The fluid-induced rotordynamic forces acting on a whirling space turbopump composed by an inducer and a radial impeller have been compared to the same forces measured on each single component of the turbomachine (i.e., on the inducer and on the radial impeller). The experimental campaign has been carried out in cold water at design and off-design conditions (80%, 100%, and 120% of the design flow rate) both in noncavitating (NC) and cavitating regimes. The paper illustrates the different trends of the rotordynamic forces on the axial and radial pumps and highlights their contributions on the overall turbomachine. At positive whirl ratios, the behavior of the inducer is dominant while, at negative ones, both the pumps show the same trends in such a way that the overall behavior is roughly the sum of each single component.

References

References
1.
Rocket Lab, 2017, “Rocket Lab Website,” Rocket Lab, Huntington Beach, CA, accessed Oct. 3, 2017, http://www.Rocketlabusa.com/
2.
Bhattacharyya
,
A.
,
Acosta
,
A. J.
,
Brennen
,
C. E.
, and
Caughey
,
T. K.
,
1997
, “
Rotordynamic Forces in Cavitating Inducers
,”
ASME J. Fluids Eng.
,
119
(
4
), pp.
768
774
.
3.
Bhattacharyya
,
A.
,
1994
, “
Internal Flows and Force Matrices in Axial Flow Inducers
,”
Ph.D. thesis
, California Institute of Technology, Pasadena, CA.https://authors.library.caltech.edu/45285/
4.
Franz
,
R. J.
,
1989
, “
Experimental Investigation of the Effect of Cavitation on the Rotordynamic Forces on a Whirling Centrifugal Pump Impeller
,”
Ph.D. thesis
, California Institute of Technology, Pasadena, CA.https://thesis.library.caltech.edu/467/
5.
Rosenmann
,
W.
,
1965
, “
Experimental Investigations of Hydrodynamically Induced Shaft Forces With a Three Bladed Inducer
,”
ASME Symposium on Cavitation in Fluid Machinery
, Chicago, IL, Nov. 7–11, pp.
172
195
.https://ntrs.nasa.gov/search.jsp?R=19660038884
6.
Ehrich
,
F.
, and
Childs
,
S. D.
,
1984
, “
Self-Excited Vibrations in High Performance Turbomachinery
,”
Mech. Eng.
,
106
, pp.
66
79
.https://trid.trb.org/view/419027
7.
Jery
,
B.
,
1987
, “
Experimental Study of Unsteady Hydrodynamic Force Matrices on Whirling Centrifugal Pump Impellers
,”
Doctoral dissertation
, California Institute of Technology, Pasadena, CA.https://thesis.library.caltech.edu/1144/
8.
Suzuki
,
T.
,
Prunières
,
R.
,
Horiguchi
,
H.
,
Tsukiya
,
T.
,
Taenaka
,
Y.
, and
Tsujimoto
,
Y.
,
2007
, “
Measurements of Rotordynamic Forces on an Artificial Heart Pump Impeller
,”
ASME J. Fluids Eng.
,
129
(
11
), pp.
1422
1427
.
9.
Valentini
,
D.
,
Pace
,
G.
,
Pasini
,
A.
,
Hadavandi
,
R.
, and
d'Agostino
,
L.
,
2016
, “
Fluid-Induced Rotordynamic Forces on a Whirling Centrifugal Pump
,”
International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC)
, Honolulu, HI, Apr. 10-15, Paper No.
318
.http://isromac-isimet.univ-lille1.fr/upload_dir/finalpaper/318.finalpaper.pdf
10.
Torre
,
L.
,
Pasini
,
A.
,
Cervone
,
A.
, and
d'Agostino
,
L.
,
2011
, “
Experimental Characterization of the Rotordynamic Forces on Space Rocket Axial Inducers
,”
ASME J. Fluids Eng.
,
133
(
10
), p.
101102
.
11.
Pasini
,
A.
,
Torre
,
L.
,
Cervone
,
A.
, and
d'Agostino
,
L.
,
2011
, “
Continuous Spectrum of the Rotordynamic Forces on a Four Bladed Inducer
,”
ASME J. Fluids Eng.
,
133
(
12
), p.
121101
.
12.
Valentini
,
D.
,
Pace
,
G.
,
Torre
,
L.
,
Pasini
,
A.
, and
d'Agostino
,
L.
,
2015
, “
Influences of the Operating Conditions on the Rotordynamic Forces Acting on a Three-Bladed Inducer Under Forced Whirl Motion
,”
ASME J. Fluids Eng.
,
137
(
7
), p.
071304
.
13.
Pace
,
G.
,
Pasini
,
A.
,
Torre
,
L.
,
Valentini
,
D.
, and
d'Agostino
,
L.
,
2012
, “
The Cavitating Pump Rotordynamic Test Facility at ALTA SpA: Upgraded Capabilities of a Unique Test Rig
,”
Space Propulsion Conference
, Bordeaux, France, May 7–10.https://pdfs.semanticscholar.org/fbd1/1d0eef026e7cd28054620467dcd1d52f36f0.pdf
14.
Torre
,
L.
,
Pasini
,
A.
,
Cervone
,
A.
, and
d'Agostino
,
L.
,
2011
, “
Continuous Spectrum of the Rotordynamic Forces on a Four Bladed Inducer
,”
ASME
Paper No. AJK2011-06042.
15.
Valentini
,
D.
,
Pace
,
G.
,
Pasini
,
A.
,
Torre
,
L.
,
Hadavandi
,
R.
, and
d'Agostino
,
L.
,
2017
, “
Fluid-Induced Rotordynamic Forces on a Whirling Centrifugal Pump
,”
Eur. J. Mech. B/Fluids
,
61
(
Part 2
), pp.
336
345
.
16.
d'Agostino
,
L.
,
Torre
,
L.
,
Pasini
,
A.
, and
Cervone
,
A.
,
2008
, “
On the Preliminary Design and Noncavitating Performance of Tapered Axial Inducers
,”
ASME J. Fluids Eng.
,
130
(
11
), p.
111303
.
17.
d'Agostino
,
L.
,
Torre
,
L.
,
Pasini
,
A.
,
Baccarella
,
D.
,
Cervone
,
A.
, and
Milani
,
A.
,
2008
, “
A Reduced Order Model for Preliminary Design and Performance Prediction of Tapered Inducers: Comparison With Numerical Simulations
,”
AIAA
Paper No. 2008-5119.
18.
d'Agostino
,
L.
,
Pasini
,
A.
, and
Valentini
,
D.
,
2011
, “
A Reduced Order Model for Preliminary Design and Performance Prediction of Radial Turbopumps
,”
AIAA
Paper No. 2011-5783.
19.
d'Agostino
,
L.
,
Pasini
,
A.
,
Valentini
,
D.
,
Pace
,
G.
,
Torre
,
L.
, and
Cervone
,
A.
,
2012
, “
A Reduced Order Model for Optimal Centrifugal Pump Design
,”
14th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
(ISROMAC), Honolulu, HI, Feb. 27–Mar. 2.
20.
Valentini
,
D.
,
Pasini
,
A.
,
Pace
,
G.
,
Torre
,
L.
, and
d'Agostino
,
L.
,
2013
, “
Experimental Validation of a Reduced Order for Radial Turbopump Design
,”
AIAA
Paper No. AIAA 2013-4065.
21.
Brennen
,
C. E.
,
Franz
,
R.
, and
Arndt
,
N.
,
1988
, “
Rotor/Stator Unsteady Pressure Interaction
,”
Third Earth to Orbit Propulsion Conference
, Huntsville, AL, Dec. 30, pp.
240
253
.https://authors.library.caltech.edu/54/
22.
Torre
,
L.
,
Cervone
,
A.
,
Pasini
,
A.
, and
d'Agostino
,
L.
,
2011
, “
Experimental Characterization of Thermal Cavitation Effects on Space Rocket Axial Inducers
,”
ASME J. Fluids Eng.
,
133
(
11
), p.
111303
.
23.
Bently
,
D. E.
, and
Muszynska
,
A.
,
1982
, “
Stability Evaluation of Rotor/Bearing System by Perturbation Tests
,”
Workshop on Rotor Dynamic Instability Problems in High Performance Turbomachinery
, College Station, TX, May 10–12, pp. 307–322.http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADP000365
24.
Wachel
,
J. C.
,
1982
, “
Rotordynamic Instability Field Problems
,”
Second Workshop Instability of High Performance Turbomachinery
, College Station, TX, May 10–12.https://ntrs.nasa.gov/search.jsp?R=19830007359
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