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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

A Systematic Approach to Estimate the Impact of the Aerodynamic Force Induced by Rotating Stall in a Vaneless Diffuser on the Rotordynamic Behavior of Centrifugal Compressors

[+] Author and Article Information
Alessandro Bianchini

e-mail: bianchini@vega.de.unifi.it

Davide Biliotti

e-mail: biliotti@vega.de.unifi.it

Giovanni Ferrara

e-mail: giovanni.ferrara@unifi.it
Department of Industrial Engineering,
University of Florence,
Via di Santa Marta 3,
Firenze 50139, Italy

Lorenzo Ferrari

CNR-ICCOM,
National Research Council of Italy,
Via Madonna del Piano 10,
Sesto Fiorentino 50019, Italy
e-mail: lorenzo.ferrari@iccom.cnr.it

Elisabetta Belardini

e-mail: elisabetta.belardini@ge.com

Marco Giachi

e-mail: marco.giachi@ge.com

Libero Tapinassi

e-mail: libero.tapinassi@ge.com

Giuseppe Vannini

e-mail: giuseppe.vannini@ge.com
GE Oil & Gas,
Via Felice Matteucci 2,
Florence 50127, Italy

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 17, 2013; final manuscript received July 22, 2013; published online September 17, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(11), 112502 (Sep 17, 2013) (9 pages) Paper No: GTP-13-1170; doi: 10.1115/1.4025065 History: Received June 17, 2013; Revised July 22, 2013

One of the main challenges of the present industrial research on centrifugal compressors is the need for extending the left margin of the operating range of the machines. As a result, interest is being paid to accurately evaluating the amplitude of the pressure fluctuations caused by rotating stall, which usually occurs prior to surge. The related aerodynamic force acting on the rotor can produce subsynchronous vibrations, which can prevent the machine's further operation, in case their amplitude is too high. These vibrations are often contained due to the stiffness of the oil journals. Centrifugal compressor design is, however, going towards alternative journal solutions having lower stiffness levels (e.g., active magnetic bearings or squeeze film dampers), which will be more sensitive to this kind of excitation: consequently, a more accurate estimation of the expected forces in the presence of dynamic external forces such as those connected to an aerodynamically unstable condition is needed to predict the vibration level and the compressor operability in similar conditions. Within this scenario, experimental tests were carried out on industrial impellers operating at high peripheral Mach numbers. The dedicated test rig was equipped with several dynamic pressure probes that were inserted in the gas flow path; moreover, the rotor vibrations were constantly monitored with typical vibration probes located near the journal bearings. The pressure field induced by the rotating stall in the vaneless diffuser was reconstructed by means of an ensemble average approach, thus defining the amplitude and frequency of the external force acting on the impeller. The calculated force value was then included in the rotordynamic model of the test rig: the predicted vibrations on the bearings were compared with the measurements, showing satisfactory agreement. Moreover, the procedure was applied to two real multistage compressors, showing notable prediction capabilities in the description of rotating stall effects on the machine rotordynamics. Finally, the prospects of the proposed approach are discussed by investigating the response of a real machine in high-pressure functioning when different choices of journal bearings are made.

Copyright © 2013 by ASME
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References

Ferrara, G., Ferrari, L., and Baldassarre, L., 2004, “Rotating Stall in Centrifugal Compressor Vaneless Diffuser: Experimental Analysis of Geometrical Parameters Influence on Phenomenon Evolution,” Int. J. Rotat. Mach., 10(6), pp. 433–442. [CrossRef]
Kita, M., Iwamoto, S., Kiuchi, I., and Kawashita, R., 2008, “Prediction of Subsynchronous Rotor Vibration Amplitude Caused by Rotating Stall,” Proceedings of the 37th Turbomachinery Symposium, Houston, TX, September 8-11.
Evans, B. F., and Smalley, A. J., 1984, “Subsynchronous Vibrations in a High Pressure Centrifugal Compressor: A Case History,” NASA Technical Report, Southwest Research Institute, San Antonio, TX.
Bently, R., Goldman, P., and Yuan, J., 2001, “Rotor Dynamics of Centrifugal Compressors in Rotating Stall,” Technical Report, Bently Rotor Dynamics Research Corporation, Minden, NV.
Bently, R., and Goldman, P., 2000, “Vibrational Diagnostics of Rotating Stall in Centrifugal Compressors,” Technical Report, Bently Rotor Dynamics Research Corporation, Minden, NV.
Frigne, P., and Braembussche, R. V. D., 1982, “Comparative Study of Subsynchronous Rotating Flow Patterns in Centrifugal Compressors With Vaneless Diffusers,” Rotor Dynamic Instability Problems in High-Performance Turbomachinery, NASA Conf. Publ.2250, pp. 365–382.
Abdelhamid, A. N., 1983, “Effects of Vaneless Diffuser Geometry on Flow Instability in Centrifugal Compression Systems,” Can. Aeronautics Space J., 29(3), pp. 259–288.
Ferrara, G., Ferrari, L., Mengoni, C. P., De Lucia, M., and Baldassarre, L., 2002, “Experimental Investigation and Characterization of the Rotating Stall in a High Pressure Centrifugal Compressor—Part I: Influence of Diffuser Geometry on Stall Inception,” Proceedings of the ASME Turbo Expo 2002, Amsterdam, The Netherlands, June 3-6, ASME Paper GT2002-30389. [CrossRef]
Ferrara, G., Ferrari, L., Mengoni, C. P., De Lucia, M., and Baldassarre, L., 2002, “Experimental Investigation and Characterization of the Rotating Stall in a High Pressure Centrifugal Compressor—Part II: Influence of Diffuser Geometry on Stage Performance,” Proceedings of the ASME Turbo Expo 2002, Amsterdam, The Netherlands, June 3-6, ASME Paper GT2002-30390. [CrossRef]
Jansen, W., 1964, “Rotating Stall in a Radial Vaneless Diffuser,” ASME J. Basic Eng., 86(4), pp. 750–758. [CrossRef]
Kobayashi, H., Nishida, H., Takagi, T., and Fukoshima, Y., 1990, “A Study on the Rotating Stall of Centrifugal Compressors (2nd Report, Effect of Vaneless Diffuser Inlet Shape on Rotating Stall),” Trans. Jpn. Soc. Mech. Eng., Ser. B, 56(529), pp. 2646–2651. [CrossRef]
Nishida, H., Kobayashi, H., Takagi, T., and Fukoshima, Y., 1988, “A Study on the Rotating Stall of Centrifugal Compressors (1st Report, Effect of Vaneless Diffuser Width on Rotating Stall),” Trans. Jpn. Soc. Mech. Eng. Ser. B, 54(499), pp. 589–594. [CrossRef]
Marshall, D. F., and Sorokes, J. M., 2000, “A Review of Aerodynamically Induced Forces Acting on Centrifugal Compressors, and Resulting Vibration Characteristics of Rotors,” Proceedings of the 29th Turbomachinery Symposium, Houston, TX, September 18- 21.
Smith, D. R., and Wachel, J. C., 1983, “Nonsynchronous Forced Vibration in Centrifugal Compressors,” Turbomach. Int. Mag., January/February, pp. 21–24.
Colding-Jørgensen, J., 1980, “Effect of Fluid Forces on Rotor Stability of Centrifugal Compressors and Pumps,” Instability Problems in High-Performance Turbomachinery, NASA, Lewis Res. Center Rotordyn., Technical Report, pp. 249–265.
Toni, L., Ballarini, V., Cioncolini, S., Gaetani, P., and Persico, G., 2010, “Unsteady Flow Field Measurements in an Industrial Centrifugal Compressor,” Proceedings of the 39th Turbomachinery Symposium, Houston, TX, October 4–7.
Cumpsty, N. A., 1989, Compressor Aerodynamics, Krieger, New York.
Japiske, D., 1996, Centrifugal Compressor Design and Performance, Concepts Eti, White River Junction, VT.
Drake, A. W., 1988, Fundamentals of Applied Probability Theory, McGraw-Hill, New York.
Perlman, B. S., and Auerbach, V. H., 1977, “Phase-Locking Technique for Estimating the Ensemble Average of Time Series Data,” IEEE Trans. Acoust., Speech, Signal Process., ASSP-25(4), pp. 295–299. [CrossRef]
Porat, B., 2008, Digital Processing of Random Signals: Theory and Methods, Dover, London.
Turbomachinery Research Consortium, 2002, “XLTRC2 Rotordynamics Software Suite (2002)”, Turbomachinery Laboratory, Technical Report, Texas A&M University, College Station, TX.
Yoshida, Y., Tsujimoto, Y., Yokoyama, D., Ohashi, H., and Kano, F., “Rotordynamic Fluid Force Moments on an Open-Type Centrifugal Compressor Impeller in Precessing Motion,” Int. J. Rotat. Mach., 7(4), pp. 237–251. [CrossRef]
Colding-Jørgensen, J., 1994, “Prevention of Rotordynamic Problems in High Pressure Centrifugal Compressors,” Proceedings of the 1st International Conference on Turbomachinery, Rotating Equipment and Condition Monitoring Equipment, Singapore, July 20–22.
Ishimoto, L., Silva, R. T., Rangel, J. S., Jr., Miranda, M. A., Audehove, F. N., Marques, B. S., Baldassarre, L., and Puaut, C., 2012, “Early Detection of Rotating Stall Phenomenon in Centrifugal Compressors by Means of ASME PTC 10 Type 2 Test,” Proceedings of the Forty-First Turbomachinery Symposium, Houston, TX, Sept. 24–27.
Gerbet, M., Vannini, G., Catanzaro, M., Alban, T., 2012, “Rotordynamic Evaluation of Full Scale Rotor on Tilting Pad Bearings With Integral Squeeze Film Dampers,” Proceedings of the ASME Turbo Expo 2012, Copenhagen, Denmark, June 11–15.
API Standard 617, 2002, “Axial and Centrifugal Compressors and Expander-Compressors for Petroleum, Chemical and Gas Service Industry,” 7th ed., American Petroleum Institute, Washington, DC.

Figures

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Fig. 1

Schematic view of the tested configuration

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Fig. 2

Circumferential positioning of the dynamic pressure sensors

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Fig. 3

Joint time-frequency graph of the test

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Fig. 4

Evolution of the area subtended to the stall frequency versus the flow coefficient

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Fig. 5

Power spectrum of the pressure probes at Section 20 at the beginning of the analysis window

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Fig. 6

Pressure signal of Probe 1 at Section 20 and its autocorrelation function

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Fig. 7

Pressure signals of Probes 1 and 2 at Section 20 and their cross correlation function

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Fig. 8

Calculated circumferential pressure distribution due to rotating stall (with standard deviation)

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Fig. 9

Polar representation of the single-lobe stall pattern

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Fig. 10

The rotor's numerical model and mechanical drawing

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Fig. 11

Comparison between the experimental power spectrum of the vibration probe near the impeller and the predicted value using the rotordynamic model

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Fig. 12

Measured vibrations of the whole compressor during the experimental tests

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Fig. 13

Comparison between the determined vibrations and experiments (vibration probe nearest to the impeller)

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Fig. 14

Predicted vibrations in the real compressor at the nearest bearing to the stalling impeller with conventional journal bearings

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Fig. 15

Predicted vibrations in the real compressor at the nearest bearing to the stalling impeller with SFDs

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