Full Content is available to subscribers

Subscribe/Learn More  >

Numerical Optimization of Stator Blade Sweep and Lean in an LP Turbine Stage

[+] Author Affiliations
Piotr Lampart

Polish Academy of Sciences, Gdańsk, Poland

Paper No. IJPGC2002-26161, pp. 579-592; 14 pages
  • 2002 International Joint Power Generation Conference
  • 2002 International Joint Power Generation Conference
  • Scottsdale, Arizona, USA, June 24–26, 2002
  • Conference Sponsors: Power Division
  • ISBN: 0-7918-3617-7 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME


The paper describes results of direct constrained optimization of stator blade axial sweep and circumferential lean for the exit stage of a large power steam turbine, using Nelder-Mead’s method of deformed polyhedron. Values of the minimised objective function, that is stage losses with the exit energy are found from 3D viscous compressible computations. Turbulence effects are taken into account using Menter’s SST model. Among the optimized parameters are stator and rotor stagger angles, stator straight sweep and straight lean, stator compound sweep at the tip and compound lean at the root, giving the total number of 8 optimized parameters. The blade sections (profiles) are assumed not to change during the optimization. There are constraints imposed on the mass flow rate, exit swirl angle and reactions. A number of optimization runs is reported. First, optimization of the exit stage with stator blade circumferential lean, second, optimization of the stage with stator blade axial sweep, then, the stage is optimized with both sweep and lean of stator blades. In the above tasks, the process of optimization is carried out for a nominal load, however, due to the fact that exit stages of steam turbines operate over a wide range of flow rates away from the nominal conditions, the original and final geometries are also checked for low and high loads. Optimization gives designs with new 3D stacking lines of stator blades, and with significantly increased efficiencies, over large part of the assumed range of load, compared to the original design.

Copyright © 2002 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In