GoR AD OPEN TECHNICAL PUBLICATIONS

GARTEUR TP 144

Ice accretion prediction on aircraft components / J C. Artiles, S. Aschettino,V. Brandi , G. Duprat, A. Feo , R. Henry, R. Gent, M. Guerra, M. Gustafsson, S. Kommallein , J. C. Le Balleur - GARTEUR TP 144. August 2003

Summary:

Ice deposits on aircraft surfaces affects the aerodynamic performance of its lifting and control components and directly influences its safety of flight, being the cause of accidents involving numerous fatalities. For this reason, the civil certification authorities require all aircraft to comply to a complete ice certification process. The demand of these regulations calls for maintaining safe flight in all established icing conditions. Flight testing in real icing conditions is mandatory, but in order to minimize hazards, save time and reduce costs, different types of simulation methods are increasingly proving helpful tools, in the determination of ice accretion shapes and performance degradation of the aerodynamic characteristics of the air vehicle. Development of accurate numerical codes will help manufacturers in the design of effective and efficient ice protection systems and power plant integration.

In the framework of GARTEUR organization, both Groups AG32 and AG33 worked in that direction. Through numerical calculations, they intend to verify the degree of agreement of existing codes with experimental results for ice accretion determination (AG33) and global aerodynamic coefficients calculations (AG32).

This report presents the work performed by GARTEUR (AD) Action Group 33 in the period between initial meeting in June 1999 and June 2002. The participants in the AG were Airbus France, CIRA, Eurocopter, INTA, ONERA, QINETIQ and Saab. DLR joined the group in 2000, and Saab reduced his involvement after 2001.

Keeping in mind the main objective which is the assessment of numerical tools for the ice accretion determination, the program was structured in five work packages dealing with different aspects of the problem. Involvement of partners in these work packages varied according with resources and relative interest in some specific aspect.

Work Package 1 is a review of experimental ice accretion data available on single and multi-element airfoils. This task involved all partners and was coordinated by QinetiQ.

Work Package 2 involves ice accretion calculations in some specific cases selected in WP1 in order to study the sensitivity of the flow-field computation. This work was coordinated by CIRA.

The original goal of Work Package 3 was to study the physics of 3D ice accretion on a swept wing called “lobster tail”, by performing basic experiment in a small icing wind tunnel. Due to resources limitation, ONERA was not able to perform the test in the framework of this group and this task was cancelled.

Work Package 4 coordinated by INTA addresses the question of the use of similarity laws for ice accretion scaling test and review the currently scaling practices with their limitations.

Work Package 5 is dealing with the simulation of ice protection systems and review the existing numerical tools and the requirements for new developments. This task is coordinated by Eurocopter.

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

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