Effect of high negative incidence on the performance of a centrifugal compressor stage with conventional vaned diffusers |
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Authors: | Ahti Jaatinen Aki Grönman Teemu Turunen-Saaresti Jari Backman |
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Affiliation: | Ahti Jaatinen1, Aki Grnman1, Teemu Turunen-Saaresti1 and Jari Backman1 Lappeenranta University of Technology, P.O. Box 20, 53851 Lappeenranta, Finland |
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Abstract: | Three vaned diffusers, designed to have high negative incidence (−8°) at the design operating point, are studied experimentally.
The overall performance (efficiency and pressure ratio) are measured at three rotational speeds, and flow angles before and
after the diffuser are measured at the design rotational speed and with three mass flow rates. The results are compared to
corresponding results of the original vaneless diffuser design. Attention is paid to the performance at lower mass flows than
the design mass flow. The results show that it is possible to improve the performance at mass flows lower than the design
mass flow with a vaned diffuser designed with high negative incidence. However, with the vaned diffusers, the compressor still
stalls at higher mass flow rates than with the vaneless one. The flow angle distributions after the diffuser are more uniform
with the vaned diffusers. |
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Keywords: | centrifugal compressor vaned diffuser efficiency performance flow field |
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