Three-dimensional unsteady flow for an oscillating turbine blade and the influence of tip leakage
The results of two investigations, concerning the aerodynamic response of a turbine blade oscillating in a three-dimensional bending mode, are presented in this paper. The first is an experimental and computational study, designed to produce detailed three-dimensional test cases for aeroelastic applications and examine the ability of a three-dimensional time-marching Euler method to predict the relevant unsteady aerodynamics. Extensive blade surface unsteady pressure measurements were obtained over a range of reduced frequency from a test facility with clearly defined boundary conditions. The test data indicate a significant three-dimensional effect, whereby the amplitude of the unsteady pressure response at different spanwise locations is largely insensitive to the local bending amplitude. The computational results, which are the first to be supported by detailed three-dimensional test data, demonstrate the ability of the inviscid method to capture the three-dimensional behavior exhibited by the experimental measurements and a good level of quantitative agreement is achieved throughout the range of reduced frequency. Additional computational solutions, obtained through application of the strip methodology, reveal inadequacies in the conventional quasi-three-dimensional approach to the prediction of oscillating blade flows. The issue of linearity is also considered, and both experimental and computational results indicate a linear behavior o the unsteady aerodynamics. The second, an experimental investigation, addresses the influence of tip leakage upon the unsteady aerodynamic response of an oscillating turbine blade. Results are provided for three settings of tip clearance.
- Research Organization:
- Univ. of Durham (GB)
- OSTI ID:
- 20086944
- Journal Information:
- Journal of Turbomachinery, Vol. 122, Issue 1; Conference: 43rd International Gas Turbine and Aeroengine Congress and Exhibition, Stockholm (SE), 06/02/1998--06/05/1998; Other Information: PBD: Jan 2000; ISSN 0889-504X
- Country of Publication:
- United States
- Language:
- English
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