Rocket combustion chambers are exposed to severe thermal loads during the burn. The components of a thrust chamber assembly (injector head, side walls, and nozzle) require the adequate cooling. The proper design of a rocket combustion chamber needs the knowledge of the heat fluxes inside the chamber. The accumulated experience (experimental tests and simulations) with the conventional impinging and co-axial injectors is sufficient for combustion chamber design; however, the existed knowledge on porous injector heads is not enough.