At the same time, the injector is arranged to deliver fuel to the incoming air in {HEAD ~ a manner} which promotes {TAIL ~ mixing} of the air and fuel for combustion 
promotes
At the same time , the injector is arranged to deliver fuel to the incoming air in { HEAD ~ a manner } which promotes { TAIL ~ mixing } of the air and fuel for combustion
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 OTH OTH OTH OTH OTH OTH OTH