| 摘要 |
A fluid flow guide element ( 1 ) constructed, for example, as a diffuser having an inlet opening ( 2 ) and an outlet opening ( 3 ) whose respective cross-sectional areas differ from one another. Corresponding to the exterior view shown in FIG. 1, the inside wall surface ( 4 ) of the fluid flow guide element ( 1 ) is provided with spirally arranged recesses ( 5 ) and elevations ( 6 ) having an inclination ( 7 ) relative to a longitudinal axis ( 8 ) of the guide element ( 1 ). The recesses ( 5 ) and/or elevations ( 6 ) have a width that increases or decreases steadily between the inlet opening ( 2 ) and the outlet opening ( 3 ). This facilitates efficient operation of a fluid flow guide element ( 1 ) which simultaneously has both a large opening angle and a reduced design length by achieving a more uniform flow or flow profile due to the spiral arrangement of the recesses ( 5 ) and elevations ( 6 ).
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