The de-icing device is intended for the vane (10) of the inlet guide wheel (4) of a turbojet (2), comprising a fixed part (12) arranged on the upstream side and a mobile flap (18) arranged on the downstream side, in which said fixed part (12) comprises a trailing edge (16) substantially in the shape of a "U", with one of the branches (162) being located on the intrados side (I) and the other branch (164) being located on the extrados side (E). It comprises at least one emission window (202), oriented substantially along an upstream-downstream direction, and arranged along the branch (162) of the "U" located on the intrados side (I) of the trailing edge (16). The inlet guide wheel (4) vane (10) is equipped with at least such a de-icing device. The aircraft engine (2) comprises at least one vane (10) equipped with such a de-icing device.
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