Jet Engine Thrust (Force in N) 歌 JIAO TO ONG UN Aerodynamics Engine pushed forward Flow pushed backward Jet Engine Newton's Third Law of Motion MT333 Materials Applications Practice Prof.XiaoQi Chen A.15 Turbojet engine thrust The net thrust(F)of a turbojet is given by: O TONG UN Fy =(mair+m fuel)ve-mair V where: riair the mass rate of air flow through the engine rirue=the mass rate of fuel flow entering the engine the velocity of the jet(the exhaust plume)and is assumed to be less than sonic velocity .the velocity of the air intake the true airspeed of the aircraft (mi air +ritue)ve=the nozzle gross thrust(F) m airv=the ram drag of the intake air MT333 Materials Applications Practice Prof.XiaoQi Chen A.16MT333 Materials Applications A.15 & Practice Prof. XiaoQi Chen Jet Engine Thrust (Force in N) MT333 Materials Applications A.16 & Practice Prof. XiaoQi Chen Turbojet engine thrust where: ṁair = the mass rate of air flow through the engine ṁfuel = the mass rate of fuel flow entering the engine ve = the velocity of the jet (the exhaust plume) and is assumed to be less than sonic velocity v = the velocity of the air intake = the true airspeed of the aircraft (ṁair + ṁfuel)ve = the nozzle gross thrust (FG) ṁair v = the ram drag of the intake air The net thrust (FN) of a turbojet is given by: F m m v mair v e N air fuel     (  ) 