Abstract
The flow through two sequentially connected Laval nozzles depends on the ratio of the two throat cross sections. If the second throat is wider than the first one, two different cases are distinguishable. In steady flows solutions with a single shock can occur if the second throat is relatively wide. Within a certain range of exit pressures, two different one-shock solutions are possible. Under these conditions the shock position depends hysteretically on the exit pressure. If the second throat is only slightly wider than the first one, either a one- or a two-shock solution can be present for the same exit pressure. The unsteady transition between these solutions that can be caused by a variation of the exit pressure with time, is investigated.
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