Shock Induced Flow Through a Pipegap

摘要

The conclusions can be summarised as follows: 1. The development of the gap wave system was influenced by both Mach number and gapwidth. High Mach numbers resulted in the waves merging into a single standing shock while for lower Mach numbers there were distinct waves at steady state. The gapwidth mainly influenced the barrel shock development. For smaller gaps it was not evident but distorted the larger gap flow. 2. The downstream pipe flow was essentially controlled by the standing shock and upstream moving wavelets in the gap. It is initially unsteady but tends to steady state as the flow develops. The strength of the shock reduced rapidly with increasing gap width at small gaps. For the larger gaps it tends to become constant with increasing gapwidth. The standing shock is near the downstream pipe for wider gaps at a fixed Mach number. 3. The upstream flow is influenced by the expansion wave and tends to steady state. For lower Mach numbers, upstream moving wavelets influence the upstream flow as well.