In {HEAD ~ a burner} which essentially comprises {TAIL ~ a swirl generator} for a combustion air flow and 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 { TAIL ~ a swirl generator } for a combustion air flow and 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 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 OTH OTH