Can a Jet Engine be Created Using a Traffic Cone Design?

[Netcastern]

Would it be possible to make a working jet engine by simply having a structure like two metal cones stuck tip to tip (traffic cone shaped)? The idea is to get it going fast, inject fuel in the middle, have the fuel auto ignite due to compression heating in the front cone, and than use the back cone as a nozzle.

 

[A.T.]

http://en.wikipedia.org/wiki/Ramjet

 

[enorbet]

It might be more efficient if you add a 3rd cone, base to base, with the exhaust cone so that high pressure-low velocity becomes low pressure-high velocity.