The Experts below are selected from a list of 1626 Experts worldwide ranked by ideXlab platform
Shigeo Tanaka - One of the best experts on this subject based on the ideXlab platform.
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study for the increase of micro Regenerative Pump head
International Journal of Fluid Machinery and Systems, 2009Co-Authors: Hironori Horiguchi, Keisuke Wakiya, Masaaki Sakagami, Yoshinobu Tsujimoto, Shigeo TanakaAbstract:The effect of inlet and outlet blade angles on a micro Regenerative Pump head was examined in experiments. The Pump head was little increased by changing the blade angles compared with the original Pump with the inlet and outlet blade angles of 0 degree. The effect of the axial clearance between the impeller and the casing on the Pump head was also examined. The head was increased largely by decreasing the axial clearance. The computation of the internal flow was performed to clarify the cause of the increase of the Pump head due to the decrease of the clearance. The local flow rate in the casing decreased as the leakage flow rate through the axial clearance decreased due to the decrease of the clearance. It was found that the larger head in the smaller clearance was just caused by the smaller local flow rate in the casing. In the case of the smaller clearance, the smaller local flow rate caused the smaller circumferential velocity near the front and rear sides of the impeller. This caused the increase of the angular momentum in the casing and the head.
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effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance
International Journal of Fluid Machinery and Systems, 2009Co-Authors: Hironori Horiguchi, Masaaki Sakagami, Yoshinobu Tsujimoto, Shinji Matsumoto, Shigeo TanakaAbstract:The effect of symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance was studied. The shut off head of the Pump with the symmetric impeller was about 2.5 times as that with the asymmetric impeller. The computation of the internal flow was performed to clarify the cause of the increase of the head. It was found that the contribution of the angular momentum supply was larger than that of shear stress for the head development in both cases. The larger head and momentum supply in the case of the symmetric impeller were caused by larger recirculated flow rate and larger angular momentum difference between the inlet and outlet to the impeller. The larger recirculated flow rate was caused by smaller pressure gradient in the direction of recirculated flow. The decrease of the circumferential velocity in the casing was attributed to the smaller local flow rate in the casing.
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Study for the Increase of Micro Regenerative Pump Head
Transactions of the Japan Society of Mechanical Engineers. B, 2008Co-Authors: Hironori Horiguchi, Keisuke Wakiya, Masaaki Sakagami, Yoshinobu Tsujimoto, Shigeo TanakaAbstract:The effect of inlet and outlet blade angles on the performance of a micro Regenerative Pump was examined. The head of the Regenerative Pump was little increased by changing the blade angles compared with the original Pump with the inlet and outlet blade angles of 0 degree. The effect of the axial clearance on the performance was also examined. The head was increased largely by decreasing the axial clearance. The computation of the internal flow was performed to clarify the cause of the increase of the head due to the decrease of the clearance. The local flow rate in the casing decreased as the leakage flow rate through the axial clearance decreased due to the decrease of the clearance. By offsetting the performance curve with the local flow rate, the effect of the clearance did not appear and it was found that the larger head in the smaller clearance was just caused by the smaller local flow rate in the casing. In the case of the smaller clearance, the smaller local flow rate caused the smaller circumferential velocity near the front and rear sides of the impeller, and the angular momentum in the casing and the head increased.
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effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance
Transactions of the Japan Society of Mechanical Engineers. B, 2008Co-Authors: Hironori Horiguchi, Masaaki Sakagami, Yoshinobu Tsujimoto, Shinji Matsumoto, Shigeo TanakaAbstract:The effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance was studied. It was found that the shut off head of the Pump with the symmetric impeller was about 2.5 times as that with the asymmetric impeller. The computation of the internal flow was performed to clarify the cause of the increase of the head. It was found that the contribution of the angular momentum supply was larger than that of shear stress for the head development for both cases. The larger head and momentum supply with the symmetric impeller were caused by larger recirculated flow rate and larger angular momentum difference between the inlet and outlet to the impeller. The larger recirculated flow rate was caused by smaller pressure gradient in the direction of recirculated flow. The decrease of the circumferential velocity in the casing was attributed to the smaller local flow rate in the casing.
Armin Baumgartner - One of the best experts on this subject based on the ideXlab platform.
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design study of a Regenerative Pump using one dimensional and three dimensional numerical techniques
European Journal of Mechanics B-fluids, 2012Co-Authors: Francis Quail, T J Scanlon, Armin BaumgartnerAbstract:Abstract Regenerative Pumps are low cost, compact and able to deliver high heads at low flowrates. Furthermore with stable performance characteristics they can operate with very small NPSH. The complexity of the flowfield is a serious challenge for any kind of mathematical modelling. This paper compares an analytical and numerical technique of resolving the performance for a new Regenerative Pump design. The performance characteristics computed by a CFD approach and a new one-dimensional model are compared and matched to experimental test results. The approaches of both modelling techniques are assessed as potential design tools. The approaches are shown to not only successfully resolve the complex flowfield within the Pump; the CFD is also capable of resolving local flow properties to conduct further refinements. The flow field is represented by the CFD as it has never been before. A new design process is suggested. The new Regenerative Pump design is considered with a comparable duty centrifugal Pump, proving that for many high head low flowrate applications the Regenerative Pump is a better choice.
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A One-Dimensional Numerical Model for the Momentum Exchange in Regenerative Pumps
Journal of Engineering for Gas Turbines and Power, 2011Co-Authors: Francis Quail, Matthew Stickland, Armin BaumgartnerAbstract:The Regenerative Pump is a rotor-dynamic turbomachine capable of developing high heads at low flow rates and low specific speeds. In spite of their low efficiency, usually less than 50 %, they have found a wide range of applications as compact single-stage Pumps with other beneficial features. The potential of a modified Regenerative Pump design is presented for consideration of the performance improvements. In this paper the fluid dynamic behaviour of the novel design was predicted using a one-dimensional model developed by the authors. Unlike most one-dimensional models previously published for Regenerative Pumps, the momentum exchange is computed numerically. Previous one-dimensional models relied on experimental data and correction factors; the model presented in this paper demonstrates accurate prediction of the Pump performance characteristics without the need for correction with experimental data. The validity of this approach is highlighted by the comparison of computed and measured results for two different Regenerative Pump standards. The Pump performance is assessed numerically without the need of correction factors or other experimental data. This paper presents an approach for Regenerative Pumps using a physically valid geometry model and by resolving the circulatory velocity in peripheral direction.
Francis Quail - One of the best experts on this subject based on the ideXlab platform.
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design study of a Regenerative Pump using one dimensional and three dimensional numerical techniques
European Journal of Mechanics B-fluids, 2012Co-Authors: Francis Quail, T J Scanlon, Armin BaumgartnerAbstract:Abstract Regenerative Pumps are low cost, compact and able to deliver high heads at low flowrates. Furthermore with stable performance characteristics they can operate with very small NPSH. The complexity of the flowfield is a serious challenge for any kind of mathematical modelling. This paper compares an analytical and numerical technique of resolving the performance for a new Regenerative Pump design. The performance characteristics computed by a CFD approach and a new one-dimensional model are compared and matched to experimental test results. The approaches of both modelling techniques are assessed as potential design tools. The approaches are shown to not only successfully resolve the complex flowfield within the Pump; the CFD is also capable of resolving local flow properties to conduct further refinements. The flow field is represented by the CFD as it has never been before. A new design process is suggested. The new Regenerative Pump design is considered with a comparable duty centrifugal Pump, proving that for many high head low flowrate applications the Regenerative Pump is a better choice.
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A One-Dimensional Numerical Model for the Momentum Exchange in Regenerative Pumps
Journal of Engineering for Gas Turbines and Power, 2011Co-Authors: Francis Quail, Matthew Stickland, Armin BaumgartnerAbstract:The Regenerative Pump is a rotor-dynamic turbomachine capable of developing high heads at low flow rates and low specific speeds. In spite of their low efficiency, usually less than 50 %, they have found a wide range of applications as compact single-stage Pumps with other beneficial features. The potential of a modified Regenerative Pump design is presented for consideration of the performance improvements. In this paper the fluid dynamic behaviour of the novel design was predicted using a one-dimensional model developed by the authors. Unlike most one-dimensional models previously published for Regenerative Pumps, the momentum exchange is computed numerically. Previous one-dimensional models relied on experimental data and correction factors; the model presented in this paper demonstrates accurate prediction of the Pump performance characteristics without the need for correction with experimental data. The validity of this approach is highlighted by the comparison of computed and measured results for two different Regenerative Pump standards. The Pump performance is assessed numerically without the need of correction factors or other experimental data. This paper presents an approach for Regenerative Pumps using a physically valid geometry model and by resolving the circulatory velocity in peripheral direction.
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Design study of a novel Regenerative Pump using experimental and numerical techniques
2010Co-Authors: Francis Quail, Matthew Stickland, B. BaumgartnerAbstract:This paper presents a numerical and experimental analysis of a new Regenerative Pump design. The complex flow-field within Regenerative Pumps represents a significant challenge to previous published mathematical models. The new Pump design incorporates a new axial inlet and outlet port. The experimental and numerical results demonstrate that it is not only possible to resolve the flowfield for this Pump type but also demonstrates this Pump as a viable alternative to other kinetic rotodynamic machines. The use of the latest rapid manufacturing techniques have enabled the production of the complex geometry of the axial ports required for the new configuration.
Hironori Horiguchi - One of the best experts on this subject based on the ideXlab platform.
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study for the increase of micro Regenerative Pump head
International Journal of Fluid Machinery and Systems, 2009Co-Authors: Hironori Horiguchi, Keisuke Wakiya, Masaaki Sakagami, Yoshinobu Tsujimoto, Shigeo TanakaAbstract:The effect of inlet and outlet blade angles on a micro Regenerative Pump head was examined in experiments. The Pump head was little increased by changing the blade angles compared with the original Pump with the inlet and outlet blade angles of 0 degree. The effect of the axial clearance between the impeller and the casing on the Pump head was also examined. The head was increased largely by decreasing the axial clearance. The computation of the internal flow was performed to clarify the cause of the increase of the Pump head due to the decrease of the clearance. The local flow rate in the casing decreased as the leakage flow rate through the axial clearance decreased due to the decrease of the clearance. It was found that the larger head in the smaller clearance was just caused by the smaller local flow rate in the casing. In the case of the smaller clearance, the smaller local flow rate caused the smaller circumferential velocity near the front and rear sides of the impeller. This caused the increase of the angular momentum in the casing and the head.
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effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance
International Journal of Fluid Machinery and Systems, 2009Co-Authors: Hironori Horiguchi, Masaaki Sakagami, Yoshinobu Tsujimoto, Shinji Matsumoto, Shigeo TanakaAbstract:The effect of symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance was studied. The shut off head of the Pump with the symmetric impeller was about 2.5 times as that with the asymmetric impeller. The computation of the internal flow was performed to clarify the cause of the increase of the head. It was found that the contribution of the angular momentum supply was larger than that of shear stress for the head development in both cases. The larger head and momentum supply in the case of the symmetric impeller were caused by larger recirculated flow rate and larger angular momentum difference between the inlet and outlet to the impeller. The larger recirculated flow rate was caused by smaller pressure gradient in the direction of recirculated flow. The decrease of the circumferential velocity in the casing was attributed to the smaller local flow rate in the casing.
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Study for the Increase of Micro Regenerative Pump Head
Transactions of the Japan Society of Mechanical Engineers. B, 2008Co-Authors: Hironori Horiguchi, Keisuke Wakiya, Masaaki Sakagami, Yoshinobu Tsujimoto, Shigeo TanakaAbstract:The effect of inlet and outlet blade angles on the performance of a micro Regenerative Pump was examined. The head of the Regenerative Pump was little increased by changing the blade angles compared with the original Pump with the inlet and outlet blade angles of 0 degree. The effect of the axial clearance on the performance was also examined. The head was increased largely by decreasing the axial clearance. The computation of the internal flow was performed to clarify the cause of the increase of the head due to the decrease of the clearance. The local flow rate in the casing decreased as the leakage flow rate through the axial clearance decreased due to the decrease of the clearance. By offsetting the performance curve with the local flow rate, the effect of the clearance did not appear and it was found that the larger head in the smaller clearance was just caused by the smaller local flow rate in the casing. In the case of the smaller clearance, the smaller local flow rate caused the smaller circumferential velocity near the front and rear sides of the impeller, and the angular momentum in the casing and the head increased.
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effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance
Transactions of the Japan Society of Mechanical Engineers. B, 2008Co-Authors: Hironori Horiguchi, Masaaki Sakagami, Yoshinobu Tsujimoto, Shinji Matsumoto, Shigeo TanakaAbstract:The effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance was studied. It was found that the shut off head of the Pump with the symmetric impeller was about 2.5 times as that with the asymmetric impeller. The computation of the internal flow was performed to clarify the cause of the increase of the head. It was found that the contribution of the angular momentum supply was larger than that of shear stress for the head development for both cases. The larger head and momentum supply with the symmetric impeller were caused by larger recirculated flow rate and larger angular momentum difference between the inlet and outlet to the impeller. The larger recirculated flow rate was caused by smaller pressure gradient in the direction of recirculated flow. The decrease of the circumferential velocity in the casing was attributed to the smaller local flow rate in the casing.
Yoshinobu Tsujimoto - One of the best experts on this subject based on the ideXlab platform.
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study for the increase of micro Regenerative Pump head
International Journal of Fluid Machinery and Systems, 2009Co-Authors: Hironori Horiguchi, Keisuke Wakiya, Masaaki Sakagami, Yoshinobu Tsujimoto, Shigeo TanakaAbstract:The effect of inlet and outlet blade angles on a micro Regenerative Pump head was examined in experiments. The Pump head was little increased by changing the blade angles compared with the original Pump with the inlet and outlet blade angles of 0 degree. The effect of the axial clearance between the impeller and the casing on the Pump head was also examined. The head was increased largely by decreasing the axial clearance. The computation of the internal flow was performed to clarify the cause of the increase of the Pump head due to the decrease of the clearance. The local flow rate in the casing decreased as the leakage flow rate through the axial clearance decreased due to the decrease of the clearance. It was found that the larger head in the smaller clearance was just caused by the smaller local flow rate in the casing. In the case of the smaller clearance, the smaller local flow rate caused the smaller circumferential velocity near the front and rear sides of the impeller. This caused the increase of the angular momentum in the casing and the head.
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effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance
International Journal of Fluid Machinery and Systems, 2009Co-Authors: Hironori Horiguchi, Masaaki Sakagami, Yoshinobu Tsujimoto, Shinji Matsumoto, Shigeo TanakaAbstract:The effect of symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance was studied. The shut off head of the Pump with the symmetric impeller was about 2.5 times as that with the asymmetric impeller. The computation of the internal flow was performed to clarify the cause of the increase of the head. It was found that the contribution of the angular momentum supply was larger than that of shear stress for the head development in both cases. The larger head and momentum supply in the case of the symmetric impeller were caused by larger recirculated flow rate and larger angular momentum difference between the inlet and outlet to the impeller. The larger recirculated flow rate was caused by smaller pressure gradient in the direction of recirculated flow. The decrease of the circumferential velocity in the casing was attributed to the smaller local flow rate in the casing.
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Study for the Increase of Micro Regenerative Pump Head
Transactions of the Japan Society of Mechanical Engineers. B, 2008Co-Authors: Hironori Horiguchi, Keisuke Wakiya, Masaaki Sakagami, Yoshinobu Tsujimoto, Shigeo TanakaAbstract:The effect of inlet and outlet blade angles on the performance of a micro Regenerative Pump was examined. The head of the Regenerative Pump was little increased by changing the blade angles compared with the original Pump with the inlet and outlet blade angles of 0 degree. The effect of the axial clearance on the performance was also examined. The head was increased largely by decreasing the axial clearance. The computation of the internal flow was performed to clarify the cause of the increase of the head due to the decrease of the clearance. The local flow rate in the casing decreased as the leakage flow rate through the axial clearance decreased due to the decrease of the clearance. By offsetting the performance curve with the local flow rate, the effect of the clearance did not appear and it was found that the larger head in the smaller clearance was just caused by the smaller local flow rate in the casing. In the case of the smaller clearance, the smaller local flow rate caused the smaller circumferential velocity near the front and rear sides of the impeller, and the angular momentum in the casing and the head increased.
-
effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance
Transactions of the Japan Society of Mechanical Engineers. B, 2008Co-Authors: Hironori Horiguchi, Masaaki Sakagami, Yoshinobu Tsujimoto, Shinji Matsumoto, Shigeo TanakaAbstract:The effect of internal flow in symmetric and asymmetric micro Regenerative Pump impellers on their pressure performance was studied. It was found that the shut off head of the Pump with the symmetric impeller was about 2.5 times as that with the asymmetric impeller. The computation of the internal flow was performed to clarify the cause of the increase of the head. It was found that the contribution of the angular momentum supply was larger than that of shear stress for the head development for both cases. The larger head and momentum supply with the symmetric impeller were caused by larger recirculated flow rate and larger angular momentum difference between the inlet and outlet to the impeller. The larger recirculated flow rate was caused by smaller pressure gradient in the direction of recirculated flow. The decrease of the circumferential velocity in the casing was attributed to the smaller local flow rate in the casing.
