Choked conditions through an orifice plate vs de laval nozzle
Hi all,
It is clear to me that when looking at gas flow through pipe that both De laval nozzles (venturi) and orifice plates can become choked (mach 1 at/near throat) and accelerate flow. I understand that for large flow velocities,the de laval nozzle is much more appropriate for accelerating flow to super sonic velocities because it reduces turbulence and retains more energy. I read however that it is not possible to achieve super sonic conditions after an orifice plate choke. Can super sonic flow only be achieved by de laval nozzles or could you theoretically use an orifice plate despite its loss in efficiency?
In other words yes I do understand that with de laval nozzles once the flow is choked, the velocity at the choke is always M1, and the only way to increase the velocity after the choke it to increase the pressure before the choke, as decreasing the pressure after the choke will have no effect. Is this also true with orifice plates?
CB