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