The paper deals with the internal passage and downstream flow field effects produced by the application of 3D design techniques on linear turbine cascades. In particular, the two design techniques generally called “lean” and “lean compound” (or “bowing”), have been applied to the same profile. The investigation has been carried out by means of both numerical and experimental tools. An extensive experimental campaign was originally performed on cylindrical straight blades in the transonic wind tunnel of LFM (Laboratorio di Fluidodinamica della Macchine) of the Politecnico di Milano. The large data base available has been then used as set of test cases in order to validate the set up of a CFD tool. Subsequently a leaned cascade has been investigated by means of both methods. Finally the effects of blade bowing have been analysed only with a computational approach. The contemporary application of the two tools allows to get deeply inside of the effects produced by the three different blade design techniques.

On the effects of leaning and bowing techniques on turbine cascades flow field: experimental and numerical analysis

D'IPPOLITO, GABRIELE;DOSSENA, VINCENZO;MORA, ALESSANDRO;PERSICO, GIACOMO BRUNO AZZURRO;
2004

Abstract

The paper deals with the internal passage and downstream flow field effects produced by the application of 3D design techniques on linear turbine cascades. In particular, the two design techniques generally called “lean” and “lean compound” (or “bowing”), have been applied to the same profile. The investigation has been carried out by means of both numerical and experimental tools. An extensive experimental campaign was originally performed on cylindrical straight blades in the transonic wind tunnel of LFM (Laboratorio di Fluidodinamica della Macchine) of the Politecnico di Milano. The large data base available has been then used as set of test cases in order to validate the set up of a CFD tool. Subsequently a leaned cascade has been investigated by means of both methods. Finally the effects of blade bowing have been analysed only with a computational approach. The contemporary application of the two tools allows to get deeply inside of the effects produced by the three different blade design techniques.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/242280
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