Flow field in a single-stage model air turbine rotor-stator cavity with pre-swirled purge flow

D. M. Dunn, D. W. Zhou, K. Saha, Kyle Squires, R. P. Roy, Y. W. Kim, H. K. Moon

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

11 Scopus citations

Abstract

The present work applies a combined approach of experimental measurement and numerical simulation of the flow in a single-stage model gas turbine. Mainstream gas ingestion into the cavity is reduced by utilizing two axially overlapping seal rings, one on the rotor disk and the other on the stator wall. Additionally, pre-swirled purge air is injected into the rotor-stator cavity through the stator radially inboard of the two seal rings. Flow field predictions from the simulations are compared against experimental measurements of static pressure, velocity, and tracer gas concentration acquired in a nearly identical model configuration. The experiment chosen for simulation was performed for a main airflow Reynolds number of 7.86×104 at a rotor disk speed of 3000rpm with a rotational Reynolds number of 8.74×105, and purge air nondimensional flow rate cw = 4806. The simulation models a 1/14 sector of the cylindrical geometry consisting of four rotor blades and four stator vanes. Gambit 2.4.6 was used to generate the three-dimensional grids ranging from 10 to 20 million elements. Effects of turbulence were modeled using the single-equation Spalart-Allmaras as well as the realizable k-epsilon models. Computations were performed using FLUENT 6.3 for both a simplified frozen-rotor formulation (steady) and a subsequent time-dependent (unsteady) computation. The simulation results show symmetry in the pressure and velocity distributions across each pitch of the stator vanes, but larger scale structures across all four blade pitches are also realized. Velocity distributions were scrutinized in the rotor-stator cavity and are in reasonable agreement with the measurements. Static pressure and tangential velocity components are accurately predicted.

Original languageEnglish (US)
Title of host publicationASME Turbo Expo 2010
Subtitle of host publicationPower for Land, Sea, and Air, GT 2010
Pages2477-2487
Number of pages11
EditionPARTS A, B, AND C
DOIs
StatePublished - Dec 1 2010
EventASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 - Glasgow, United Kingdom
Duration: Jun 14 2010Jun 18 2010

Publication series

NameProceedings of the ASME Turbo Expo
NumberPARTS A, B, AND C
Volume7

Other

OtherASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010
CountryUnited Kingdom
CityGlasgow
Period6/14/106/18/10

ASJC Scopus subject areas

  • Engineering(all)

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