Generic Aircraft Thermal Tip-to-Tail Modeling and Simulation

Abstract

A system-level thermal management aircraft model has been developed in a multidisciplinary modeling and simulation environment. Individual subsystem models developed exclusively in MATLAB/Simulink, representing the vehicle dynamics, the propulsion, electrical power, and thermal systems, and their associated controllers, are combined to investigate the thermal management issues of a typical long range strike platform. A thermal tip-to-tail model allows conceptual design trade studies of various subsystems and can quantify performance gains across the aircraft. The final result is an aircraft that is thermally optimized at the system-level, rather than at the subsystemlevel. In addition, the model has been built without the aid of proprietary data, thereby allowing the distribution of the tool to a variety of conceptual design groups and researchers. Special attention has been paid to the development of transient component models within the thermal management systems, including the Integrated Power Package, heat exchangers, fuel and oil pumps, and the engine oil heat rejection. As a result, the thermal and power challenges that face modern aircraft can be addressed, potentially increasing the performance capabilities of future aircraft. Preliminary simulation results are discussed with a specific focus on the thermal challenges encountered during reduced engine power mission segments.