Abstract
A study is made of the two-dimensional steady flow of gas escaping from a circular gap formed when the ends of pipes move apart along their common symmetry axis. A study is made of the rearrangement of the flow from the shockless flow in the neighborhood of the symmetry axis to the shocked flow. A numerical investigation gave the value H* of the width of the gap at which the transition takes place from a shockless flow structure to one with a shock. A study is made of the influence on H* of the pressure ratio ɛa (ɛa = Pa/P0, where Pa is the pressure in the ambient space and p0 is the stagnation pressure) and the specific—heat ratio. Godunov's scheme [1] was used for the numerical realization.
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