Flow Characteristics of an Annular Intercooler-Diffuser for Gas Turbines PUBLIC ACCESS

[+] Author Affiliations
Ajay K. Agrawal, Alejandro Tinneti, Surbamanyam R. Gollahalli

University of Oklahoma, Norman, OK

Paper No. 98-GT-283, pp. V001T01A076; 10 pages
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 1: Turbomachinery
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7862-0
  • Copyright © 1998 by ASME


Benefits of intercooling in power generating gas turbines can be maximized by reducing stagnation pressure loss in the intercooler flow path without adversely affecting the flow pattern in compressors. The intercooler-diffuser isolates the low pressure compressor from the intercooler, recovers the static pressure by decelerating the compressor discharge flow, and uniformly supplies low speed air to the intercooler for effective heat exchange. An experimental investigation was carried out to obtain data in a conceptual design with two sections: an outwardly canted prediffuser and a dump. The test-section was a one-fourth scale model of a typical industrial gas turbine. The diffuser flow is described in terms of the pressure recovery and loss coefficients, velocity vectors, static and stagnation pressure distributions, and the mean velocity and turbulence intensity profiles. The flow resistance by the intercooler was simulated to assess its effects on the upstream diffuser flow. The airflow rate was varied to obtain data at full and part-load operations. The inlet conditions corresponded to naturally developed axisymmetric annulus flow. Results show high stagnation pressure loss and distorted velocity profiles in the dump because of flow recirculation next to the casing. Pressure recovery was confined to the prediffuser and a tail-section downstream of the dump where the flow reattached. Results show that the diffuser flow was practically unaffected by the intercooler and by operation at part-load.

Copyright © 1998 by ASME
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