Control of Shock-Wave/Bound-Layer Interactions by Bleed

Abstract

Bleeding away a part of the boundary layer next to the wall is an effective method for controlling boundary-layer distortions from incident shock waves or curvature in geometry. When the boundary-layer flow is supersonic, the physics of bleeding with and without an incident shock wave is more complicated than just the removal of lower momentum fluid next to the wall. This paper reviews CFD studies of shock-wave/boundary-layer interactions on a flat plate with bleed into a plenum through a single hole, three holes in tandem, and four rows of staggered holes in which the simulation resolves not just the flow above the plate, but also the flow through each bleed hole and the plenum. The focus is on understanding the nature of the bleed process.

Impact performance for high frequency hydraulic rock drill drifter with sleeve valve

“…3 according to the references [12][13]. The impact energy test system for hydraulic rock drill drifter is composed by strain bridge, pressure sensor, flow sensor, WS data collector, Synergy multi-channel waveform recorder, and so on [14], which uses the arm and hydraulic oil source to build test platform shown as Fig. 4.…”