Behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller
Dynamic fluid forces acting on an impeller of a diffuser type mixed flow pump have been studied. The behavior of the thrust generated by the vortex occurrence in a pump intake sump was investigated. The force of distinct discontinuities such as hysteresis phenomenon from a pump hydraulic performance...
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2016-04-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/82/837/82_15-00580/_pdf/-char/en |
| _version_ | 1811221201009246208 |
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| author | Yuji KANEMORI Yasuo HANDA |
| author_facet | Yuji KANEMORI Yasuo HANDA |
| author_sort | Yuji KANEMORI |
| collection | DOAJ |
| description | Dynamic fluid forces acting on an impeller of a diffuser type mixed flow pump have been studied. The behavior of the thrust generated by the vortex occurrence in a pump intake sump was investigated. The force of distinct discontinuities such as hysteresis phenomenon from a pump hydraulic performance was measured. In pump partial load operation the radial thrust increases discontinuously because of the reverse flow at impeller inlet. The radial and axial thrust discontinuities occur at different threshold flow rates when increasing or decreasing the pump discharge flow thereby composing a hysteresis loop. Synchronous and non-synchronous components of radial thrust increase during the onset of reverse flow zones. A prediction method for dynamic radial thrust was derived based on Black's theory. Qualitative comparison with the measured experimental results for dynamic radial thrust showed reasonable agreement around pump best efficiency flow rate. The pump intake sump test apparatus, in which both an air-entrained surface vortex and a submerged vortex will occur, was employed and the radial thrust was measured. The level of radial thrust is dependent on the pump intake sump water level. The radial thrust begins to increase due to the occurrence of a full air core vortex to intake. When submerged as well as full air core continuous vortices occur, the radial thrust and the fluctuation of total pump head become abruptly large. The fluctuation of radial thrust becomes the highest when the impeller blade cutting the air-drawing large vortex imposes shock-like forces which generate not only an unbalance force but also nZ vane passing component. |
| first_indexed | 2024-04-12T07:55:16Z |
| format | Article |
| id | doaj.art-2ea5f0e96a31483587e37b1569c09f04 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T07:55:16Z |
| publishDate | 2016-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-2ea5f0e96a31483587e37b1569c09f042022-12-22T03:41:30ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612016-04-018283715-0058015-0058010.1299/transjsme.15-00580transjsmeBehavior of dynamic radial thrust acting on a vertical mixed flow pump impellerYuji KANEMORI0Yasuo HANDA1TORISHIMA PUMP Mfg. Co., Ltd. Engineering DivTORISHIMA PUMP Mfg. Co., Ltd. Engineering DivDynamic fluid forces acting on an impeller of a diffuser type mixed flow pump have been studied. The behavior of the thrust generated by the vortex occurrence in a pump intake sump was investigated. The force of distinct discontinuities such as hysteresis phenomenon from a pump hydraulic performance was measured. In pump partial load operation the radial thrust increases discontinuously because of the reverse flow at impeller inlet. The radial and axial thrust discontinuities occur at different threshold flow rates when increasing or decreasing the pump discharge flow thereby composing a hysteresis loop. Synchronous and non-synchronous components of radial thrust increase during the onset of reverse flow zones. A prediction method for dynamic radial thrust was derived based on Black's theory. Qualitative comparison with the measured experimental results for dynamic radial thrust showed reasonable agreement around pump best efficiency flow rate. The pump intake sump test apparatus, in which both an air-entrained surface vortex and a submerged vortex will occur, was employed and the radial thrust was measured. The level of radial thrust is dependent on the pump intake sump water level. The radial thrust begins to increase due to the occurrence of a full air core vortex to intake. When submerged as well as full air core continuous vortices occur, the radial thrust and the fluctuation of total pump head become abruptly large. The fluctuation of radial thrust becomes the highest when the impeller blade cutting the air-drawing large vortex imposes shock-like forces which generate not only an unbalance force but also nZ vane passing component.https://www.jstage.jst.go.jp/article/transjsme/82/837/82_15-00580/_pdf/-char/enfluid forceflow induced vibrationforced vibrationpumpvortexswirling flowhysteresis |
| spellingShingle | Yuji KANEMORI Yasuo HANDA Behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller Nihon Kikai Gakkai ronbunshu fluid force flow induced vibration forced vibration pump vortex swirling flow hysteresis |
| title | Behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller |
| title_full | Behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller |
| title_fullStr | Behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller |
| title_full_unstemmed | Behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller |
| title_short | Behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller |
| title_sort | behavior of dynamic radial thrust acting on a vertical mixed flow pump impeller |
| topic | fluid force flow induced vibration forced vibration pump vortex swirling flow hysteresis |
| url | https://www.jstage.jst.go.jp/article/transjsme/82/837/82_15-00580/_pdf/-char/en |
| work_keys_str_mv | AT yujikanemori behaviorofdynamicradialthrustactingonaverticalmixedflowpumpimpeller AT yasuohanda behaviorofdynamicradialthrustactingonaverticalmixedflowpumpimpeller |