The problem of gradual opening in wave rotor passages

Abstract

The influence on the flow pattern of the gradual passage opening in the wave rotor is studied on the basis of numerical simulation. It is found that, in most cases, significant volume of the passage will have rotational flow, which should lead to the mixing between the driver and driven gases. In some cases, losses will occur also as a result of the multiple reflection of the shock and pressure waves from the passage walls. It is shown that the interface between driven and driver gas will be oblique to the passage walls, when the passage opens gradually, and the interface can retain its obliqueness to the walls.