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Numerical Study of the Effects of Bowed Blades on Aerodynamic Characteristics in a High Pressure Turbine

[+] Author Affiliations
Mohsen Hassan Vand, Songtao Wang

Harbin Institute of Technology, Harbin, China

Paper No. GT2005-68214, pp. 487-496; 10 pages
doi:10.1115/GT2005-68214
From:
  • ASME Turbo Expo 2005: Power for Land, Sea, and Air
  • Volume 6: Turbo Expo 2005, Parts A and B
  • Reno, Nevada, USA, June 6–9, 2005
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4730-6 | eISBN: 0-7918-3754-8
  • Copyright © 2005 by ASME

abstract

A commercial N-S solver has been employed for simulating the unsteady flow field and analyzing aerodynamic characteristics in a steam turbine stage with low aspect ratio in two cases, one with straight and the other with bowed stator blades. The stator and rotor trailing edge wakes have been studied and compared for two cases. In blade-to-blade view, it was observed that the strength, position and the width or range of influence of wakes in bowed stator blades are bigger than those of straight blades. This effect causes remarkable changes in rotor flow and rotor trailing edge wakes. By analyzing the wake-induced turbulence, it was found that there is a periodic distribution for stator trailing wakes along the radial direction in straight blades, while for bowed blades; the distribution is concentrated towards the midspan. The bowing of stator blades causes the rotor trailing wakes to be greatly strengthened near the hub and casing. The blade loading distribution, viscous dissipation and rotor tip leakage flow for straight and bowed blades are compared in detail to show the aerodynamic performance of stator blade bowing.

Copyright © 2005 by ASME

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