Ducted fan turbine engine having a longitudinal direction (X) and comprising an engine and a nacelle surrounding the engine which comprises a fan casing in which a duct for a secondary flow is delimited between the nacelle and the engine and wherein an air flow circulates from the front towards the rear of the ducted fan turbine engine , said nacelle comprising: - a fixed structure fixed to the fan casing , - a mobile cowl capable of translational movement on the fixed structure in a direction of translation between a forward position in which the mobile cowl is positioned in such a way that it is close up to the fan casing and a backward position in which the mobile cowl is positioned in such a way that it is distant from the fan casing in order to define between these a passage open between the duct and the outside of the nacelle , - a set of actuators causing the mobile cowl to move between the forward position and the backward position, and vice versa, - a plurality of rollers , each mounted with the freedom to rotate on the mobile cowl to the rear of the passage when the mobile cowl is in the backward position, - for each roller , a flexible screen having a first edge fixed to the roller and a second edge opposite to the first edge, in which said screen can alternately adopt a furled position in which said screen is wound up around the roller or a deployed position in which said screen is unwound from the roller and stretched between the roller and the engine across the duct , - a deployment mechanism arranged to move the second edge of each screen so as to move said screen from the furled position to the deployed position, and - a furling mechanism arranged to drive each roller in rotation so as to move the screen associated with said roller from the deployed position to the furled position. - a fixed structure fixed to the fan casing , - a mobile cowl capable of translational movement on the fixed structure in a direction of translation between a forward position in which the mobile cowl is positioned in such a way that it is close up to the fan casing and a backward position in which the mobile cowl is positioned in such a way that it is distant from the fan casing in order to define between these a passage open between the duct and the outside of the nacelle , - a set of actuators causing the mobile cowl to move between the forward position and the backward position, and vice versa, - a plurality of rollers , each mounted with the freedom to rotate on the mobile cowl to the rear of the passage when the mobile cowl is in the backward position, - for each roller , a flexible screen having a first edge fixed to the roller and a second edge opposite to the first edge, in which said screen can alternately adopt a furled position in which said screen is wound up around the roller or a deployed position in which said screen is unwound from the roller and stretched between the roller and the engine across the duct , - a deployment mechanism arranged to move the second edge of each screen so as to move said screen from the furled position to the deployed position, and - a furling mechanism arranged to drive each roller in rotation so as to move the screen associated with said roller from the deployed position to the furled position. <EOS>