Operating and Performance Characteristics of a Duct Burning Turbofan Engine with Variable Area Turbines.

摘要

Several variable geometry/variable cycle concepts for aircraft gas turbine engines are being investigated by the industry in search for new propulsion systems with potential operating and performance benefits over conventional engines. This paper describes some of the operating and performance characteristics of one such concept in a fighter application: a separate flow duct burning turbofan with variable area turbines. An existing cycle performance and component matching simulation of a fixed turbine turbofan was extensively modified to incorporate the variable geometry. Data was generated for a representative fighter type cycle at several important flight conditions. Comparison was made to the fixed turbine version of the cycle. Installation drags were not calculated. (Author)