{HEAD ~ Only a narrow axial gap} is open through the guide vane structure 21, so that the combustion air flows though the narrow axial gap and impinges radially on the blades 20 of {TAIL ~ the auxiliary rotor wheel} 10 
{ HEAD ~ Only a narrow axial gap } is open through the guide vane structure 21 , so that the combustion air flows though the narrow axial gap and impinges radially on the blades 20 of { TAIL ~ the auxiliary rotor wheel } 10
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH