous water velocity field were calculated for both the hull versions of B 573 ship.
    Źródło:
    Polish Maritime Research; 2010, 4; 13-16
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part III. Influence of hull form modification on screw propeller efficiency
    Autorzy:
    Abramowski, T.
    Żelazny, K.
    Szelangiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/259371.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship hull geometry
    numerical (computational) fluid dynamics (CFD)
    resistance
    wake current
    propeller efficiency
    Opis:
    After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of three parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.
    Źródło:
    Polish Maritime Research; 2010, 1; 10-13
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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