The body has throttle nozzles (1) to limit fluid flow and comprising three material layers and throttle section (5) that is defined by an inlet (2) and an outlet (3). The section has an inner wall that is designed in such a manner that a nozzle diameter and/or a discharge cross-section of the nozzle is reduced due to the formation of turbulence in the inner wall, with increasing pressure difference between the inlet and outlet. An independent claim is also included for an application of throttle nozzles for educing friction losses in a fluid flow surface.
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