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A Model for Radial Flow Turbine Performance in Highly Unsteady Flows

[+] Author Affiliations
Xiao Hu, Patrick B. Lawless

Purdue University, West Lafayette, IN

Paper No. 2001-GT-0312, pp. V001T03A016; 8 pages
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7850-7
  • Copyright © 2001 by ASME


This work was focused on the development of models for turbomachinery unsteady performance that could capture the significant aspects of fluid inertia effects, and thus provide insight into performance in highly unsteady flows. The application chosen for this approach was the turbine from a pulse-turbocharged diesel engine turbocharger, where the flow unsteadiness in on the order of the mean flow. The Euler Equation with Source Terms (EEST) technique was employed, with the rotor modeled in the relative reference frame. The results of this approach showed the ability to accurately predict the dynamics of a twin-entry turbine operating in an on-engine environment. In general, the modeling approach is valid for any compression or expansion system where the reduced frequency is high enough to suggest that unsteadiness is important, while at the same time low enough that that viscous effects may be quasi-steady. Possible applications would be predictions for aircraft engine compressions systems with unsteady inlet distortions, start up transients in a broad class of turbomachines, and any radial flow systems operating with significant inlet or exit volute generated distortions.

Copyright © 2001 by ASME



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