Noncanonical Short Hole Jets-in-Crossflow for Turbine Film Cooling

[+] Author and Article Information
Michael W. Plesniak

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288plesniak@ecn.purdue.edu

J. Appl. Mech 73(3), 474-482 (Sep 26, 2005) (9 pages) doi:10.1115/1.2130359 History: Received December 17, 2003; Revised September 26, 2005

This paper presents a review of research done over the past several years at Purdue on non-canonical jets-in-crossflow. It is a retrospective and an integrative compilation of results previously reported as well as some new ones. The emphasis is on jets emanating from “short” holes, with length-diameter ratios of one or less. A canonical jet-in-crossflow configuration is one in which a fully developed jet issues from a long pipe fed by a large plenum, into a semi-infinite cross flow. The configuration presented here is noncanonical in the sense that jet issues from a short hole and thus the flow is unable to “adjust” to the hole, unlike the case of a long hole in which fully developed pipe flow can be attained. This is motivated by gas turbine film cooling applications. Experimental results acquired with particle image velocimetry will primarily be presented, with some complementary information gained from RANS simulations of the flow. Many different aspects of the problem have been investigated, and in this paper the focus will be on structural features within the hole and in the developing jet and crossflow interaction. A significant result is that the in-hole vortical structures, depending on their sense of rotation, tend to augment or weaken the primary counter-rotating vortex pair. This impacts global features such as jet trajectory and spreading.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of structural features of canonical jet-in-crossflow (adapted from Johnston and Khan, 1997)

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Figure 2

Schematic of jet supply plenum configurations

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Figure 3

Computational domain

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Figure 4

Top view of near-hole grid distribution (1∕2 grid density shown for clarity)

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Figure 5

Velocity field within hole at various locations (90deg short injection hole, counter-flow plenum, M=0.5)

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Figure 6

Comparison of computed and measured in-hole velocity field (a) in hole, 0.1D above plenum, (b) in hole, 0.1D before jet exit (90deg injection hole with co-flow plenum, M=1.0)

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Figure 7

Numerically predicted in-hole velocity field at hole centerline, M=0.5, co-flow plenum

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Figure 8

Free stream mean velocity field (90deg short injection hole, co-flow plenum, M=1.0)

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Figure 9

Cross sectional velocity and vorticity fields, planes 4–6 (90deg short injection holes, counter-flow channel, M=1.0). Main flow is out of page.

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Figure 10

Skin friction distribution around jets-in-crossflow, counter-flow channel, (90deg injection, L∕D=0.66, M=1.0

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Figure 11

Cross-sectional velocity fields and CRVP locations

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Figure 12

Interaction of in-hole vortices (IHCRVP) and primary jet CRVP




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