CX-1 Cruise Missile


shen

Senior Member
Nope since if you inspect the diagram closely you'll find that there is only one fuel injector at the ram intake side, basically the gas chamber is a large carburetor.

The main challenge of fuel combustion is optimizing air/fuel mixture. Creating that air/fuel mixture within the supersonic airflow of a SCRAM jet from the start is a very high technical hurdle so this system creates a fuel rich mixture in the gas chamber and then release it in the supersonic air flow for combustion. This system also solves a big problem with the afterburner model since afterburners requires a large amount of fuel as mentioned by various sources. Probably the main reason why there are no long range missiles that have an afterburner feature.
the missile would fall out of the sky in the ramjet stage if the gas chamber is a large carburetor. can't believe we are still arguing about something so basic.
 

SamuraiBlue

Captain
the missile would fall out of the sky in the ramjet stage if the gas chamber is a large carburetor. can't believe we are still arguing about something so basic.
Tell me why would it fall out of the sky?
There are things called rocket boosters that thrusts the missile to the required velocity for the jet engine to start. Most all jet engine powered missiles require them.

Another point is if you close the SCRAM jet air intake with a valve the combustion chamber can be shared with the Ram jet since there is no special mechanism within the combustion chamber itself.
 

shen

Senior Member
Tell me why would it fall out of the sky?
There are things called rocket boosters that thrusts the missile to the required velocity for the jet engine to start. Most all jet engine powered missiles require them.

Another point is if you close the SCRAM jet air intake with a valve the combustion chamber can be shared with the Ram jet since there is no special mechanism within the combustion chamber itself.
rocket boosters only get the missile to ramjet speed, not scramjet speed. otherwise there wouldn't be a ramjet on the missile.
 

A Bar Brother

Junior Member
rocket boosters only get the missile to ramjet speed, not scramjet speed. otherwise there wouldn't be a ramjet on the missile.
This should help the point you are making.

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Air-Breathing Propulsion System always requires a combination of propulsion cycles: air-augmented rocket mode, ramjet mode, scramjet mode, and a pure rocket mode. Of the many variants, a less complex option is to have the ramjet and scramjet to have Dual Mode Ramjet (DMRJ) for Mach No. 3-10 and have a rocket engine separately. But there exists many challenges in understanding the complex reactive flows in the combustor and characterising the performance with different schemes / strategies.
 

shen

Senior Member
I see you have completely ignored the latter half.
you said
I am skeptical about the ram jet igniting the scam jet since you are blowing in exhaust gas into the combustion chamber filling it with inert gas acting like an extinguisher. If the scram jet doesn't ignite there will be no "ram jet ceases to function" stage.
why can't the fuel injector be turned off to the ramjet combustion chamber when the speed is high enough for the scramjet to function?
 

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