In the field of axial flow turbomachines, the two–dimensional cascade model is often used experimentally or numerically to investigate fundamental flow characteristics and overall performance of the impeller. The core of the present work is a design method for axial fan cascades aiming to derive inversely the optimum blade shape based on the requirements of the impeller and not using any predefined airfoil profiles. While most design strategies based on the airfoil theory assume constant total pressure at all streamlines, i.e. free–vortex flow, this paper investigates the possibility of varying the total pressure along the blade and based on that, an analytical expression of the outlet blade angle is determined. When computing the blade profile at specified radius, critical parameters reflecting on the flow characteristics are observed and adjusted, i.e. sufficient lift and controlled deceleration of the flow on the contour so that the resulting profile is derived for minimum losses. The validation of this design strategy is given by the numerical results obtained when employed as an optimization tool for an industrial fan: 10–20% absolute increase in the efficiency of the optimized impeller.
Skip Nav Destination
ASME 2008 International Mechanical Engineering Congress and Exposition
October 31–November 6, 2008
Boston, Massachusetts, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4871-5
PROCEEDINGS PAPER
Parmeterization of the Total Pressure Distribution Along a Low-Pressure Axial Fan Blade According to the Design Requirements
Maria Pascu,
Maria Pascu
Friedrich-Alexander University - Erlangen-Nuremberg, Erlangen, Germany
Search for other works by this author on:
Philipp Epple,
Philipp Epple
Friedrich-Alexander University - Erlangen-Nuremberg, Erlangen, Germany
Search for other works by this author on:
Antonio Delgado,
Antonio Delgado
Friedrich-Alexander University - Erlangen-Nuremberg, Erlangen, Germany
Search for other works by this author on:
Franz Durst
Franz Durst
Fluids Measurements & Projects FMP Technology GmbH, Erlangen, Germany
Search for other works by this author on:
Maria Pascu
Friedrich-Alexander University - Erlangen-Nuremberg, Erlangen, Germany
Philipp Epple
Friedrich-Alexander University - Erlangen-Nuremberg, Erlangen, Germany
Antonio Delgado
Friedrich-Alexander University - Erlangen-Nuremberg, Erlangen, Germany
Franz Durst
Fluids Measurements & Projects FMP Technology GmbH, Erlangen, Germany
Paper No:
IMECE2008-66357, pp. 1343-1352; 10 pages
Published Online:
August 26, 2009
Citation
Pascu, M, Epple, P, Delgado, A, & Durst, F. "Parmeterization of the Total Pressure Distribution Along a Low-Pressure Axial Fan Blade According to the Design Requirements." Proceedings of the ASME 2008 International Mechanical Engineering Congress and Exposition. Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C. Boston, Massachusetts, USA. October 31–November 6, 2008. pp. 1343-1352. ASME. https://doi.org/10.1115/IMECE2008-66357
Download citation file:
17
Views
Related Proceedings Papers
Related Articles
Choking Phenomena in a Vortex Flow Passing a Laval Tube: An Analytical Treatment
J. Fluids Eng (April,2009)
Analysis of Vortical Flow Field in a Propeller Fan by LDV Measurements and LES—Part I: Three-Dimensional Vortical Flow Structures
J. Fluids Eng (December,2001)
Analysis and Validation of a Unified Slip Factor Model for Impellers at Design and Off-Design Conditions
J. Turbomach (October,2011)
Related Chapters
Operating Range
Design and Analysis of Centrifugal Compressors
Boundary Layer Analysis
Centrifugal Compressors: A Strategy for Aerodynamic Design and Analysis
History of Reinforced Concrete Low-Head Pressure Pipe Design
Concrete Pipe and Box Culverts