Measurement of local mass transfer from a gas-turbine blade
This study attempts to increase our understanding of the turbulent transport on a turbine blade of a planar cascade with and without the influence of the endwall. The naphthalene sublimation technique used has several advantages compared with direct heat-transfer measurement. Although the heat-transfer rate over a blade is not directly measured, the mass transfer results can be used to predict the heat-transfer results by applying the heat/mass transfer analogy. The mass-transfer measurements are conducted at two different exit Reynolds numbers, 171000 and 122000. Information about local transfer coefficients, over the entire turbine blade, was obtained at 9216 locations from four separate runs; two runs on the concave side and two on the convex side. The mass-transfer rate on the convex surface in the region near the endwall is found to be extremely high, a result of small but intense corner vortices. The effect of changing the inlet boundary-layer thickness on the mass transfer rate is also examined.
- Research Organization:
- Minnesota Univ., Minneapolis, MN (USA)
- OSTI ID:
- 5275348
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
034000* -- Natural Gas-- Combustion
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY LAYERS
DIMENSIONS
ENERGY TRANSFER
GAS TURBINES
HEAT TRANSFER
LAYERS
MACHINERY
MASS TRANSFER
MEASURING METHODS
REYNOLDS NUMBER
THICKNESS
TURBINE BLADES
TURBINES
TURBOMACHINERY
VORTICES