Abstract
The present work deals with experimental measurements of rotordynamic force coefficients for two types of impellers: open (unshrouded) and closed (front shrouded). The impellers were designed to work in a turbopump with a cryogenic fluid, but experiments were performed in a test rig where water is used as working fluid. All the tests were conducted with a vaned diffuser. For both configurations, the supply pressure is 0.6 MPa, knowing that the whole test rig is pressurized at 0.5 MPa. The rotor is centered and the operating rotating speeds are 2000, 3000, and 5000 rpm. For each rotor speed, according to a double conical hydrostatic thrust bearing and eight piezo electric actuators, dynamic displacements in two different directions are applied to the rotating impeller, within a frequency range from 20 to 110 Hz. The resulting displacements and forces are measured in order to identify rotordynamic force coefficients using complex impedances. Stiffness and damping coefficients are compared and discussed in order to highlight the influence of the shroud together with the eye-packing seal and front casing on the impellers performance.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Notes
- 1.
Ariane Group has proceeded to many CFD simulations, using FINE/Turbo, in order to define the theoretical performance curves.
References
Jeon, S.M., Kwak, H.D., Yoon, S.H., Kim, J.: Rotordynamic analysis of a turbopump with the casing structural flexibility. J. Propuls. Power 24(3), 433–436 (2008)
Fayolle, P., Lambert, P.-A., Gelain, P., Fonteyn, P., Olofsson, H., Ore, S., Supie, P., Dehouve, J.: Major achievements reached through TPX LH2-Turbopump demonstration program. In: 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, San Diego, July 2011
Jolly, P., Arghir, M., Bonneau, O., Hassini, M.: Experimental and theoretical rotordynamic coefficients of smooth and round-hole pattern water-fed annular seals. ASME. J. Eng. Gas Turbines Power 140(11), 112501–112508 (2018)
Yoshida, Y., Tsujimoto, Y., Yokoyama, D., Ohashi, H., Kano F.: Rotordynamic fluid force moments on an open-type centrifugal compressor impeller in precessing motion. Int. J. Rotating Mach. 7(4), 237–251 (2001)
Uchiumi, M., Nagao, N., Yoshida, Y., Eguchi, M.: Comparison of rotordynamic fluid forces between closed impeller and open impeller. In: Proceedings of ASME. Fluids Engineering Division Summer Meeting, Rio Grande, 8–12 July 2013
Valentini, D., Pace, G., Pasini, A., Torre, L., Hadavandi, R., d’Agostino, L.: Analyses of hydrodynamic radial forces on centrifugal pump impellers. Eur. J. Mech. B/Fluids 61, 336–345 (2017)
Bolleter, U., Wyss, A., Welte, I., Sturchler, R.: Measurement of hydrodynamic interaction matrices of boiler feed pump impellers. ASME. J. Vib. Acoust. 109(2), 144–151 (1987)
Childs, D.W.: Turbomachinery Rotordynamics: Phenomena, Modeling and Analysis. Wiley, New York (1993)
Corbo, M.A., Malanoski, S.B.: Pump rotordynamics made simple. In: Proceedings of the Fifteenth International Pump Users Symposium, Turbomachinery Laboratory Texas A M University, College Station, pp. 167–204 (1998)
Acknowledgements
The authors are grateful to Centre National d’Etudes Spatiales (CNES) and to ARIANE GROUP for using the BALAFRE test rig and for their agreement to present this experimental work. This work was partially funded by the French Government “Investments for the Future” program (EQUIPEX GAP, PIA, ANR-11-EQUIPEX-0018).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2021 Springer Nature Switzerland AG
About this paper
Cite this paper
Jolly, P., Bonneau, O., Arghir, M. (2021). Rotordynamic Force Coefficients for Open and Shrouded Impellers. In: Oberst, S., Halkon, B., Ji, J., Brown, T. (eds) Vibration Engineering for a Sustainable Future. Springer, Cham. https://doi.org/10.1007/978-3-030-46466-0_15
Download citation
DOI: https://doi.org/10.1007/978-3-030-46466-0_15
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-46465-3
Online ISBN: 978-3-030-46466-0
eBook Packages: EngineeringEngineering (R0)