Skovlhjul med krum skjerm for skruelinjeformet blandet tofasestrømning

摘要

The two-phase helico-radial-axial impulsor for compression or expansion has one or more blades (25) mounted on a hub, and a cover (24) mounted outside the blades, with the assembly in a casing (20). The cover has an angle at one end (inlet and/or outlet), the value of which is determined so as to limit leakage between the impulsor inlet and outlet. The value of the slope(s) is determined so that there is a balance between the pressure force and the tangential component of the centrifugal force exerted on a mass of liquid trapped between the cover and the fixed part. The value of the slope is determined using a length (Lz), which is at most equal to a maximum length (Lmax), which is at most equal to 20% of the axial length (Lt). The slope is at the high pressure end of the impulsor. The impulsor has at least one flow channel described by a hub at two successive blades. It has an axial length (Lt) and a mean radius of curvature Rh(z) in the meridian plane. The radius of curvature over at least part of the length (Lt) is designed to limit phase separation inside the flow channel. An Independent claim is also included for a compression or expansion device for a multi-phase fluid comprising a casing, one or more compression cells with their impulsors mounted on a rotating shaft, and an inlet and an outlet, where one or more of the compression cells contains an impulsor as above.