A Study of Pseudo-Shock : 1st Report, λ-Type Pseudo-Shock

Abstract

A pseudo-shock occurs, when a supersonic flow is decelerated to subsonic in a duct surrounded by walls. Its shape is influenced by the main stream Mach number and the condition of the boundary layer. In this study, the authors investigated the phenomena of the λ-type pseudo-shocks experimentally, and obtained the distribution of the static and total pressure in the duct in the pseudo-shock region. The results show that the mechanism of the pseudo-shock can be divided into two parts ; the first is the upstream region in which the supersonic flow is gradually decelerated to sonic, and in the second downstream region the high speed flow in the central core is mixed with the low speed flow near the walls.