Turbulent transport on the endwall in the region between adjacent turbine blades

Journal Article · Tue Nov 01 00:00:00 EST 1988 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3250586· OSTI ID:5414132

Goldstein, R J; Spores, R A ^[1]

---

1. Univ. of Minnesota, Minneapolis (USA)

The complex three-dimensional flow in the endwall region near the base of a turbine blade has an important impact on the local heat transfer. The initial horseshoe vortex, the passage vortex, and resulting corner vortices cause large variations in heat transfer over the entire endwall region. Due to these large surface gradients in heat transfer, conventional measurement techniques generally do not provide in accurate determination of the local heat transfer coefficients. In the present study the heat/mass transfer analogy is used to examine the local transport coefficients for two different endwall boundary layer thicknesses and two free-stream Reynolds numbers. A linear turbine blade cascade is used in conjunction with a removable endwall plate. Napthalene (C{sub 10}H{sub 8}) is cast into a mold on the plate and the rate of naphthalene sublimation is determined at 6,000+ locations on the simulated endwall by employing a computer-aided data acquisition system. This technique allows one to obtain detailed contour plots of the local convection coefficient over the entire endwall. By examining the mass transfer contours, it is possible to infer information on three-dimensional flow in the passage between the blades. Extremely high transport coefficients on the endwall indicate locations of potential overheating and failure in actual turbine.

• OSTI ID: 5414132
• Journal Information: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Vol. 110:4A; ISSN 0022-1481
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
GAS TURBINE ENGINES
HEAT TRANSFER
DATA ACQUISITION SYSTEMS
MASS TRANSFER
MEASURING METHODS
NAPHTHALENE
SUBLIMATION
TEMPERATURE DISTRIBUTION
VORTICES
AROMATICS
CONDENSED AROMATICS
ENERGY TRANSFER
ENGINES
EVAPORATION
HEAT ENGINES
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
ORGANIC COMPOUNDS
PHASE TRANSFORMATIONS
330103* - Internal Combustion Engines- Turbine