ABSTRACT:

An icing laboratory facility has been set up at Université du Québec à Chicoutimi to evaluate the ice holdover times and the aerodynamic performances of commercial ground de/antiicing products. Ice holdover and aerodynamic performances of deicing and antiicing fluids are established through three standard laboratory tests: the Water Spray and High Humidity Endurance Tests, carried out m a climate chamber, and the Flat Plate Elimination Test, conducted in a cold wind tunnel. UQAC facility qualities for certification of commercial products under these AMS and AEA standard tests. This paper aims to describe the testing procedures recently implemented at UQAC icing laboratory for de/antiicing fluid evaluation and other research activities in this area.

INTRODUCTION

All precipitation below O°C tends to produce solid deposits on the aircraft body. These deposits are known to modify the aerodynamic performance, reducing lift and increasing drag (Zierten and Hill, 1987). To prevent these ill effects on aircraft, various deicing and anti icing schemes have been developed. The purpose of deicing is to remove all forms of ice deposit while the aircraft is on the ground waiting for takeoff. This is achieved by a combination of mechanical, thermal and chemical actions: projection of hot water, sometimes mixed with ethylene and propylene glycols. The object of antiicing is to prevent formation of ice deposit. Antiicing fluids are much thicker than deicing fluids as a result of the introduction of large polymers to the water-glycol solution. However, the work of Boeing Company in collaboration with the NASA Lewis Research Center (Nark, 1983; Hill, 1990) and the Von Karman Institute for Fluid Dynamics (Carbonaro, 1986 and 1987) has demonstrated that significant amount of the thickened fluid was left on the wing at the time of liftoff, and consequently, aerodynamic penalties were, once again, detected.

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