The effects of lean and sweep on transonic fan performance a computational study

• Autorzy: Denton J. D.
• Konferencja: Seminar/summer school on "CFD for turbomachinery applications" (01-03.09.2001, Gdańsk, Poland)
• Języki publikacji: EN

Abstrakty

EN

The aerodynamics of transonic fans is discussed with emphasis on the use of three-dimensional design techniques, such as blade sweep and lean, to improve their performance. In order to study the interaction of these 3D features with the shock pattern a series of five different designs is produced and analysed by CFD. It is found that the 3D features have remarkably little effect on the shock pattern near the tip where the shock must remain perpendicular to the casing. Lower down the blade significant shock sweep, and hence reduced shock loss, can be induced by 3D design but this is usually at the expense of reduced stall margin and increased loss elsewhere along the blade span. Overall, very little change in efficiency is produced by blade sweep or lean. However, forwards lean of the rotor does produce a small increase in mass flow. Radial migration of the boundary fluid on the suction surface behind the shock is shown to play a large part in the aerodynamics near the blade tip.

Słowa kluczowe

EN

transonic fan; transonic compressor; three-dimensional flow; shock waves; CFD

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 2002
• Tom: Vol. 6, No 1
• Strony: 7--23
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Denton J. D.

• Cambridge University Engineering Department, Madingley Road, Cambridge, CB3ODY UK

Bibliografia

• [1] Calvert W J and Ginder R B 1999 Proc. Instn. Mech. Engrs., Part C, J. Mech. Eng. Sci. 213 (5) 419
• [2] Denton J D 1996 Proc. 3rd International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows, Beijing, China, pp. 3-14
• [3] Neubert R J, Hobbs D E and Weingold H D 1990 ,47,4,4 Paper 90-1915
• [4] Denton J D 1993 ASME J. Turbomachinery 115 (4) 621
• [5] Wadia A R, Szucs P N and Crall D W 1997 ASME Paper 97-GT-401
• [6] Denton J D 1994 AGARD LS 195, Turbomachinery design using CFD, Lecture 3, pp. 1-14
• [7] Denton J D and Xu L 1999 Proc. Instn. Mech. Engrs., Part C, J. Mech. Eng. Sci. 213 (2) 125.