PL EN


Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
Tytuł artykułu

Comparative analysis of the theoretical models of ideal propulsor, ideal fluid brake, ideal screw propeller and ideal axial wind turbine

Treść / Zawartość
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The article presents a detailed discussion of the theoretical models of four different fluid dynamic devices: an ideal propulsor, an ideal fluid brake, an ideal screw propeller and an ideal turbine. The four models are presented with all relevant mathematical formulae regarding the forces, the power and the efficiency. It is demonstrated that the application of the model of an ideal optimum fluid brake according to the Betz theorem for determination of the maximum effectiveness coefficient of an axial wind turbine is not correct. In the case of a turbine the inclusion of important rotational flow losses may increase the maximum value of the turbine effectiveness coefficient above the level defined by Betz. Therefore the model of an ideal turbine should be an inversion of the model of an ideal screw propeller. This conclusion is supported by numerical calculations. It may influence the design procedures of wind turbines and may lead to increase in their efficiency.
Rocznik
Tom
Strony
3--12
Opis fizyczny
Bibliogr. 4 poz., rys.
Twórcy
  • The Szewalski Institute of Fluid Flow Machinery Polish Academy of Sciences Fiszera 14 80-952 Gdansk, POLAND
  • Faculty of Mechanical Engineering Gdansk University of Technology Narutowicza 11/12 80-233 Gdansk, POLAND
Bibliografia
  • 1. Prandtl L., Betz A.: Schraubenpropeller mit geringstem Energieverlust, enthalten in “Vier Abhandlungen zur Hydrodynamik und Aerodynamik”, Goettingen, Reprint 1927.
  • 2. Chaja P., Góralczyk A., Koronowicz T.: Experimental and Numerical Investigation of Small Axial Turbines, TASK Quarterly vol. 14 No 3, 2011.
  • 3. Koronowicz T.: The Influence of the Cavitation Tunnel Walls on the Propeller Characteristics (in Polish), Bulletin of IFFM No 356/1965.
  • 4. Koronowicz T.: The Theoretical Model of the Propeller Slipstream Based on the Concentrated Form of Vorticity with Cavitating Kernels and Hydrodynamic Characteristics of the System of Helicoidal Vortices in Bounded Fluid Domain (in Polish), Scientific Papers of the IFFM No 58/956/1979.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-e2571774-ca45-4240-bad5-e356a1769bd8
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.