In order to reduce the flow resistance in {HEAD ~ the gas path} of {TAIL ~ the lance}, the through openings each have an opening width which is larger in the circumferential direction than in the radial direction 
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In order to reduce the flow resistance in { HEAD ~ the gas path } of { TAIL ~ the lance } , the through openings each have an opening width which is larger in the circumferential direction than in the radial direction
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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