Abstract
The development of an air jet retrieval system of the gravel scattered on the road surface for the slip prevention is studied. The purpose of this study is to clarify the optimum installation condition of the jet nozzle for blowing the gravel. The height of the nozzle exit was h=5mm, and the width was 50mm. In changing blowing angle θ of the jet and standoff distance from the road surface y_0,the blow off regions of the gravel were photographed and velocity distributions over the road surface were measured by hot-wire anemometer. As the result, optimum installation condition of the jet nozzle were found to be y_0/h=2〜3 and θ=15°∿20°, Where the blow off distance of gravel is increased.
