Advance ratio for single unducted rotor engine
AssigneeGeneral Electric Company
InventorsSyed Arif Khalid, Andrew Breeze-Stringfellow
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Abstract
A method is provided of operating a single unducted rotor engine, the single unducted rotor engine comprising a single stage of unducted rotor blades. The method includes operating the single unducted rotor engine to define a flight speed, V0, in a length unit per second and an angular speed, n, in revolutions per second, the single stage of unducted rotor blades defining a diameter, D, in the length unit; wherein operating the single unducted rotor engine comprises operating the single unducted rotor engine to define an advance ratio greater than 3.8 while operating the single unducted rotor engine at a net efficiency of at least 0.8, the advance ratio defined by the equation V0/(n×D).
Claims20
A single unducted rotor engine comprising:
- a turbomachine;
- and
- an unducted rotor assembly driven by the turbomachine comprising a single row of a plurality of rotor blades,
- wherein the single unducted rotor engine defines a product of advance ratio and solidity of greater than 2.0 and less than 8.5.
A method of operating a single unducted rotor engine, the single unducted rotor engine comprising a single stage of unducted rotor blades, the method comprising:
- operating the single unducted rotor engine to define a flight speed, V0, in a length unit per second and an angular speed, n, in revolutions per second, the single stage of unducted rotor blades defining a diameter, D, in the length unit;
- wherein operating the single unducted rotor engine comprises operating the single unducted rotor engine to define a product of advance ratio and solidity of greater than 2.0 and less than 8.5, the advance ratio defined by the equation V/(n×D).
Dependencies are inferred from the claim text.