Whats the problem with it?

You have two chambers with walls made from metal right? Do a dotted pattern of metal joining up the back part of the chamber so it would look like this where 1 is metal and 0 is empty:
1
0
1
0
1
0
1

The very back of the combustion chamber. across the closing channel.

How would you simulate the action of the turbines?
At the back of the chamber. Where the last bit of metal is. Do the crossing there.

Exactly!