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Abstract
This paper presents the results of an experimental study of the erosion of a cohesionless sand bed by obliquely impinging plane turbulent air jets. The jet, with velocity of 20.1-49.2 m/s and width at the nozzle, 2bo, of 4.7 mm, impinged on the bed at angles varying from 15 to 60°. The uniform sand bed had a mean particle size of 1.2 or 2.38 mm. Several characteristic dimensions of the scour hole were measured and found to depend mainly on the impingement angle and the erosion parameter Fo/(H/2bo)0.5, where Fo is the densimetric Froude number, and H is the impingement distance. Correlations were developed for the main characteristics of erosion at asymptotic state. As well, comparisons were made with the erosion of sand beds by obliquely impinging submerged plane water jets. The differences in the scour produced by the air and water jets were found to be significant.