Erosion rate prediction and correlation technique for ceramic surfaces exposed to high speed flows of abrasive suspensions

摘要: Abstract We describe a simple method to predict (based on available erosion yield data) rates for cylindrical ceramic targets (e.g. circular tube coatings, leading edges of turbine blades, or the ceramic-lined target zone inside CFBC-cyclones) exposed high-speed abrasive particle-laden streams. Use is made convenient parameterization/extrapolation published laboratory results giving, in effect, average yields per particle impact ( ϵ p ) particular planar and projectile materials over range velocities, V , incidence angles, θ j sizes, ν . For given target/flow geometry we reduce engineering problem predicting absolute that multiplying readily calculated characteristic rate by universal dimensionless functions explicitly approximated here limit impacts particles large enough be undeflected slowed down local gas flow. Our which would associated with mainstream volume flux if all struck at normal velocity, U Dimensionless are cast terms following four parameters characterizing erodent/ceramic system interest: sensitivity (exponent n incident velocity; m appearing (cost i )) angle : l size (volume, ); reference yield, p,ref (here, evaluated = 100 ms −1 t o corresponding d μ m). Based our preliminary survey experimental data, provide table givin “best-fit” values parameters: required complete prediction spatially-averaged according present formalism. latter, useful closed-form approximations provided convex concave geometries high Stokes number limit. Moreover, correction factors developed account (Rosin-Rammler) distribution erodent mainstream, mainstreams not perpendicular cylinder axis. The more general case arbitrary (finite) numbers outlined. Using two numerical examples (convex edge coating stator blade, sector CFBC-cyclone), demonstrate casting data this suggested format greatly facilitates design calculations (or coatings) suspensions. Organizing empirical manner will also facilitate longer goal correlating each above-mentioned independently measurable physical properties participating materials.