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research-article

Method for Accurately Evaluating Flow Capacity of Individual Film-Cooling Rows of Engine Components

[+] Author and Article Information
Benjamin Kirollos

Osney Thermofluids Laboratory, Department of Engineering Science, University of Oxford, Oxford, OX2 0ES, UK
ben.kirollos@oxford-flow.com

Thomas Povey

Osney Thermofluids Laboratory, Department of Engineering Science, University of Oxford, Oxford, OX2 0ES, UK
thomas.povey@eng.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4037028 History: Received November 02, 2016; Revised May 15, 2017

Abstract

A laboratory experimental method and analysis technique is presented for evaluation of individual film-cooling row flow capacity characteristics. The method is particularly suited to complex systems such as hot section nozzle guide vanes (NGV) with lossy feed system characteristics. The method is believed to be both more accurate and more experimentally efficient than previous techniques. The new analysis technique uses an experimentally calibrated network model to represent the complex feed system, and replaces the need for internal loss measurements, which are both demanding and inaccurate. Experiments are performed in the purpose-built University of Oxford Coolant Capacity Rig (CCR), a bench-top, blow-down type facility with atmospheric back-pressure. The design of the CCR is informed by the requirements to assess engine-scale film-cooled components rapidly, accurately and precisely. Improvements in the experimental method include a differential mass flow rate measurement method and a variable bypass flow. We demonstrate the method using two high pressure (HP) NGV designs: an engine part with relatively uncoupled (in terms of internal loss) cooling rows; and a laser-sintered part with highly coupled cooling rows. We show that the individual-row flow capacity of a HPNGV can be evaluated in the CCR in one day to a 2s precision of approximately 0.5% and a 2s accuracy (bias) of 0.6%. The importance of performing individual-row capacity measurements is demonstrated: failure to scale flow capacity on a row-by-row basis introduces an error of 30% in the engine situation.

Rolls-Royce plc
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