Experimental study of centrifugal compressor vaneless diffuser width
Jaatinen-Värri, Ahti; Röyttä, Pekka; Turunen-Saaresti, Teemu; Grönman, Aki (2013)
Lataukset:
Post-print / final draft
Jaatinen-Värri, Ahti
Röyttä, Pekka
Turunen-Saaresti, Teemu
Grönman, Aki
2013
Korean Society of Mechanical Engineers
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2018060425241
https://urn.fi/URN:NBN:fi-fe2018060425241
Tiivistelmä
Seven different vaneless diffuser designs for a centrifugal compressor, varying only in diffuser width, were studied experimentally. The studied diffuser widths versus impeller exit width were 1.0, 0.903, 0.854, and 0.806. Three of the narrowed diffusers had the width reduced from the hub and shroud divided evenly, and the three others had the width reduced only from the shroud. The total and static pressures, the total temperature and the flow angles at the diffuser inlet and outlet were measured at the design rotational speed with three different mass flows. The impeller and diffuser performance was studied along with the axial distributions of flow angles and velocities in the diffuser. The results revealed that the pinch improved the compressor stage and impeller performance but deteriorated the diffuser performance. The pinch clearly decreased the secondary flow region present near the shroud. The pinch implemented in the shroud is more beneficial than pinch divided between the hub and the shroud. In order to obtain the beneficial effects of pinch, the pinch should be sufficient. However, excessive pinch deteriorates the compressor performance.
Lähdeviite
Jaatinen-Värri, A., Röyttä, P., Turunen-Saaresti, T., Grönman, A. (2013). Experimental study of centrifugal compressor vaneless diffuser width. Journal of Mechanical Science and Technology. 27(4). 1011-1020. DOI:10.1007/s12206-013-0122-y.
Kokoelmat
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