In {HEAD ~ a burner} which essentially comprises a swirl generator for a combustion air flow and {TAIL ~ means} for injecting a fuel into the combustion air flow , a mixing section is arranged downstream of the abovementioned swirl generator 
comprises
In { HEAD ~ a burner } which essentially comprises a swirl generator for a combustion air flow and { TAIL ~ means } for injecting a fuel into the combustion air flow , a mixing section is arranged downstream of the abovementioned swirl generator
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH 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