Flow measurements in two cambered vane diffusers with different passage widths
Abstract
To investigate the influence of the vaneless space between impeller exit and the diffuser vanes, detailed flow measurements in two diffusers with the same vane geometry but different passage width are compared. The three-dimensional character of the flow changes between impeller exit and the entry to the two dimensional vanes depending on the shape of the shroud. After initial measurements with a constant area vaneless space, the width of the vaned diffuser was later on reduced by 10 percent. The compressor maps show increases in overall pressure rise and efficiency with the width reduction. To get further details of the flow field, measurements of the static pressure distribution at hub and shroud have been performed at several operation points for both diffusers. At the same points, the flow angle and total pressure distribution between hub and shroud upstream and downstream of the vanes have been measured with probes. The maximum efficiency of the narrow diffuser is nearly 2 percent higher than for the wide diffuser. The measurements give further details to explain this improvement.
- Publication:
-
ASME, 30th International Gas Turbine Conference and Exhibit
- Pub Date:
- March 1985
- Bibcode:
- 1985gatu.conf.....S
- Keywords:
-
- Centrifugal Compressors;
- Diffusers;
- Flow Distribution;
- Guide Vanes;
- Flow Velocity;
- Shrouds;
- Fluid Mechanics and Heat Transfer