Parametric Experimental and Numerical Study of LP Diffuser and Exhaust Hoods

Derek Taylor, Gurnam Singh, Phil Hemsley, Martin Claridge

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

5 Citations (Scopus)

Abstract

The design of an effective diffuser for a given last stage blade of an LP turbine is known to be highly dependent on the size and shape of the exhaust hood in which it is located. For retrofit steam turbines in particular, where a new last stage blade and diffuser are fitted into an existing exhaust hood, the shapes and sizes of the exhaust box have been seen to vary significantly from one contract to the next. An experimental parametric study of diffuser lips and exhaust hood configurations has been run on a model test turbine rig at GE Power to investigate the impact of various geometric parameters on the performance of the diffusers. Improved testing and post-processing methodologies means the diffuser performance has been obtained for a greater number of geometric configurations than was previously typically possible. The results of these experiments are compared with numerical calculations and confirm the accuracy of the standard in-house diffuser design tools. Key geometric parameters are identified from the test data and used to generate improved diffuser design guidelines.
Original languageEnglish
Title of host publicationASME Turbo Expo 2016
Subtitle of host publicationTurbomachinery Technical Conference and Exposition
Number of pages10
Volume8
ISBN (Electronic)978-0-7918-4986-6
DOIs
Publication statusPublished - 20 Sep 2016
Externally publishedYes
EventASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition - Seoul, Korea, Republic of
Duration: 13 Jun 201617 Jun 2016

Conference

ConferenceASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
CountryKorea, Republic of
CitySeoul
Period13/06/1617/06/16

Keywords

  • Steam Turbines
  • Diffusers
  • Exhaust Systems
  • Design
  • LAst Stage Blades

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    Taylor, D., Singh, G., Hemsley, P., & Claridge, M. (2016). Parametric Experimental and Numerical Study of LP Diffuser and Exhaust Hoods. In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition (Vol. 8). [GT2016-56640, V008T26A017] https://doi.org/10.1115/GT2016-56640