Heat/mass transfer in an internally ribbed turbine blade coolant channel with vortex generators

Document Type

Conference Proceeding

Publication Date

12-1-1996

Abstract

The effect of different vortex generators on the mass (heat) transfer from the ribbed passage of a two pass turbine blade coolant channel is investigated with the intent of optimizing the vortex generator geometry so that significant enhancements in mass/heat transfer can be achieved. Two different types of vortex generators are studied: (a) vertical cylinders that are mounted normal to the ribs and (b) delta wings mounted at different angles on the rib surface. All four walls along each channel pass are active and have mass transfer from their surfaces, but the ribs (mounted on two opposite surfaces only) and the vortex generators are non-participating. Results are presented for Reynolds number in the range of 5,000 to 30,000, pitch to rib height ratios of 10.5 and 21, and vortex generator-characteristic dimension to rib height ratios of 1 and 2. Centerline and spanwise averaged Sherwood number ratios are presented along with contours of the Sherwood number ratios. Results indicate substantial increases due to the vortex-generators in the local mass transfer rates, and modest increases in the average mass transfer rates.

Publication Source (Journal or Book title)

American Society of Mechanical Engineers (Paper)

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