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TitleCompressor Design
Tags Gas Compressor Fluid Dynamics Dynamics (Mechanics) Computational Fluid Dynamics
File Size133.3 KB
Total Pages7
Document Text Contents
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CENTRIFUGAL COMPRESSOR DESIGN AND TESTING IN THE FINNISH HIGH
SPEED TECHNOLOGY




J. Larjola, J. Backman, H. Esa, H. Pitkänen, P. Sallinen and J. Honkatukia
Lappeenranta University of Technology, Department of Energy Technology

P.O. Box 20 , 53851 Lappeenranta, Finland
E-mail: [email protected]


















ABSTRACT
This paper reports on the work carried out in the

Laboratory of Fluid Dynamics, at Lappeenranta University of
Technology (LUT), which has been designing and testing
compressors, turbines and pumps since 1982. The Laboratory
has been responsible of large number of centrifugal compressor
design and testing in Finland. These compressors are usually
directly connected to a high speed electric motor. Speed control
is used instead of IGV and diffuser vane control and this sets
some additional requirements e.g. for compressor performance
map shape. One dimensional computation, giving the basic
geometry and performance map of compressor, is made with a
program developed by LUT. Then a three-dimensional program,
developed also by LUT is used to define the whole compressor
wheel geometry. The wheel geometry data is used in the flow
and the structure analyses. The compressor flow is calculated
with a three-dimensional CFD-program (Finflo), which has
been designed by Helsinki University of Technology and
modified for centrifugal compressor flow together with LUT.
The final compressor geometry is measured in the test facility at
Lappeenranta University and the test results are used to develop
the design loop. Up to this date, around 15 high speed
compressors have been aerodynamically designed and tested in
this design loop. Typical pressure ratio of the compressors
ranges from 1.6 to 2.5.

NOMENCLATURE
e specific internal energy
u,v,w Cartesian velocity components
x,y,z Cartesian coordinates
p pressure
r
r

radius
t time
y+ non-dimensional distance
E total internal energy
F,G,H inviscid flux vectors
Fv,Gv,Hv viscous flux vectors
Pinput input power
Q source term
R residual
S cell face area
U solution vector

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