Abstract
The conventional air pressure shot peening process consists of multiple impacts of particles propelled with pressurized air through a nozzle at the surface of mechanical components. An experimental study of the flow of particles exiting the nozzle was conducted. A high speed camera was used for image acquisition of the particle flow. This particle flow was analyzed using a particle tracking (PT) technique and using a digital image correlation (DIC) technique. Those two methods were compared and applied to the characterization of an industrial shot peening flow with several parameters of jet pressure and mass flow rate.
Highlights
Shots of particles are present in the study of many processes at many scales
The flow of shot peening particles ahead of a straight nozzle of diameter 10 mm with S230 steel shots was characterized in 2D, for different process parameters, using a high speed camera
– Using TrackMate module and Matlab, the tracks of each particle were detected for Particle Tracking (PT) and a velocity field was obtained
Summary
Shots of particles are present in the study of many processes (particle injection, spray combustion, particle laden flows, blasting and conventional shot peening) at many scales. This study aims to analyse the particle flow ahead of a shot peening nozzle where steel beads (i.e. particles) are projected on a mechanical surface. In jet flow engineering [1], the jet ahead of the nozzle is described by a turbulent behavior. A potential core region is formed near the nozzle exit. In this region, the velocity is usually assumed to be constant. The velocity is usually assumed to be constant This potential core region is surrounded by a mixing region until the jet becomes fully developed forming the developed region. Shakouchi [1] expresses the size of the core region as 5.d independently of the air pressure, where d is the diameter of the nozzle
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