Optimum design of radial flow impellers for variable load operation
- Univ. di Napoli Federico II (Italy). Dipt. di Ingegneria Meccanica per l`Energetica
The authors present, in this paper, an improved methodology for optimum design of radial flow impellers. The base methodology was recently proposed by the authors and consisted of a mathematical optimization technique matched to a flow model based upon an inviscid ``quasi 3-D`` method linked to a prediction of the boundary layer growth along both blade and end-wall surfaces. The enhanced strategy proposed in the present paper utilizes a genetic optimization algorithm and a number of refinement steps. This allows an effective exploration of a wide range of the independent variables. The latter define the impeller geometry defined under several aspects related to blade curvature and twisting, inlet and discharge angles, axial and radial displacements. The objective of maximum in total-to-total efficiency for a given level of pressure ratio is pursued within constraints on load levels, inlet and discharge Mach numbers, peripheral velocity. In this paper, the authors also deal with the search of an impeller configuration for satisfactory performance in an assigned field of operation. Off-design could, in fact, emphasize some problems related to choking or flow separation which are satisfactory solved at the design point. The control exerted by the optimizing procedure on the flow model, also in terms of boundary layer development, is helpful for finding more impeller characteristics for a better fitting of the operating field.
- OSTI ID:
- 86015
- Report Number(s):
- CONF-941024-; ISBN 0-7918-1213-8; TRN: IM9534%%86
- Resource Relation:
- Conference: 8. COGEN-TURBO power congress and exposition: gas turbines in cogeneration and utility, industrial and independent power generation, Portland, OR (United States), 25-27 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of ASME cogen turbo power `94. IGTI-Volume 9; Kidd, H.A.; Cooke, D.H.; Fransson, T.H.; Greitzer, E.M. [eds.]; PB: 759 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Theoretical analysis of inertially irrotational and solenoidal flow in two-dimensional radial-flow pump and turbine impellers with equiangular blades
Aerodesign and performance analysis of a radial transonic impeller for a 9:1 pressure ratio compressor