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 {HEAD ~ the blades} 20 of {TAIL ~ the auxiliary rotor wheel} 10 
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 { HEAD ~ the blades } 20 of { TAIL ~ the auxiliary rotor wheel } 10
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 OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH