Experimental Study and Analysis of Ice Crystal Accretion on a Gas Turbine Compressor Stator Vane 2019-01-1927
A significant number of historical engine powerloss events have recently been attributed to ingestion of high altitude ice crystals, prompting regulators to expand engine certification envelopes to incorporate ‘ice crystal icing’ conditions. There has been a resulting push to develop analytical and semi-empirical models for the phenomenon, partly using rig tests.
A new numerical model, the Ice Crystal Icing ComputationaL Environment (ICICLE) has been developed by the University of Oxford. The current study presents results and analysis of experiments conducted in the National Research Council’s Research Altitude Test Facility (RATFac). The experiments used a prismatic stator test article, designed to produce validation data for ICICLE. Accretion growth rates, extracted from backlit shadowgraphy, are presented as a function of test condition, in conjunction with qualitative assessments of the accretion quality and build/shed behaviour. The algorithm and results of a new image processing technique using Canny filtering are also presented.
Alexander Bucknell, Matthew McGilvray, David Gillespie, Liam Parker, Peter Forsyth, Hassan Saad Ifti, Geoffrey Jones, Benjamin Collier, Alasdair Reed
University of Oxford, University of Queensland, Rolls-Royce Plc
International Conference on Icing of Aircraft, Engines, and Structures