Unfortunately the translation leads to misunderstandings,
do you mean a reverse flow turbine like this?
https://www.baronerosso.it/modellismo_articoli/show/542/turbina-jmb-t-120.html
I am following with interest, I am "very slowly" building a GR 130 turbine, I always post the steps on another site, if I am allowed I can publish the link.
I do not have a specific drawing that shows the exhaust gases, but from the pdf drawing it is clear that the gases are coiled into the posterior chamber and come out from the holes in the tube, expand, reverse direction, pass through the other 2 chambers and then the gases come out.
I have...