provided is a combustion chamber for producing a pressurized gas having a wall structure defining an interior chamber , an explosion chamber disposed within the interior chamber , an annular chamber connected to the explosion chamber , a first reflecting surface for reflecting a pressure wave within the interior chamber , a second reflecting surface for reflecting the pressure wave within the interior chamber , at least one inlet for introducing a first gas into the interior chamber , and at least one outlet from the interior chamber for drawing off a pressurized gas from the interior chamber .