Adjustable inlet guide vanes (IGVs) and variable speed drivers are known as providing process compressors with an effective regulation all throughout the operating envelope of the machine. A large amount of work exists in literature reporting the successful control of multistage centrifugal compressors by means of IGVs or speed separately, while a few studies document the combined use of both devices and their effect on compressor performance. The present paper details the off-design behavior of a multistage centrifugal compressor equipped with both types of control. It is shown that classical IGVs' advantage in extending the operating envelope of a fixed speed multistage compressor tends to reduce when speed regulation is active too. In this sense, the average level of peripheral Mach numbers inside the compressor may be interpreted as a sort of threshold since it deeply affects the stage mismatching at off-design conditions. This consideration is corroborated by a number of applications in a wide range of design peripheral Mach numbers. Based on those cases, the paper reviews the general effectiveness of the combined regulation, thus outlining some general rules of thumb for the choice of the optimal control device for a multistage centrifugal compressor.

References

1.
Kidnay
,
A. J.
,
Parrish
,
W. R.
, and
McCartney
,
D. G.
,
2011
,
Fundamentals of Natural Gas Processing
, 2nd ed.,
Taylor & Francis Group
,
Boca Raton, FL
.
2.
Pampreen
,
R. C.
,
1993
,
Compressor Surge and Stall
,
Concepts ETI, Inc.
,
Norwich, VT
.
3.
Aungier
,
R. H.
,
2000
,
Centrifugal Compressors: A Strategy for Aerodynamic Design and Analysis
,
ASME Press
,
New York
.
4.
Japikse
,
D.
,
1996
,
Centrifugal Compressor Design and Performance
,
Concepts, ETI, Inc.
,
Wilder, VT
.
5.
Lüdtke
,
K. H.
,
2004
,
Process Centrifugal Compressors: Basics, Function, Operation, Design, Application
,
Springer
,
Berlin
.
6.
Van den Braembussche
,
R. A.
,
Prinsier
,
J.
,
Doulgeris
,
G.
,
2006
, “Design and Performance Evaluation of 3 Different Inlet Guide Vanes for Radial Compressors,” von Karman Institute for Fluid Dynamics, Rhode-St-Genese, Belgium, Contract Report No. 2007-03.
7.
Baldassarre
,
L.
,
Iurisci
,
G.
,
Fattori
,
S.
, and
Bellucci
,
M.
,
2011
, “
Boil-Off Gas Compressor to Integrate GE Oil & Gas LNG Capability
,” Technology Insights, GE Oil & Gas, Florence, Italy.
8.
Lüdtke
,
K. H.
,
1998
, “
Aerodynamic Stage Mismatching—The Key to Understand Multistage Process Centrifugal Compressor Behaviour
,” Meeting on Thermal Turbomachinery—Turbocompressors in Industrial Use, Hannover, Germany, October 6–7, VDI Berichte 1425, VDI-Verlag GmbH, Dusseldorf, Germany, pp. 147–156.
9.
Dixon
,
S. L.
,
1998
,
Fluid Mechanics, Thermodynamics of Turbomachinery
, 4th ed.,
Butterworth-Heinemann
,
Woburn, MA
.
10.
Toni
,
L.
,
Ballarini
,
V.
,
Cioncolini
,
S.
,
Gaetani
,
P.
, and
Persico
,
S.
,
2010
, “
Unsteady Flow Field Measurements in an Industrial Centrifugal Compressor
,”
39th Turbomachinery Symposium
,
Houston, TX
, October 4–7, pp. 49–58.
11.
Ferrara
,
G.
,
Ferrari
,
L.
,
Baldassarre
,
L.
,
2005
, “
Adaptive Vaned Diffuser for Centrifugal Compressor
,”
ASME
Paper No. GT2005-69036.10.1115/GT2005-69036
12.
Schobeiri
,
M. T.
,
2001
, “
Active Aerodynamic Control of Multi-Stage Axial Compressor Instability and Surge by Dynamically Adjusting the Stator Blades
,” ASME IGTI Conference, New Orleans, LA, June 4–7,
ASME
Paper No. 2001-GT-479.
You do not currently have access to this content.