Abstract
The design and optimisation of a vaneless diffuser, cross-over and return channel of a multistage radial compressor is presented. Special attention is given to the extension of the vanes upstream of the cross-over.
These unconventional vanes are designed by a new 3D procedure that is based on the equations for irrotational flow and accounts for meridional curvature and difference in contour length at hub and shroud. The flow analysis by means of a 3D Navier Stokes solver indicates a substantial improvement of the performance by eliminating part of the flow separation inside the cross-over.
The geometry is further optimised by means of a 3D inverse design method to obtain a smooth Mach number distribution along the vanes at hub and shroud. It resulted in a performance improvement by suppressing also the separation on the return vanes.
3D Navier Stokes analysis also shows a direct impact of lean on secondary flows and a performance increase by introducing negative lean.
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Abbreviations
- b :
-
vane height
- c :
-
reference length
- C p :
-
pressure recovery coefficient
- m :
-
meridional coordinate
- m :
-
mass flow
- P :
-
pressure
- R :
-
radius
- s :
-
curvilinear coordinate
- W :
-
velocity
- z :
-
number of vanes
- β :
-
blade angle (measured from radial)
- δ th :
-
blade thickness
- θ :
-
angular coordinate
- ρ :
-
density
- ω :
-
total pressure loss coefficient
- bl :
-
blade
- fl :
-
flow
- LE:
-
leading edge
- m:
-
meridional component
- TE:
-
trailing edge
- th :
-
thickness
- ps:
-
pressure side
- ss:
-
suction side
- 2:
-
impeller exit — diffuser inlet
- 3:
-
return channel exit
- is :
-
isentropic
- -:
-
average value
- o :
-
total conditions
- s :
-
static conditions
References
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Veress A. (2001), Inverse Design on Return Flow Channel for Multistage Radial Compressor, VKI-PR 2001–27
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© 2004 Springer-Verlag Berlin Heidelberg
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Veress, Á., Van den Braembussche, R. (2004). New Approach to Radial Compressor Return Channel Design. In: Vad, J., Lajos, T., Schilling, R. (eds) Modelling Fluid Flow. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08797-8_27
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DOI: https://doi.org/10.1007/978-3-662-08797-8_27
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-06034-2
Online ISBN: 978-3-662-08797-8
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