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