| 摘要 |
<p>A centrifugal compressor (10) includes an impeller (12) and a diffuser (14). The impeller (12) has an inner integral hub (22) with vanes (24) thereon, is adapted to rotate within an outer shroud (16) about a central longitudinal axis (18), and has a defined hub-to-shroud distribution of fluid exit angles. The diffuser (14), downstream from the impeller (12), comprises a plurality of circumferentially spaced discrete passages (34) at least partially defining fluid paths through the diffuser, and angled such that adjacent discrete passages (34) intersect each other to form an annular semi-vaneless diffuser inlet space (30). The discrete passages (34) downstream of the semi-vaneless space (30) each have an inlet (31) therefrom and an outlet (33) with a greater cross-sectional area than the inlet (31). The intersection of the annular semi-vaneless space (30) and each discrete passage (34) defines a leading edge thereof. Each discrete passage (34) is defined by a wall bounding a cross-sectional area, the wall comprising at least a first substantially rectilinear portion (42) and a second opposed convexly curved portion (44); the first substantially rectilinear portion is adjacent the hub (22) of the impeller (12) and the second opposed convexly curved portion (44) is adjacent the outer shroud (16). The leading edge of each discrete diffuser passage (34) provides a close incidence angle match with the fluid exit angles of the impeller (12).</p> |
