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Static, Dynamic and Failure Behavior of a Novel Axial Composite Impeller for Water Chiller

[+] Author Affiliations
Qubo Li, Janusz Piechna, Norbert Mueller

Michigan State University, East Lansing, MI

Paper No. IMECE2010-39817, pp. 81-87; 7 pages
doi:10.1115/IMECE2010-39817
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4429-8
  • Copyright © 2010 by ASME

abstract

Centrifugal forces applied to an impeller due to spinning generate large stresses. Aerodynamic forces are also imparted on the blade varying with time. These two forces play different roles during compressor events. Damage accumulated from these events results in the fatigue failure of impeller material and structure. Therefore, it is important to design the impeller against fatigue failure. The finite element method has been used in the study of impeller fracture mechanics and is regarded as an important tool in the design and analysis of impeller structures. A novel axial composite impeller manufactured through filament winding technology was invented by Michigan State University to compress water vapor as refrigerant. In this study dynamic and fatigue behavior of this composite impeller were analyzed using commercial code ANSYS. To begin with, load cases were identified, calculated and evaluated. Static analysis was performed using a full 3-D finite element model and the critical zone where fatigue failure begins was extracted to determine life assessment positions. Secondly, aerodynamic forces imparted on the blade were obtained from FLUENT; so that damage from dynamic stresses could be calculated. Finally, based on the FEM and FLUENT simulation results, a linear damage accumulation model was employed as a damage estimation rule to predict life of the composite impeller. A conservative life of 6498 h is given by this method.

Copyright © 2010 by ASME

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