Cavitation control using passive flow control techniques

Passive flow control techniques, and particularly vortex generators have been used successfully in a broad range of aero- hydrodynamics applications to alter the characteristics boundary layer separation. This study aims review how such techniques can mitigate extent impact cavitation incompressible flows. focuses first on characterize key physical principles. It then considers complete passive technologies, including surface conditioning roughness, geometry modification, grooves, discharge, injection, obstacles, generators, bubble generators. The reviewed typically delay suppress separation by decreasing pressure gradient at point. literature also identifies streamwise vortices that result transfer momentum from free stream near-wall low energy regions. area interest concerns hydraulic machinery, whose performance life span are susceptible cavitation. includes reduction efficiency fluctuations discharge flow, while greatly increase wear bearings, wearing rings, seals, impeller surfaces due excessive vibration erosion. In context, few studies shown positive effects controls centrifugal pumps, as total head efficiency. is conceivable new generation design systems may be possible if simple features conceived maximize power minimize losses There still, however, significant research gaps understanding factors manufacturing processes, lifetime, durability, essentially static optimized deliver improved over realistic operating conditions.