In very low specific speed range , the efficiency of the centrifugal pump designed by the conventional method becomes remarkably low. Therefore, positive-displacement pumps have been widely used for long. However, the positive-displacement pumps remain associated with problems such as noise and vibration and they require high manufacturing precision. Since the recently used centrifugal pumps are becoming higher in rotational speed and smaller in size, there appear to be many expectations to develop a new centrifugal pump with high performance in the very low specific speed range. The purpose of this study is to investigate the internal flow characteristics and its influence on the performance of a very low specific speed centrifugal pump. The results show that large reverse flow at the semi-open impeller outlet decreases absolute tangential velocity considerably which in turn decreases the pumping head.
Issue Section:
Technical Papers
1.
Stepanoff
, A. J.
, 1957, Centrifugal and Axial Flow Pumps
, 2nd ed., Wiley
, New York, pp. 69
–89
.2.
Rodgers
, C.
, 1990, “Experiments With a Low-Specific-Speed Partial Emission Centrifugal Compressor
,” ASME J. Turbomach.
0889-504X, 112
, pp. 30
–37
.3.
Abramian
, M.
, and Howard
, J. H. G.
, 1994, “Experimental Investigation of the Steady and Unsteady Relative Flow in a Model Centrifugal Impeller Passage
,” ASME J. Turbomach.
0889-504X, 116
, pp. 269
–279
.4.
Worster
, R. C.
, 1963, “The Flow in Volutes and Its Effects on Centrifugal Pump Performance
,” Proc. Inst. Mech. Eng.
0020-3483, 177
(31
), pp. 843
–871
.5.
Kurokawa
, J.
, Matsumoto
, K.
, Matsui
, J.
, and Kitahora
, T.
, 1998, “Performances of Centrifugal Pumps of Very Low Specific Speed
,” in Proceedings of the 19th IAHR Symposium on Hydraulic Machinery and Cavitation
, Singapore
, 2, pp. 833
–842
.6.
Kurokawa
, J.
, Matsumoto
, K.
, Matsui
, J.
, and Imamura
, H.
, 2000, “Performance Improvement and Peculiar Behavior of Disk Friction and Leakage in Very Low Specific-Speed Pumps
,” Proceedings of the 20th IAHR Symposium on Hydraulic Machinery and Systems
, Charlotte, USA
, CD-ROM Paper No.3B(PD-02).7.
Ohta
, H.
, and Aoki
, K.
, 1990, “Study on Centrifugal Pump for High-Viscosity Liquids (Effect of Impeller Blade Number on the Pump Performance)
,” Trans. Jpn. Soc. Mech. Eng., Ser. B
0387-5016, 56
(644
), pp. 1702
–1707
.8.
Minemura
, K.
, Kinoshita
, K.
, Ihara
, M.
, and Egashira
, K.
, 1995, “Effects of Design Parameters on Air-Water Two-Phase Flow Performance of a Radial-Flow Pump
,” Trans. Jpn. Soc. Mech. Eng., Ser. B
0387-5016, 61
(588
), pp. 2996
–3004
.9.
Choi
, Y-D.
, Kurokawa
, J.
, Matsui
, J.
, and Imamura
, H.
, 2002, “Internal flow characteristics of a centrifugal pump with very low specific speed
,” in Proceedings of the 21st IAHR Symposium on Hydraulic Machinery and Systems
, Lausanne, Switzerland
, 1, pp. 317
–323
.10.
Choi
, Y-D.
, Kurokawa
, J.
, Matsui
, J.
, and Imamura
, H.
, 2002, “An Experimental Study on the Internal Flow Characteristics of a Very Low Specific-Speed Centrifugal Pump
,” Proceedings of the 5th JSME-KSME Fluids Engineering Conference
, Nagoya, Japan
, CD-ROM Paper No. OS16-3-6.11.
Choi
, Y-D.
, Nishino
, K.
, Kurokawa
, J.
, and Matsui
, J.
, 2004, “PIV Measurement of Internal Flow Characteristics of Very Low Specific Speed Semi-open Impeller
,” Exp. Fluids
0723-4864, 37
, pp. 617
–630
.12.
Raffel
, M.
, Willert
, C.
, and Kompenhans
, J.
, 1998, Particle Image Velocimetry—A Practical Guide
, Springer-Verlag
, New York, pp. 105
–146
.13.
Nishino
, K.
, and Torii
, K.
, 1993, “A Fluid-Dynamically Optimum Particle Tracking Method for 2-D PTV: Triple Pattern Matching Algorithm
,” in Proceedings of the 6th International Symposium on Transport Phenomena in Thermal Engineering (ISTP-VI)
, Seoul, Korea
, pp. 1411
–1416
.14.
Abernethy
, R. B.
, Benedict
, R. P.
, and Dowdell
, R. B.
, 1985, “ASME Measurement Uncertainty
,” ASME J. Fluids Eng.
0098-2202, 107
, pp. 161
–164
.15.
Kurokawa
, J.
, and Amasaka
, Y.
, 1983, “A Study on the Internal Flow of Spiral Casing - Part 2: Experimental Determinations of Flow Characteristics in Volutes
,” Trans. Jpn. Soc. Mech. Eng., Ser. B
0387-5016, 49
(448
), pp. 2735
–2745
.16.
Wiesner
, F. J.
, 1967, “A Review of Slip Factors for Centrifugal Impellers
,” ASME J. Eng. Power
0022-0825, 89
, pp. 558
–572
.17.
Murakami
, M.
, Kikuyama
, K.
, and Asakura
, E.
, 1980, “Velocity and Pressure Distributions in the Impeller Passages of Centrifugal Pumps
,” ASME J. Fluids Eng.
0098-2202, 102
, pp. 420
–426
.18.
Miyamoto
, H.
, and Ohba
, H.
, 1995, “The Effect of Flow Rate on Characteristics in Centrifugal Impellers
,” JSME Int. J., Ser. B
1340-8054, 38
(1
), pp. 25
–30
.Copyright © 2006
by American Society of Mechanical Engineers
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