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An experimental-numerical method for transient infrared measurement of film cooling effectiveness and heat transfer coefficient in a single test

Published online by Cambridge University Press:  05 August 2019

Nicholas E. Holgate ,
Peter T. Ireland  and
Eduardo Romero
Nicholas E. Holgate*
Affiliation:
The University of Oxford Department of Engineering Science Oxford, United Kingdom
Peter T. Ireland
Affiliation:
The University of Oxford Department of Engineering Science Oxford, United Kingdom
Eduardo Romero
Affiliation:
Rolls-Royce plc Aerothermal Bristol, United Kingdom
*
nicholas.holgate@eng.ox.ac.uk
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Abstract

An experimental technique for assessing film cooling performance is proposed which can determine both film effectiveness and heat transfer coefficient distributions from a single infrared experiment. First, the film effectiveness is determined in the experiment’s steady-state phase on a series of film-cooled nozzle guide vane leading edge geometries made of a low thermal conductivity foam. Then, the effectiveness is used to calculate the distribution of the transient phase driving gas temperatures, which is applied to a finite element conduction model. Heat transfer coefficients are guessed and iteratively refined until the surface temperature histories predicted by the finite element model match those which were experimentally observed. Unlike conventional methods based on one-dimensional analytical heat transfer solutions, this approach does not require assumptions about the material thickness underlying the test surface or the uniformity with depth of its initial temperature distribution. This relieves certain experimental constraints and reduces uncertainty in results.

Keywords

heat transferfilm coolingturbine cooling
Type
Research Article
Information
The Aeronautical Journal , Volume 123 , Issue 1270 , December 2019 , pp. 1982 - 1998
Copyright
© Royal Aeronautical Society 2019 

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Footnotes

A version of this paper was presented at the 24th ISABE Conference in Canberra, Australia, September 2019.

References

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