GoR AD OPEN TECHNICAL PUBLICATIONS

GARTEUR TP 143

Prediction of performance degradation due to icing for 2d configurations / A. Feo et al. - GARTEUR TP 143. July 2003

Summary:

This Report summarises the work performed by the GARTEUR (AD) Action Group 32 (AG-32) during its planned extension, between June 1999 and June 2002. Participants in the AG were:

Aerospatiale (now Airbus France), CIRA, DERA (now QinetiQ), DLR, Eurocopter France, INTA, NLR, ONERA and SAAB. DLR joined the Group in 2000 and SAAB reduced its involvement after 2001. The work objective was to calculate the performance degradation due to ice accretion geometry in 2D configurations, with existing numerical codes, and to assess them with experiments available on the open literature, in agreement with the proposal established by the previously corresponding GARTEUR Exploratory Group.

Test Cases for study include the effects of simulated leading edge roughness, a smooth glaze ice shape, a rough glaze ice shape case including a sub-case with residual ice on the same aerofoil followed by another case which considers the same effects as the previous one but with a flap deployed. Finally, Mach number effects have been calculated for two different iced rotor aerofoils.

Computational results show, in general, acceptable agreement with experiments for low angles of attack, but show considerable differences as the stall condition is approaching, being unable to cope with the post-stall flow behaviour. The calculated simulated-roughness effects do not correspond to real "ice roughness" because of differences of scale, shape and distribution of the roughness elements and demonstrate clearly that more studies are needed in this particular subject.

On the side of experimental results, the open literature has shown important limitations when intended for code validation of performance degradation studies, and specific, well designed experiments will be needed in this area in the future.

For a complete copy of the document, contact with GARTEUR Secretary.

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