Abstract
In gas-blast erosion, solid particles are accelerated along a parallel walled nozzle, but exit the nozzle as a diverging plume. Thus particles strike the target with a range of impact angles with some at large distances from the point on the target below the nozzle tip. The distribution of particle trajectories within the plume is well defined, and so for a given experimental geometry, the probability of a particle striking the target at a given point can be calculated. With this information and a mathematical function describing the angular dependence of erosion rate, the effect of particle plume divergence on the observed erosion rate and the spatial distribution of erosion has been calculated for both ductile and brittle materials. Plume divergence can have a significant effect on the observed erosion rate of both brittle and ductile materials, although the effects are much larger for ductile materials. Values of the plume focus coefficient of greater than 20 are recommended to ensure that the effects of plume divergence on the measured erosion rate are minimised.
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