Dynamics and structure of pressure jumps in non-Riemann gas dynamics

The paper considers the problem of pressure wave generation in a gap of two co-axial tubes under the effect of shock wave propagating in the central tube filled in, particularly, with gas. The existence of “transonic situation” is revealed when the shock wave can overtake the pressure jump generated by it in a gap, i.e. run away from it. The result of such overtaking is the jump “break”. Such situation can never take place in Riemann gas dynamics.