Velocity in a Seeded Free Jet Core System

Abstract

The velocity of pure gases and mixtures of N 2 + He and N 2 in a hypersonic free jet and in a free jet core skimmed in continuum flow was measured by a pulsed electron beam - ion time of flight technique. The velocity was always found near the theoretical limiting value for large Mach numbers even if oblique shocks, resulting from the skimmer of from the background pressure in the free jet core chamber, crossed the flow. These shocks in rarefied flow could be helpful for an enrichment of the heavy component in this special seeded beam technique, when a second skimmer works in free molecular flow.