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Impeller Design for Radial and Mixed Flow Compressors

[+] Author Affiliations
Reinhard Pauer

Technische Universität Dresden

Norbert Müller

Michigan State University

Paper No. IMECE2004-61926, pp. 187-193; 7 pages
doi:10.1115/IMECE2004-61926
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Process Industries
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Process Industries Division
  • ISBN: 0-7918-4717-9 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

An impeller design algorithm implemented in a computer code is presented. It can be used for designing radial and mixed flow impellers for compressors, blowers and fans. The implemented algorithm allows finding suitable impeller geometries considering fluid mechanical and technological aspects. Based on the input of main design parameters for the stage (like tip diameter, rotational speed, through flow, and specific energy transfer), first the feasibility of the given combination of input values is checked, and possible design ranges are determined (like for outlet blade angles, inlet diameter, and outlet width). After choosing the final design parameter within the possible range, a mean line blading is generated. Then the algorithm allows optimizing the blading geometry, velocity distribution, and blade loading by changing the mean streamline. The mean line blading then serves as a basis for generating the complete 3D blading, distributing the blade loading in a way that favorable velocity distributions are obtained throughout the impeller and that the obtained blade geometry is acceptable. Finally the blading generated according to fluid mechanical aspects can be adapted to technological constrains by changing geometric parameters and overlaying a thickness distribution. During this process the velocity distributions are always re-evaluated using the streamline curvature algorithm by Stanitz und Prain. Despite friction is neglected, experience has shown that the obtained results allow a good evaluation of the aerodynamic quality of the impeller design.

Copyright © 2004 by ASME

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