The Experts below are selected from a list of 195 Experts worldwide ranked by ideXlab platform
D. Miguel Medina Torres - One of the best experts on this subject based on the ideXlab platform.
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Pump Impeller Lifetime Improvement Through Visual Study Of Leading-Edge Cavitation
1998Co-Authors: Frank Visser, Jack J.m. Backx, Jan Geerts, Michael Cugal, D. Miguel Medina TorresAbstract:This paper describes the successful application of cavitation flow visualization to redesign the Impeller of an 81/2-MW (11,400 hp) high energy double suction single stage boiler feedpump. Dual purpose of the investigation was to develop an Impeller/pump case combination showing significantly less cavitation at the Impeller leading-edges than the original design, and realize specific rate objectives for meeting new duty points to eliminate high pressure throttling over the discharge valve. New Impeller designs were tested in a full scale model test pump running at reduced speed, which was equipped with an acrylic viewing window for direct observation of the Impeller blade cavitation. Elements of the experimental effort included determination of the effect of Impeller (Vane) design changes, along with the effect of suction box changes introduced at the splitter Vanes. Initially, a total of four alternative Impeller designs were considered, from which the potentially best design was selected and tuned to specification. The new Impeller design developed 109 PUMP Impeller LIFETIME IMPROVEMENT THROUGH VISUAL STUDY OF LEADING-EDGE CAVITATION
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Pump Impeller Lifetime Improvement Through Visual Study Of Leading-Edge Cavitation
1998Co-Authors: Frank Visser, Jack J.m. Backx, Jan Geerts, Michael Cugal, D. Miguel Medina TorresAbstract:This paper describes the successful application of cavitation flow visualization to redesign the Impeller of an 81/2-MW (11,400 hp) high energy double suction single stage boiler feedpump. Dual purpose of the investigation was to develop an Impeller/pump case combination showing significantly less cavitation at the Impeller leading-edges than the original design, and realize specific rate objectives for meeting new duty points to eliminate high pressure throttling over the discharge valve. New Impeller designs were tested in a full scale model test pump running at reduced speed, which was equipped with an acrylic viewing window for direct observation of the Impeller blade cavitation. Elements of the experimental effort included determination of the effect of Impeller (Vane) design changes, along with the effect of suction box changes introduced at the splitter Vanes. Initially, a total of four alternative Impeller designs were considered, from which the potentially best design was selected and tuned to specification. The new Impeller design developed 109 PUMP Impeller LIFETIME IMPROVEMENT THROUGH VISUAL STUDY OF LEADING-EDGE CAVITATION
Wang Le-qin - One of the best experts on this subject based on the ideXlab platform.
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Parameterization study on hydraulic performance of sanitary centrifugal pumps
Journal of Engineering Design, 2010Co-Authors: Wang Le-qinAbstract:To provide references for optimization design of the structure of flow passage components on sanitary centrifugal pumps,the numerical simulation of inner flow and parameterization analysis on the hydraulic performance of sanitary centrifugal pumps were carried out through CFD applications.The modeling method and simulation method on internal flow simulation were introduced.The distribution characteristics of the flow velocity and pressure in the pumps were analyzed,and the hydraulic performance of pumps was predicted based on the flow simulation.The simulation results agree well with the experimental results.The calculation results of the impact of the key structure parameters on the hydraulic performance of pumps indicate that the main parameters such as axial clearance of Impeller,Vane width and ratio of casing and Impeller size have their optimum values.The results provide valuable references for structure and performance improvement of sanitary centrifugal pumps.
Frank Visser - One of the best experts on this subject based on the ideXlab platform.
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Pump Impeller Lifetime Improvement Through Visual Study Of Leading-Edge Cavitation
1998Co-Authors: Frank Visser, Jack J.m. Backx, Jan Geerts, Michael Cugal, D. Miguel Medina TorresAbstract:This paper describes the successful application of cavitation flow visualization to redesign the Impeller of an 81/2-MW (11,400 hp) high energy double suction single stage boiler feedpump. Dual purpose of the investigation was to develop an Impeller/pump case combination showing significantly less cavitation at the Impeller leading-edges than the original design, and realize specific rate objectives for meeting new duty points to eliminate high pressure throttling over the discharge valve. New Impeller designs were tested in a full scale model test pump running at reduced speed, which was equipped with an acrylic viewing window for direct observation of the Impeller blade cavitation. Elements of the experimental effort included determination of the effect of Impeller (Vane) design changes, along with the effect of suction box changes introduced at the splitter Vanes. Initially, a total of four alternative Impeller designs were considered, from which the potentially best design was selected and tuned to specification. The new Impeller design developed 109 PUMP Impeller LIFETIME IMPROVEMENT THROUGH VISUAL STUDY OF LEADING-EDGE CAVITATION
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Pump Impeller Lifetime Improvement Through Visual Study Of Leading-Edge Cavitation
1998Co-Authors: Frank Visser, Jack J.m. Backx, Jan Geerts, Michael Cugal, D. Miguel Medina TorresAbstract:This paper describes the successful application of cavitation flow visualization to redesign the Impeller of an 81/2-MW (11,400 hp) high energy double suction single stage boiler feedpump. Dual purpose of the investigation was to develop an Impeller/pump case combination showing significantly less cavitation at the Impeller leading-edges than the original design, and realize specific rate objectives for meeting new duty points to eliminate high pressure throttling over the discharge valve. New Impeller designs were tested in a full scale model test pump running at reduced speed, which was equipped with an acrylic viewing window for direct observation of the Impeller blade cavitation. Elements of the experimental effort included determination of the effect of Impeller (Vane) design changes, along with the effect of suction box changes introduced at the splitter Vanes. Initially, a total of four alternative Impeller designs were considered, from which the potentially best design was selected and tuned to specification. The new Impeller design developed 109 PUMP Impeller LIFETIME IMPROVEMENT THROUGH VISUAL STUDY OF LEADING-EDGE CAVITATION
Shinichiro Takatani - One of the best experts on this subject based on the ideXlab platform.
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Magnetically suspended centrifugal blood pump with a radial magnetic driver
ASAIO Journal, 2005Co-Authors: Hideo Hoshi, Kiroyuki Katakoa, Jun Ichi Asama, Akira Shimokohbe, Katsuhiro Ohuchi, Tadahiko Shinshi, Shinichiro TakataniAbstract:A new magnetic bearing has been designed to achieve a low electronic power requirement and high stiffness. The magnetic bearing consists of 1) radial passive forces between the permanent magnet ring mounted inside the Impeller rotor and the electromagnet core materials in the pump casing and 2) radial active forces generated by the electromagnets using the two gap sensor signals. The magnetic bearing was assembled into a centrifugal rotary blood pump (CRBP) driven with a radial, magnetic coupled driver. The Impeller Vane shape was designed based upon the computational fluid dynamic simulation. The diameter and height of the CRBP were 75 mm and 50 mm, respectively. The magnetic bearing system required the power of 1.0-1.4 W. The radial Impeller movement was controlled to within +/- 10 microm. High stiffness in the noncontrolled axes, Z, phi, and theta, was obtained by the passive magnetic forces. The pump flow of 5 L/min against 100 mm Hg head pressure was obtained at 1,800 rpm with the electrical to hydraulic efficiency being greater than 15%. The Normalized Index of Hemolysis (NIH) of the magnetic bearing CRBP was one fifth of the BioPump BP-80 and one half of the NIKKISO HPM-15 after 4 hours. The newly designed magnetic bearing with two degrees of freedom control in combination with optimized Impeller Vane was successful in achieving an excellent hemolytic performance in comparison with the clinical centrifugal blood pumps.
Massimiliano Mura - One of the best experts on this subject based on the ideXlab platform.
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Theoretical model with experimental validation of a regenerative blower for hydrogen recirculation in a PEM fuel cell system
Energy Conversion and Management, 2010Co-Authors: Marco Badami, Massimiliano MuraAbstract:Abstract A theoretical model of a regenerative blower used for the hydrogen recirculation of a Proton Exchange Membrane (PEM) fuel cell (FC) for automotive applications has been implemented and validated by means of experimental data. A momentum exchange theory was used to determine the head-flow rate curves, whereas the circulatory flow rate was determined through a theory based on the consideration of the centrifugal force field in the side channel and in the Impeller Vane grooves. The model allows a good forecast to be made of the blower behaviour, and only needs its main geometrical characteristics and some fluid-dynamic data as input. For this reason, the model could be very interesting, especially during the first sizing and the design activity of the blower.
