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Dynamic Modeling of Starting Aerodynamics and Stage Matching in an Axi-Centrifugal Compressor FREE

[+] Author Affiliations
Kevin Wilkes, Walter F. O’Brien

Virginia Polytechnic Institute and State University, Blacksburg, VA

A. Karl Owen

U.S. Army Vehicle Propulsion Directorate, Cleveland, OH

Paper No. 96-GT-278, pp. V005T16A014; 7 pages
doi:10.1115/96-GT-278
From:
  • ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General
  • Birmingham, UK, June 10–13, 1996
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7876-7
  • Copyright © 1996 by ASME

abstract

A DYNamic Turbine Engine Compressor Code (DYNTECC) has been modified to model speed transients from 0–100% of compressor design speed. The impetus for this enhancement was to investigate stage matching and stalling behavior during a start sequence as compared to rotating stall events above ground idle. The model can simulate speed and throttle excursions simultaneously as well as time varying bleed flow schedules. Results of a start simulation are presented and compared to experimental data obtained from an axi-centrifugal turboshaft engine and companion compressor rig. Stage by stage comparisons reveal the front stages to be operating in or near rotating stall through most of the start sequence. The model matches the starting operating line quite well in the forward stages with deviations appearing in the rearward stages near the start bleed. Overall, the performance of the model is very promising and adds significantly to the dynamic simulation capabilities of DYNTECC.

Copyright © 1996 by ASME
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