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Research Papers: Flows in Complex Systems

Rotordynamic Forces Acting on a Two-Stage Inducer

[+] Author and Article Information
Naoki Nagao

Research and Development Directorate,
Japan Aerospace Exploration Agency,
2-1-1 Sengen,
Tsukuba, Ibaraki 305-8505,
Japan e-mail: nagao.naoki@jaxa.jp

Katsuji Nagaura

Operations Department,
Foundation for Promotion of
Japanese Aero-Space Technology,
1 Kimigaya Aza Koganezawa,
Kakuda, Miyagi 981-1525, Japan
e-mail: nagaura.katsuji@jaxa.jp

Tsutomu Tamura

Operations Department,
Foundation for Promotion of
Japanese Aero-Space Technology,
1 Kimigaya Aza Koganezawa,
Kakuda, Miyagi 981-1525, Japan
e-mail: tamura.tsutomu@jaxa.jp

Satoshi Hasegawa

Research and Development Directorate,
Japan Aerospace Exploration Agency,
1 Kimigaya Aza Koganezawa,
Kakuda, Miyagi 981-1525, Japan
e-mail: hasegawa.satoshi@jaxa.jp

Masaharu Uchiumi

Research and Development Directorate,
Japan Aerospace Exploration Agency,
1 Kimigaya Aza Koganezawa,
Kakuda, Miyagi 981-1525, Japan
e-mail: uchiumi.masaharu@jaxa.jp

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 9, 2016; final manuscript received May 15, 2017; published online November 3, 2017. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 140(2), 021112 (Nov 03, 2017) (6 pages) Paper No: FE-16-1588; doi: 10.1115/1.4037986 History: Received September 09, 2016; Revised May 15, 2017

Rocket turbopumps sometimes experience self-excited shaft vibration due to rotordynamic forces. To prevent this vibration, a key step is to establish a method to measure and evaluate the rotordynamic forces that act on turbopump components. In this study, we measured rotordynamic forces acting on a two-stage inducer using a rotordynamic test stand developed in 2012 at Kakuda Space Center. In noncavitating conditions, we did not observe strong nonlinearities in rotordynamic forces in the inducer at low flow rate conditions. The results of the pressure fluctuation on the inducer showed that rotordynamic forces were mainly excited in the second stage of the inducer. In cavitating conditions, we found that there is no strong nonlinearity between cavitating rotordynamic forces and the whirling frequency ratio in the inducer. These results show the robustness of the rotordynamic forces acting on the inducer against the flow rate and cavitation.

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References

Yoshida, Y. , Eguchi, M. , Motomura, T. , Uchiumi, M. , Kure, H. , and Maruta, Y. , 2010, “ Rotordynamic Forces Acting on Three-Bladed Inducer Under Supersynchronous/Synchronous Rotating Cavitation,” ASME J. Fluids Eng., 132(6), p. 061105. [CrossRef]
Pasini, A. , Torre, L. , Cervone, A. , and d'Agostino, L. , 2010, “ Rotordynamic Forces on a Four Bladed Inducer,” AIAA Paper No. 2010-7051.
Nagao, N. , Eguchi, M. , Uchiumi, M. , and Yoshida, Y. , 2012, “ Measurement of Rotordynamic Forces on a Turbopump,” J. TSJ, 40(7), pp. 426–432.
Eguchi, M. , and Maruta, Y. , 2003, “ Development of Rotordynamics Measurement System With Active Magnetic Bearings,” Tenth Asia-Pacific Vibration Conference, Gold Coast, Australia, Nov. 12–14, pp. 115–120.
Brennen, C. E. , 1994, Hydrodynamics of Pumps, Oxford University Press, Oxford, UK.
Arndt, N. , and Franz, R. , 1986, “ Observations of Hydrodynamic Forces on Several Inducers Including the SSME LPOTP,” Division of Engineering and Application Science, California Institute of Technology, Pasadena, CA, Report No. E249.3.

Figures

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Fig. 1

Appearance of the JARTS

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Fig. 2

Magnetic bearings in the vibration exciter

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Fig. 3

Control system diagram

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Fig. 6

Four fluctuation sensor ports on the acrylic casing

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Fig. 7

Definition of the rotordynamic forces

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Fig. 8

Performance curve at noncavitating condition

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Fig. 9

Characteristics of fn and ft related to varied Q/Qn

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Fig. 10

Fast Fourier transform analyses of pressure fluctuation on inducer

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Fig. 11

Cavitation around the inducer related to cavitation number

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Fig. 12

Characteristics of fn and ft related to cavitation number

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