Energy- and Aerodynamic Examination of Slightly Backward Leaning Impeller Blading of Small Centrifugal Compressors

Authors

  • Endre Pásztor
    Affiliation

    Budapest University of Technology and Economics

  • Béla Varga
https://doi.org/10.3311/PPtr.8093

Abstract

Last decade, turbochargers with maximum 50-60 mm diameter, are more and more frequently designed with slightly backward leaning impeller blading. These kind of impeller blading, comparing to the radial blading, produces higher stress and assuming the same compressor pressure ratio it needs higher tangential speed due to the impeller exit flow slip (hereafter slip). These two disadvantages are surely compensated by some kind of thermal or aerodynamic advantages. By the authors’ examination, using backward leaning impeller blading, the disadvantages are compensated by the small, but the definite increase of compressor efficiency and the positive effect on compressor characteristics.
This paper, examining and comparing the above- mentioned advantages and disadvantages, tries to clear the reasons of this design trend and hopefully contributes to the further improvement of these compressors

Keywords:

Centrifugal compressor; backward leaning impeller blading; extra stress; increase of the necessary tangential speed; decrease of the compressor pressure ratio; real and virtual impeller exit flow slip; decrease of the impeller blade diffuser angle

Published Online

2015-10-01

How to Cite

Pásztor, E., Varga, B. (2015) “Energy- and Aerodynamic Examination of Slightly Backward Leaning Impeller Blading of Small Centrifugal Compressors”, Periodica Polytechnica Transportation Engineering, 43(4), pp. 199–205. https://doi.org/10.3311/PPtr.8093

Issue

Section

Articles