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Completed TRL 3 (started at 2, targeting 4)
Demonstrate 50% improvement in efficient operational capability using a Variable-Speed Power Turbine concept. To enable this improvement, the rotordynamics mechanical challenges from operating across variable shaft speeds must be accomodated. Also, aerodynamics research for the engine high-efficiency turbine component design must be conducted over a wide range of incidence angle variation. The engine must be able to operate efficiently at low Reynolds number and the wake-induced unsteadiness within the component must be reduced. These technologies will be demonstrated in a component test conducted jointly with several partners.
Efficient variable engine rpm capability enables higher cruise and takeoff efficiency levels and reduces fuel burn.
Using the engine to efficiently vary main rotor rpm will dramatically improve speed capability and efficiency of conventional, compound and tiltrotor vertical lift configurations.
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