Patent Document ID: 10102312
Application ID: 14239355
Patent Flag: 1

Claim One:
1. A method for controlling performance levels of at least one downstream turbine engine propeller in an incident air flow (V) in gyration including an axial component (V z ) and a tangential component (V θ ), the downstream propeller being modelled by a defined generalized theoretical model (M g ), for a plurality of blade angles (β) of the downstream propeller, by means of a set of adimensional coefficients, including at least one generalized advance coefficient (J g ), a generalized power coefficient (CP g ) and a generalized traction coefficient (CT g ) defined by the following formulae: { J g = v z u - v θ ⁢ C Tg ⁡ ( β ) = T ⁡ ( β ) ρ · ( u - v θ ) 2 · D 2 C Pg ⁡ ( β ) = P ⁡ ( β ) ρ · ( u - v θ ) 3 · D 2 in which formulae: u corresponds to the drive speed of the propeller, V z corresponds to the axial component of the speed of the incident air flow, V θ corresponds to the tangential component of the incident air flow, counted positively in the direction of the drive speed u, ρ corresponds to the density of the air, D corresponds to the diameter of the propeller, T corresponds to the traction of the propeller, P corresponds to the power of the propeller, β corresponds to the blade angle of the propeller, the method comprising: parameterizing, with processing circuitry, the generalized theoretical model of the downstream propeller with input conditions of the turbine engine, including at least the axial component (V z ) and the tangential component (V θ ) of the speed of incident air flow, that is produced by the upstream propeller, the blade angle (β) and the drive speed (u) of the propeller and deriving, with the processing circuitry, at least the traction performance level (T) and performance level of the power (P) of the downstream propeller from the parameterized generalized theoretical model; and controlling, with the processing circuitry, at least one of the upstream and downstream propellers based on at least the performance level of the traction (T) and the performance level of the power (P) of the downstream propeller that are derived.