Film Cooling With Swirling Coolant Flow
Author(s)
K. Takeishi, Y. Oda, Y. Egawa & T. Kitamura
Abstract
This paper describes the experimental results of a new film cooling method
blowing through circular and shaped film cooling holes with swirling coolant
flow. The experiments have been conducted by using a low-speed wind tunnel.
The film cooling effectiveness on the flat wall was measured by using pressure
sensitive paint (PSP) techniques. In addition, the spatial distribution of the film
cooling effectiveness and flow field were measured by leaser induced
fluorescence (LIF) and particle image velocimetry (PIV), respectively. In the
case of the circular film cooling hole, the coolant jet penetration into the
mainstream is suppressed by the swirling motion of the coolant. As a result,
although the coolant jet is deflected in the pitch direction, the film cooling
effectiveness distribution on the wall keeps a higher value behind the cooling
hole over a long range. Additionally, the anti-kidney vortex structure
disappeared. For the shaped cooling hole, the coolant jet spreads wider in the
spanwise direction at the downstream. Thus, the pitch averaged film cooling
effectiveness at the downstream was 50% higher than that of the non-swirling
case.
Keywords: gas turbine, heat transfer, film cooling, PSP, LIF, PIV.
1 Introduction
Gas turbines are used for aircraft propulsion and land-based power generation.
Developments in turbine cooling technology play a critical role in increasing the
thermal efficiency and power output of advanced gas turbines. Gas turbine
blades are cooled externally by film cooling. This is achieved by injecting
relatively cooler air from the internal coolant passages out of the blade surface in
order to form a protective layer between the blade surface and hot gas-path flow.
The interaction between the film-cooling air and the mainstream, which is
Keywords
gas turbine, heat transfer, film cooling, PSP, LIF, PIV
Related Book
Other papers in this volume
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