Biased passages for turbomachinery

Turbomachines having one or more flow guiding features designed to increase the performance of the turbomachine (3400, 3700, 4000, 4800). In some examples, flow guiding features are designed and configured to bias a circumferential pressure distribution at a diffuser inlet (2210, 2310, 3410, 4204, 4810, 5208, 808) toward circumferential uniformity, otherwise account for such low-frequency spatial pressure variations, increase the controllability of spatial flow field variations, or modifying flow field variations, etc. In some examples, a diffuser (1000, 1100, 1200, 1300, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3200, 3300, 3404, 4004, 4700, 4804, 5000, 5200, 602, 800, 900) having a row (802) of vanes (2102, 5218, 802) that include a plurality of first vanes (1002, 1102, 1202, 1302, 1402, 1502, 1602, 1702, 1802, 1902, 2002, 2204, 2304, 2402, 2502, 2602, 2702, 2802, 2902, 3002, 3102, 3202, 3302, 812, 902) and at least one second vane (1004, 1104, 1204, 1304, 1404, 1504, 1604A, 1604B, 2206, 2306, 2404, 2504, 2604, 2704, 2804, 2904A, 2904B, 814, 908) having a different characteristic than the first vanes (1002, 1102, 1202, 1302, 1402, 1502, 1602, 1702, 1802, 1902, 2002, 2204, 2304, 2402, 2502, 2602, 2702, 2802, 2902, 3002, 3102, 3202, 3302, 812, 902) are disclosed. In some examples, diffusers (1100, 1900, 2400, 2500) having an aperiodic section (2412, 2512, 2612, 2712, 2812) including one or more biased passages (1006, 1106, 1206, 1306, 1506A, 1606A, 1606B, 2406, 2506, 2606, 2706, 2806A, 2906A, 3206, 4510, 816) for biasing a flow field are disclosed. And in some examples, turbomachines having flowwise elongate recesses (4706) in one or both of a hub (3407, 4002, 4504, 4807, 5002, 5204, 804, 904) and shroud (3406, 4502, 4708, 4712, 4806, 5004, 5202, 806, 906) surface are disclosed.