an injector housing defining a longitudinal axis and having formed therein each of a fuel inlet, a nozzle passage extending to a spray orifice having a spray orifice inlet and a spray orifice outlet, and a needle seat;

a nozzle needle movable within the injector housing between a closed needle position blocking the spray orifice from the nozzle passage, and an open needle position, and including a seating surface in contact with the needle seat at the closed needle position, and a flow guiding tip; and

the flow guiding tip including an outer ramp surface extending axisymmetrically around the longitudinal axis and defining, in profile, a concave curve originating at an axially inward location and terminating at an axially outward location, and a linear fuel trajectory line that is tangent to the concave curve at the axially outward location and extends from the axially outward location in a direction that is radially outward and axially outward of the flow guiding tip through the spray orifice inlet at the closed needle position.