ramjet/scramjet: what makes expanded gas to go out in the back not the front?

From: peter (nospam_at_nospam.com)
Date: 11/18/04 

To: sci-space-tech@moderators.isc.org
Date: Thu, 18 Nov 2004 04:03:22 GMT

In looking at a ramjet/scramjet diagram, it seems that the burnt gas would
want to go in both direction: towards both the inlet and the outlet. Since
there is no valve to prevent a back flow, why wouldn't this push the air out
of the inlet and stall the engine?

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