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CFD Investigation of the Influence of Inflow Conditions on an Aggressive Axial Exhaust Diffuser for Steam Turbines

[+] Author Affiliations
Lei Xu, Lars Hedlund, Åsa Nilsson

Siemens Industrial Turbomachinery AB, Finspong, Sweden

Paper No. GT2014-26549, pp. V01BT27A038; 9 pages
doi:10.1115/GT2014-26549
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4558-5
  • Copyright © 2014 by ASME

abstract

The aerodynamic performance of an aggressive axial steam turbine exhaust diffuser is investigated. CFD simulations are carried out with the last stage rotor included. As expected, results reveal that the last stage tip leakage has a significant influence on the performance of the diffuser. A comparison is made with results from calculations of a conservative diffuser. This shows that although the high total pressure in the tip leakage jet helps to prevent casing separation, it can ruin the recovery if the diffusion is too low. Then the high velocity at the casing can reach the outlet of the diffuser, resulting in a more non-uniform exit flow distribution. This in turn reduces the pressure recovery. This effect is of special importance when the non-dimensional length is short, as for the investigated diffusers.

Copyright © 2014 by ASME

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