Research Papers: Two-Phase Flow and Heat Transfer

Two-Phase Flow Simulation of Mist Film Cooling on Turbine Blades With Conjugate Internal Cooling

[+] Author and Article Information
Xianchang Li1

Energy Conversion and Conservation Center,  University of New Orleans, New Orleans, LA 70148-2220

Ting Wang2

Energy Conversion and Conservation Center,  University of New Orleans, New Orleans, LA 70148-2220twang@uno.edu


Present address: Lamar University, TX.


Corresponding author.

J. Heat Transfer 130(10), 102901 (Aug 08, 2008) (8 pages) doi:10.1115/1.2944247 History: Received July 10, 2007; Revised November 28, 2007; Published August 08, 2008

Effective cooling of gas turbine combustor liners, combustor transition pieces, turbine vanes (nozzles), and blades (buckets) is a critical task to protect these components from the flue gas at extremely high temperature. Air film cooling has been successfully used to cool these hot sections for the past half century. However, the net benefits from the traditional methods seem to be incremental, but the temperature of working gas is continuously increasing to achieve high thermal efficiency. Therefore, new cooling techniques need to be developed. One of the promising techniques is to enhance film cooling with mist injection. While the previous study reported the effect of mist on the cooling effectiveness with an adiabatic wall, this paper focuses on the effect of mist injection on heat transfer of film cooling with a nonadiabatic flat wall, using the commercial computational fluid dynamics software package FLUENT . Both 2D and 3D cases are considered with a 2D slot and diffusive compound-angle holes. Modeling of the interaction of a droplet with a uniformly cooled wall as well as conjugate heat conduction inside the solid base are conducted. Different mist droplet sizes and mist concentrations are adopted. Conditions both in a gas turbine operating environment (15 atm and 1561 K) and in a laboratory environment (1 atm and 450 K) are considered. Results show that injecting 2–10% mist reduces the heat transfer coefficient and the wall temperature. Especially, mist has the prolonged effect of cooling the region downstream for 15 jet hole diameters, where conventional air film cooling is not effective.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Computational domain and cooling hole configurations

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Figure 2

Validation of numerical procedure

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Figure 3

Computational meshes

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Figure 4

Temperature field and droplet trajectories with the 3D compound-angle hole

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Figure 5

Flow field on planes perpendicular to the mainstream direction for the 3D compound-angle hole case (colored by temperature)

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Figure 6

Heat transfer results of the 3D case with the compound-angle hole over a uniformly cooled base wall under GT operating conditions (15 atm and 1561 K)

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Figure 7

Effects of (a) droplet size and (b) mist concentration on film cooling with the compound-angle diffuse hole over a uniformly cooled base wall under GT operating conditions (15 atm and 1561 K)

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Figure 8

Heat transfer result of the 2D slot case at low operational conditions (1 atm and 450 K)

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Figure 9

Temperature distribution of 2D film cooling with conjugate heat transfer

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Figure 10

Heat transfer result of mist film cooling of a 2D slot jet with a conjugate wall cooling




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