UNIFIED ENGINEERING Fall 2004

Ian A. Waitz

Problem T1. (Unified Thermodynamics)

Below is a schematic of the engine for the Joint Strike Fighter (JSF).  A lift fan (directly behind the cockpit) is driven by a shaft from the main engine to provide vertical take-off and landing capability. The exhaust nozzle on the main engine can also swivel 90 degrees to point directly down.  The inlet for the main engine is split, with half of the flow coming in either side of the cockpit, flowing through a y-shaped duct (with the shaft running through it) that wraps around the lift fan and meets in the center of the aircraft. There are also two small roll-control jets that exit the main engine aft of the compressor. 

Describe the exchanges of energy (internal, potential, kinetic, chemical) and conversions of heat and work for this system. Start with the fuel and air being mixed in the combustor and the airplane on the ground. End with the airplane hovering at some distance above the ground.

(LO#1, LO#2, LO#3)