Skutki energetyczne stosowania wysokich kątów natarcia w pompach wolnobieżnych

• Autorzy: Misiewicz A. , Plutecki J.
• Konferencja: Międzynarodowa Konferencja Naukowo-Techniczna Energetyka 2006. Wrocław, 8-10 listopad 2006 r.
• Języki publikacji: PL

Abstrakty

EN

While modeling flow channels and looking for die shape causing the minimum hydraulic loss, issues connected with geometry of the inlet zone of impeller blades are often underestimated. The thickness of the blade results mainly from the technological abilities as well as the demands of the medium pumped. The attack angle in impellers designed for normal uses is assumed to range from 2° to 6°. The impact of these two parameters onto the efficiency level is not precisely described in the literature on the subject. It appears, however, that large and very large attack angles may bring about positive energetistic effects. It was proved by the experiments on low specific-speed impellers (range from 15 to 30) in which the inlet angle of the blade was changed from 12° to 72°. The obtained results are surprising and encourage an attempt to identify the phenomenon. For the purposes of interpretation, three-dimensional analytic method with CFD programmed was used to conduct tests of the flow, which resulted in achieving well-ordered velocity distribution at relatively high attack angles. Thus, the results obtained from the laboratory experiments were verified. The tests and considerations helped to work out a formula useful for engineering purposes, to relate the attack angles not only with the specific-speed, which is often used, but also with the perpendicular inlet angle.

Słowa kluczowe

PL

pompa wirowa; projektowanie; kąt natarcia; numeryczna analiza przepływu

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Systems : journal of transdisciplinary systems science
• Rocznik: 2006
• Tom: Vol. 11,spec.1/2
• Strony: 464--471
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Misiewicz A.

autor

Plutecki J.

• Zakład Przepływowych Maszyn Energetycznych ENERGOM, ul. Ślężańska 13, 58-100 Świdnica

Bibliografia

• [1] JĘDRAL W., Pompy wirowe odśrodkowe, Warszawa, WPW, 1996, 22-23, 66-67, 98-99.
• [2] MISIEWICZ A., SKRZYPACZ J.: Analiza numeryczna pracy pomp wolnobieżnych z wirnikami o dużych kątach wlotowych. Prace naukowe Politechniki Radomskiej 2003, 445-450.
• [3] OWSIANNIKOW B., BOROWSKI B., Teoria i razcziot agregatow pitania żidkostnych raketnych dwigatelej, Maszinostrojenic, Moskwa 1971.
• [4] PLUTECKI J., MISIEWICZ A.: The Energetistic Effects Connected with Modification of the Inlet Angle of the Blade of a Slow Specific-speed Impeller. Mechanical Engineering - 6th International Scientific Conference, Bratislava 2002, 12.
• [5] PLUTECKI J., SKRZYPACZ J.: Zastosowanie specjalistycznego programu CFX BladeGen w procesie projektowania pomp, Pompy Pompownie nr 1/2003, 35-37.
• [6] TROSKOLANSKI A.T., ŁAZARKIEWICZ Sz., Impeller Pumps, Oxford, Pergamon Press Ltd., 1965, 70-71,134-135.