Flow field behind the wake generator

• Autorzy: Kaiser M. , Wierciński Z.
• Języki publikacji: EN

Abstrakty

EN

The investigation of the non-stationary flow behind the wake generator is presented. The mean velocity and rms velocity fluctuations are measured. The coordinates of points where the wakes from the windward side of the generator are intercepted by the wakes (rods) from the leeward of the generator are determined. The co-ordinates of these points depend on the diameter of the generator, the velocity of the oncoming flow and the frequency of rotation, i. e. the Strouhal number of the generator. The results of calculation are compared with the measurements and a good compatibility has been obtained. At the points of the wake cutting an increased fluctuations level is measured. The results of these investigations can be used in the study of the boundary layer transition induced by wakes with the influence of the wake cutting effect. This phenomenon is known in the turbomachinery as the so called clocking effect where they generate regions of enhanced turbulence level.

Słowa kluczowe

EN

wake generator; ineterception of wakes

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2003
• Tom: nr 112
• Strony: 3--20
• Opis fizyczny: Bibliogr. 10 poz., rys., tab.

Twórcy

autor

Kaiser M.

• Institute of Fluid-Flow Machinery Polish Academy of Sciences, Fiszera 14, 80-952 Gdańsk, Poland

autor

Wierciński Z.

• Institute of Fluid-Flow Machinery Polish Academy of Sciences, Fiszera 14, 80-952 Gdańsk, Poland

Bibliografia

• 1. Arndt N.: Blade Row Interaction in a Multistage Low-Pressure Turbine, ASME Paper, 91-GT-2B3, 1991.
• 2. Elsner J.W., Drobniak S.: Metrology of Flow Turbulence, Zakład Narodowy im. Ossolińskich, Wyd. PAN, 1995, (in Polish).
• 3. Juszyna L., Wierciński Z.: Inuestigations of boundary laser on a flat plate in the region of laminar-to-turbulent transition induced by periodical wakes from a rotating turbuliser, Report of IFFM No, 367/9a, Gdańsk 1994, (in Polish).
• 4. Kaiser M.: Inuestigations of & rnean flow behind a rotating turbuliser at rotating frequency of f=4 Hz, Report of IFFM No. 1117/2001, Gdańsk 2001, (in Polish).
• 5. Kaiser M.: Inuestigations of a mean flow behind a rotating turbuliser at rotating frequency of f= 6 Hz, Report of IFFM No. 1117/2001, Gdańsk 2001, (in Polish).
• 6. Pfeil H., Herbst R., Schroder T.: Inuestigation of the laminar-turbulent transition of boundary layer disturbed by wakes, J. Engng for Power, Vol. 105(1983), 130-137.
• 7. Prosnak W.: Fluid mechanics, PWN, Warszawa 1970.
• 8. Schroder T.: Entwicklung des instationren Nachlaufs hinter quer zur Stromungsrichtung bewtegen Zylindern und dessen Einfluss auf das Umschlagverhalten von ebenen Grenzschichten stromabwarst angeordneten Versuchskiper, Dissertation, TH Darmstadt, 1985, (in German).
• 9. Wierciński Z.: Inuestigations of the limits in an aerodynamic tunnel with a closed circuit, Report of IFFM No. 228/91, Gdańsk 1991, (in Polish).
• 10. Wierciński Z.: Laminar-to-turbulent transition in the boundary layer induced,by wakes, Bulletin of IFFM, 499/1450/99, Gdańsk 1999, (in Polish).