RECENT DEVELOPMENTS IN SCALING METHODS FOR ICING WIND TUNNEL TESTING AT REDUCED SCALE

This paper is concerned with reduced scale testing of in-flight ice accretion on aircraft surfaces. A basic description of the icing process is presented and the reason for occurrence of two types of icing, rime and glaze, is explained. Important physical phenomena are highlighted, including phenomena whose importance is not widely recognized. The implied modelling requirements are outlined and discussed. It is shown that the requirements can be readily satisfied for rime icing conditions and that good reduced scale test results can be obtained. For glaze icing on the other hand, not all of the scaling requirements are known. Recent developments in this area are outlined and discussed in the light of experimental results obtained by the authors and others.