Investigation of endwall flows and losses in axial turbines. Part I. Formation of endwall flows and losses

• Autorzy: Lampart P.

Warianty tytułu

PL

Badanie przepływów i strat brzegowych w turbinach osiowych. Część I. Formowanie się przepływów w strefie brzegowej i strat brzegowych

• Języki publikacji: EN

Abstrakty

EN

Endwall flows are among the most important sources of loss in turbines. The process of formation of endwall flows and evolution of vorticity from the endwall boundary layers is briefly described in the paper. The resulting endwall losses are discussed. The endwall boundary layer losses are evaluated theoretically by integrating the entropy increase in the boundary layer and assuming a certain model of blade profile load. The endwall losses are also calculated with the help of CFD in a 3D straight turbine cascade of Durham and compared with the results of available experimental data of ERCOFTAC.

PL

Przepływy brzegowe stanowią jedno z głównych źródeł strat w turbinach. W pracy w skrócie wyjaśniono proces formowania się przepływów brzegowych i ewolucję wirowości pochodzącej z brzegowych warstw przyściennych. Przedyskutowano wynikające stąd straty przepływu. Wyznaczono teoretycznie straty przepływu w brzegowej warstwie przyściennej poprzez całkowanie przyrostu entropii wzdłuż warstwy brzegowej i zakładając pewien model obciążenia profilu łopatkowego. Z pomocą programów komputerowych numerycznej mechaniki płynów wyznaczono także przepływ i straty brzegowe w prostej palisadzie turbinowej Durham i porównano otrzymane rezultaty z danymi eksperymentalnymi ERCOFTAC.

Słowa kluczowe

EN

axial turbine; endwall flow; secondary flow; enthalpy loss

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2009
• Tom: Vol. 47 nr 2
• Strony: 321--342
• Opis fizyczny: Bibliogr. 34 poz., rys.

Twórcy

autor

Lampart P.

• The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Science, Gdańsk, Poland,

Bibliografia

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