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