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Journal articles on the topic 'Impeller configurations'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Ebrahimi, Tamer, Villegas, Chiappetta, and Ein-Mozaffari. "Application of CFD to Analyze the Hydrodynamic Behaviour of a Bioreactor with a Double Impeller." Processes 7, no. 10 (2019): 694. http://dx.doi.org/10.3390/pr7100694.

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Stirred bioreactors are commonly used unit operations in the pharmaceutical industry. In this study, computational fluid dynamics (CFD) was used in order to analyze the influence of the impeller configuration (Segment–Segment and Segment–Rushton impeller configurations) and the impeller rotational speed (an operational parameter) on the hydrodynamic behaviour and mixing performance of a bioreactor equipped with a double impeller. A relatively close agreement between the power values obtained from the CFD model and those measured experimentally was observed. Various parameters such as velocity

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2

Roberts, Douglas A., and Suresh C. Kacker. "Numerical Investigation of Tandem-Impeller Designs for a Gas Turbine Compressor." Journal of Turbomachinery 124, no. 1 (2001): 36–44. http://dx.doi.org/10.1115/1.1413472.

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The tandem-bladed impeller centrifugal compressor, which may offer potential aerodynamic benefits over conventional designs, is rarely employed in production gas turbine applications. Conventional impeller designs are often favored because of concerns for both significant performance losses and increased manufacturing costs associated with tandem configurations. In addition, much of the available literature concerning the characteristics of tandem-impellers is inconclusive, and at times contradictory. Because of the scarcity of tandem-impellers, rules for their design are nearly nonexistent. A

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3

Baun, Daniel O., and Ronald D. Flack. "Effects of Volute Design and Number of Impeller Blades on Lateral Impeller Forces and Hydraulic Performance." International Journal of Rotating Machinery 9, no. 2 (2003): 145–52. http://dx.doi.org/10.1155/s1023621x03000137.

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A comparison is made between the characteristics of the measured lateral impeller forces and the hydraulic performances of a four- and a five-vane impeller, each operating in a spiral volute, a concentric volute, and a double volute. The pump's rotor was supported in magnetic bearings. In addition to supporting and controlling the rotor motion, the magnetic bearings also served as active load cells and were used to measure the impeller forces acting on the pump's rotor. The lateral impeller force characteristics, as a function of a normalized flow coefficient, were virtually identical in the f

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4

Manshoor, Bukhari, Afifah Yusof, Suraya Laily, Izzuddin Zaman, and Amir Khalid. "An Effect of Fractal Baffles and Impellers with Double Stage 4-Blade Rushton Turbine to Fluid Flow Behaviour in Stirred Tank." Applied Mechanics and Materials 660 (October 2014): 816–22. http://dx.doi.org/10.4028/www.scientific.net/amm.660.816.

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The stirred tank is widely used in many industries to obtain the desired type of fluid mixing. In the context of mixing process, two different fluids and have a different properties will mix in a single equipment to produce another fluid with a new property. In this research, a new approach of stirred tank which is containing a new design of baffles and impellers was proposed for fluid mixing. The new design of baffles and impellers that proposed here are used a fractal pattern for both parts in the stirred tank. Implementing a fractal pattern for baffles and impellers in stirred tank believe

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5

Fořt, Ivan, Jiří Hájek, and Václav Machoň. "Energetic efficiency of two impellers on the same shaft in a cylindrical baffled vessel of high height/diameter ratio." Collection of Czechoslovak Chemical Communications 54, no. 9 (1989): 2345–56. http://dx.doi.org/10.1135/cccc19892345.

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The paper deals with the experimental study of the indicating particle circulation and the impeller power input in a liquid mechanically agitated with two high-speed impellers (combination of the standard turbine impeller and the six inclined (at 45°) plane blades impeller) on the same shaft in a slender vessel (its height is equal double of the vessel diameter) equipped with four radial baffles at its walls under the turbulent regime of agitated charge flow. By the visual method of the indicating particle it is examined its circulation in the lower part of the system pumping effect of the low

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6

Jirout, Tomáš. "Pumping Capacity of Pitched Blade Multi-Stage Impellers." Chemical and Process Engineering 35, no. 1 (2014): 47–53. http://dx.doi.org/10.2478/cpe-2014-0004.

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Abstract This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity

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7

Feng, Jianjun, Friedrich-Karl Benra, and Hans Josef Dohmen. "Numerical Investigation on Pressure Fluctuations for Different Configurations of Vaned Diffuser Pumps." International Journal of Rotating Machinery 2007 (2007): 1–10. http://dx.doi.org/10.1155/2007/34752.

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Numerical simulations on impeller-diffuser interactions in radial diffuser pumps are conducted to investigate the unsteady flow, and more attention is paid to pressure fluctuations on the blade and vane surfaces. Calculations are performed at different operating points, different blade number configurations, and different radial gaps between the impeller and diffuser to examine their effects on the unsteady flow. Computational results show that a jet-wake flow structure is observed at the impeller outlet. The biggest pressure fluctuation on the blade is found to occur at the impeller trailing

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8

Li, Ziliang, Xingen Lu, Ge Han, Yanfeng Zhang, Shengfeng Zhao, and Junqiang Zhu. "The performance of a centrifugal compressor with a tandem impeller in off-design conditions." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 2 (2019): 156–72. http://dx.doi.org/10.1177/0957650919848614.

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Centrifugal compressors often suffer relatively low efficiency and a terrible operating range particularly due to the complex flow structure and intense impeller/diffuser interaction. Numerous studies have focused on improving the centrifugal compressor performance using many innovative ideas, such as the tandem impeller, which has become increasingly attractive due to its ability to achieve the flow control with no additional air supply configurations and control costs in compressor. However, few studies that attempted to the investigation of tandem impeller have been published until now and

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9

Chomiuk, Bartłomiej, and Janusz Skrzypacz. "Comparison of energy parameters of a centrifugal pump with a multi-piped impeller in cooperation either with an annular channel and a spiral channel." Open Engineering 8, no. 1 (2018): 513–22. http://dx.doi.org/10.1515/eng-2018-0063.

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Abstract The article presents results of numerical analyzes, which raise a subject of influence of the cooperation the multi-piped impeller with a rationalized flow geometry of annular casing and volute casing for liquid flow through centrifugal pump and their operating parameters in the extremely low specific speed nq<10. The multi-piped impeller (patented by authors) is a major alternative to classic vane impellers. The stator type is responsible for the conversion of the kinetic energy of the liquid by the impeller outlet into potential energy, which determines the overall efficiency of

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10

Li, Ziliang, Xingen Lu, Yanfeng Zhang, Ge Han, Chengwu Yang, and Shengfeng Zhao. "Numerical investigation of a highly loaded centrifugal compressor stage with a tandem bladed impeller." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 3 (2017): 240–53. http://dx.doi.org/10.1177/0957650917725406.

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This study numerically investigated a highly loaded centrifugal compressor stage with various tandem-designed impellers and a wedge diffuser using a state-of-the-art multi-block flow solver to better understand the fundamental mechanism of tandem impellers. The flow topologies in the impeller are analyzed in detail to identify the underlying physical mechanism of the effect of the tandem-impeller design on the performance of the compressor stage. Particular emphasis is placed on the evolution of the flow structure in the tandem bladed impeller by varying the inducer–exducer clocking arrangemen

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11

Adel, Mohamed, Mohamed R. Shaalan, Radwan M. Kamal, and Diaa S. El Monayeri. "A comparative study of impeller aerators configurations." Alexandria Engineering Journal 58, no. 4 (2019): 1431–38. http://dx.doi.org/10.1016/j.aej.2019.11.014.

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12

Beaudoin, R. J., S. M. Miner, and R. D. Flack. "Laser Velocimeter Measurements in a Centrifugal Pump With a Synchronously Orbiting Impeller." Journal of Turbomachinery 114, no. 2 (1992): 340–49. http://dx.doi.org/10.1115/1.2929148.

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Velocity profiles were measured in the impeller of a centrifugal pump with a two-directional laser velocimeter. Blade-to-blade profiles were measured at four circumferential positions and four radii within and one outside the four-bladed impeller. Data are presented herein at two circumferential and three radial locations. The pump was tested in two configurations; with the impeller running centered within the pump, and with the impeller orbiting with a synchronous motion (ε/r2 = 0.016). Variation in velocity profiles among the individual passages in the orbiting impeller were found. At design

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13

Jirout, Tomáš, and Dita Jiroutová. "Application of Theoretical and Experimental Findings for Optimization of Mixing Processes and Equipment." Processes 8, no. 8 (2020): 955. http://dx.doi.org/10.3390/pr8080955.

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The homogenization of the agitated batch and ensuring the suspension of particles are the most frequently encountered requirements in terms of mixing applications. These operations are affected by the flow of the agitated batch. The geometrical parameters of the mixing system, especially the shape of the agitator blade, affect flow and circulation in the agitated batch. The present work provides a general description of the most common processes in the agitated batch (blending and particle suspension), hydrodynamic parameters (flow in agitated batches, pumping and circulation capacity of impel

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14

Balemans, Sophie, Siegfried E. Vlaeminck, Elena Torfs, et al. "The Impact of Local Hydrodynamics on High-Rate Activated Sludge Flocculation in Laboratory and Full-Scale Reactors." Processes 8, no. 2 (2020): 131. http://dx.doi.org/10.3390/pr8020131.

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High rate activated sludge (HRAS) processes have a high potential for carbon and energy recovery from sewage, yet they suffer frequently from poor settleability due to flocculation issues. The process of flocculation is generally optimized using jar tests. However, detailed jar hydrodynamics are often unknown, and average quantities are used, which can significantly differ from the local conditions. The presented work combined experimental and numerical data to investigate the impact of local hydrodynamics on HRAS flocculation for two different jar test configurations (i.e., radial vs. axial i

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15

Checcucci, Matteo, Federica Sazzini, Michele Marconcini, et al. "Assessment of a Neural-Network-Based Optimization Tool: A Low Specific-Speed Impeller Application." International Journal of Rotating Machinery 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/817547.

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This work provides a detailed description of the fluid dynamic design of a low specific-speed industrial pump centrifugal impeller. The main goal is to guarantee a certain value of the specific-speed number at the design flow rate, while satisfying geometrical constraints and industrial feasibility. The design procedure relies on a modern optimization technique such as an Artificial-Neural-Network-based approach (ANN). The impeller geometry is parameterized in order to allow geometrical variations over a large design space. The computational framework suitable for pump optimization is based on

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16

Engeda, Abraham, Yunbae Kim, Ronald Aungier, and Gregory Direnzi. "The Inlet Flow Structure of a Centrifugal Compressor Stage and Its Influence on the Compressor Performance." Journal of Fluids Engineering 125, no. 5 (2003): 779–85. http://dx.doi.org/10.1115/1.1601255.

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The performance of centrifugal compressors can be seriously degraded by inlet flow distortions that result from an unsatisfactory inlet configuration. In this present work, the flow is numerically simulated and the flow details are analyzed and discussed in order to understand the performance behavior of the compressor exposed to different inlet configurations. In a previous work, complementary to this present work, experimental tests were carried out for the comparison of a centrifugal compressor stage performance with two different inlet configurations: one of which was a straight pipe with

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17

Ishida, M., H. Ueki, and Y. Senoo. "Effect of Blade Tip Configuration on Tip Clearance Loss of a Centrifugal Impeller." Journal of Turbomachinery 112, no. 1 (1990): 14–18. http://dx.doi.org/10.1115/1.2927412.

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According to the theory presented by the authors, the tip clearance loss of an un-shrouded centrifugal impeller mainly consists of two kinds of loss; one is the drag due to the leakage flow through the blade tip clearance and the other is the pressure loss to support the fluid in the thin annular clearance space between the shroud and the blade tip against the pressure gradient in the meridional plane without blades. The former is proportional to the leakage flow or the contraction coefficient of leakage flow. The authors have conducted performance tests using an impeller with 16 backward-lean

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18

Abed, Cheikh Brahim, Sofiane Khelladi, Michael Deligant, Abdellatif El Marjani, Moisés Solis, and Farid Bakir. "Experimental Validation of the Aerodynamic Performance of an Innovative Counter-Rotating Centrifugal Compressor." Energies 14, no. 9 (2021): 2582. http://dx.doi.org/10.3390/en14092582.

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Turbomachinery with double counter-rotating impellers offers more degrees of freedom in the choice of design and control parameters compared to conventional machines. For these innovative machines, the literature review shows that more publications concerning axial type turbomachines are available than centrifugal ones. This work deals with a design and experimental performance analysis, applied to two counter-rotating impellers of a centrifugal compressor “CRCC”. CRCC was designed with a specifically developed tool based on mean-line approach coupled with optimization algorithms and a stream-

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19

Offtinger, C., C. Henry, R. Morel, and F. Spettel. "Experimental Comparison of Flow Fields at the Inlet and the Outlet of an Inducer With Shrouded and Unshrouded Configurations." Journal of Fluids Engineering 119, no. 4 (1997): 954–59. http://dx.doi.org/10.1115/1.2819523.

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The flow field was measured near the inlet and the outlet of an axial flow inducer with shrouded and unshrouded configurations combined with a centrifugal pump. Investigations were conducted using a five-hole probe for several flow rates. The shroud induces a counterrotating flow at the inlet and a blockage effect at the outlet in the region of the tip and for all flow rates. The radial distribution of losses keeps the same shape in both configurations, however, the loss level is higher with the shroud, giving a lower efficiency for the combined inducer-impeller configuration. Effects of shrou

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20

Akin, O., and D. Rockwell. "Actively Controlled Radial Flow Pumping System: Manipulation of Spectral Content of Wakes and Wake-Blade Interactions." Journal of Fluids Engineering 116, no. 3 (1994): 528–37. http://dx.doi.org/10.1115/1.2910309.

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A unique, actively controlled pumping system allows independent control of inflow and impeller perturbations, as well as the phase shift between them. The basic configurations of an impeller and an impeller-diffuser blade system have been investigated, with the objective of manipulating the spectral content of the unsteadiness of the near-wake at the impeller discharge. Substantial alteration of the discrete spectral components can be attained. A central feature is the generation of a number of nonlinear interaction components, corresponding to sum and difference frequencies, of the forcing- a

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21

Guleren, KM. "Automatic optimization of a centrifugal pump based on impeller–diffuser interaction." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 8 (2018): 1004–18. http://dx.doi.org/10.1177/0957650918766688.

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In this study, a centrifugal pump has been optimized using the genetic algorithm coupled with computational fluid dynamics considering the flow physics for various impeller–diffuser configurations. During the automatic optimization process, the population was selected from a pool of pump geometries generated by four design variables; namely the relative diffuser vane angle, number of diffuser vanes, number of impeller blades, and the impeller wrap angle. The genetic algorithm was combined with a flow solver and a computer aided design software which was used also to create the mesh for the gen

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22

Blanchard, Danny, Phil Ligrani, and Bruce Gale. "Performance and Development of a Miniature Rotary Shaft Pump." Journal of Fluids Engineering 127, no. 4 (2005): 752–60. http://dx.doi.org/10.1115/1.1949641.

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The development and performance of a novel miniature pump called the rotary shaft pump (RSP) is described. The impeller is made by boring a 1.168 mm hole in one end of a 2.38 mm dia shaft and cutting slots in the side of the shaft at the bottom of the bored hole such that the metal between the slots defines the impeller blades. The impeller blades and slots are 0.38 mm tall. Several impeller designs are tested over a range of operating conditions. Pump performance characteristics, including pressure rise, hydraulic efficiency, slip factor, and flow rate, are presented for several different pum

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23

Chomiuk, Bartłomiej, and Janusz Skrzypacz. "Analysis of the influence of a stator type modification on the performance of a pump with a hole impeller." Open Engineering 9, no. 1 (2019): 218–28. http://dx.doi.org/10.1515/eng-2019-0029.

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AbstractThe article presents the results of numerical analyses and experimental research of the influence of various types of stators on a liquid flow through a centrifugal pump with a hole impeller. It is a continuation of authors research of cooperation pump stators with alternative types of impellers which work in ultra low specific speed. Hole impellers have become a significant alternative to classical ones in a range of extremely low specific speed nq<10. The aim of the research is to verify the quality as well as quantity of computer modeling results, and to estimate accuracy by exam

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24

Laidoudi, Houssem. "HYDRODYNAMIC ANALYSES OF THE FLOW PATTERNS IN STIRRED VESSEL OF TWO-BLADED IMPELLER." Journal of the Serbian Society for Computational Mechanics 14, no. 2 (2020): 117–32. http://dx.doi.org/10.24874/jsscm.2020.14.02.08.

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In this paper, the governing equations of continuity and momentum subjected to suitable boundary conditions have been solved numerically to investigate the fluid flow in stirred vessel of two-bladed impeller. The numerical simulations have been carried out in three-dimensions for laminar flow. The studied fluid was considered Newtonian and incompressible. Our research studied the effects of geometrical configurations of the two-bladed impeller and its rotational speed on fluid patterns and mechanical power consumption. The innovative point in this paper is that the blades of the impeller conta

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25

Ahmed, Shahriar. "Visualization Study on Hemolysis in Centrifugal Blood Pumps with Different Impeller Configurations." Journal of Life Support Engineering 12, no. 1 (2000): 23–26. http://dx.doi.org/10.5136/lifesupport.12.23.

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26

Wang, Tao, Gengzhi Yu, Yumei Yong, Chao Yang, and Zai-Sha Mao. "Hydrodynamic Characteristics of Dual-Impeller Configurations in a Multiple-Phase Stirred Tank." Industrial & Engineering Chemistry Research 49, no. 3 (2010): 1001–9. http://dx.doi.org/10.1021/ie9006886.

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27

Dai, Y., A. Engeda, M. Cave, and J.-L. Di Liberti. "A flow field study of the interaction between a centrifugal compressor impeller and two different volutes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 2 (2010): 345–56. http://dx.doi.org/10.1243/09544062jmes1522.

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The interaction between an impeller with one large and one small overhung volute was investigated by both computational fluid dynamics simulation and experimental methods. The large volute was mainly generated by increasing the small volute axial length. The computational model, with k—∊ turbulence model and wall function, has been used to predict the internal flow of both volutes. The effect of volute tongue on the flow in the impeller was analysed at off-design conditions. The flow structure in the volutes was also investigated in detail. The performance test of the two configurations was ca

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28

Flack, R. D., S. M. Miner, and R. J. Beaudoin. "Turbulence Measurements in a Centrifugal Pump With a Synchronously Orbiting Impeller." Journal of Turbomachinery 114, no. 2 (1992): 350–58. http://dx.doi.org/10.1115/1.2929149.

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Turbulence profiles were measured in a centrifugal pump with an impeller with backswept blades using a two-directional laser velocimeter. Data presented include radial, tangential, and cross product Reynolds stresses. Blade-to-blade profiles were measured at four circumferential positions and four radii within and one radius outside the four-bladed impeller. The pump was tested in two configurations: with the impeller running centered within the volute, and with the impeller orbiting with a synchronous motion (ε/r2 = 0.016). Flow rates ranged from 40 to 106 percent of the design flow rate. Var

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29

Maier, Raluca, Sebastian Vintila, Radu Mihalache, Valeriu Vilag, Mihail Sima, and Valeriu Dragan. "Decreasing the Mass of Turbomachinery Subansamblies Using Advanced Polymer Composites." Materiale Plastice 56, no. 4 (2019): 687–92. http://dx.doi.org/10.37358/mp.19.4.5254.

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The extension of use of light advanced polymer composites from structural parts of an aircraft to all kinds of components of the engine is presently very limited by the knowledge of both technological development process and materials behaviour during service. The paper comes to meet an area of interest for many researchers and large integrators and manufacturers, by presenting the first steps made into the manufacturing of a carbon fiber reinforced composite blades for a centrifugal compressor impeller. An existing metallic reference impeller was redesigned, air flow studies were achieved to

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30

Allen, Jacob C., and Phillip M. Ligrani. "Optimization of an Innovative Rotary Shaft Pump (RSP)." Journal of Fluids Engineering 128, no. 6 (2006): 1281–88. http://dx.doi.org/10.1115/1.2353273.

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This paper describes the optimization of rotary shaft pump performance, which is accomplished by comparing the performance of four different centrifugal rotary pump configurations: hooked blades pump, backward-curved blades ID=12.7mm pump, contoured base pump, and backward-curved blades ID=19.1mm pump. Each of these devices utilizes a unique and simple impeller design where the blades are directly integrated into a shaft with an outer diameter of 25.4mm. Presented for each pump are performance data including volumetric flow rate, pump head, and hydraulic efficiency. When pumping water, the mos

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31

Guelich, J. F., and U. Bolleter. "Pressure Pulsations in Centrifugal Pumps." Journal of Vibration and Acoustics 114, no. 2 (1992): 272–79. http://dx.doi.org/10.1115/1.2930257.

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Pressure pulsations in centrifugal pumps are created by the wake flow from the impeller blade trailing edge and by large-scale turbulence and vortices generated by flow separation and flow recirculation at part load. The physical mechanisms causing pressure pulsations and the design parameters having an influence on the level of the pressure pulsations are reviewed. The system in which a pump is operated has a strong impact on the level of pressure pulsations measured, which also depends on the detailed design of the impeller and the diffuser. These effects cannot be predicted theoretically. T

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32

Schleer, M., S. S. Hong, M. Zangeneh, et al. "Investigation of an Inversely Designed Centrifugal Compressor Stage—Part II: Experimental Investigations." Journal of Turbomachinery 126, no. 1 (2004): 82–90. http://dx.doi.org/10.1115/1.1625690.

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This paper presents an experimental investigation of two centrifugal compressor stage configurations. The baseline configuration has been designed using conventional design engineering tools. The second configuration was designed using advanced inverse design rules as described in Part I. It is designed to match the choke flow as well as the best point of the conventionally designed stage. The experimental investigation is conducted in the industry-scale centrifugal compressor facility at the Turbomachinery Laboratory of the Swiss Federal Institute of Technology. Performance maps for both conf

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33

Hernando, Miguel, Virgilio Gómez, Alberto Brunete, and Ernesto Gambao. "CFD Modelling and Optimization Procedure of an Adhesive System for a Modular Climbing Robot." Sensors 21, no. 4 (2021): 1117. http://dx.doi.org/10.3390/s21041117.

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Adhesion systems are very important in robots for infrastructure inspection (especially in vertical walls). They present the challenge of optimizing the ratio vacuum/power consumption in battery-powered robots. In this paper, a CFD (computer fluid dynamics) modelling and optimization process of a robot adhesion system is carried out to determine the best performing configuration in terms of vacuum and power consumption. Analytical and numerical models were developed to predict the behaviour of the system for different configurations. The models were validated, using test rig measurements, by c

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34

Ebrahimi, Mohammadreza, Amirsalar Yaraghi, Farhad Ein-Mozaffari, and Ali Lohi. "The effect of impeller configurations on particle mixing in an agitated paddle mixer." Powder Technology 332 (June 2018): 158–70. http://dx.doi.org/10.1016/j.powtec.2018.03.061.

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35

Baun, D. O., and R. D. Flack. "A Plexiglas Research Pump With Calibrated Magnetic Bearings/Load Cells for Radial and Axial Hydraulic Force Measurement." Journal of Fluids Engineering 121, no. 1 (1999): 126–32. http://dx.doi.org/10.1115/1.2821992.

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A research pump intended for both flow visualization studies and direct measurement of hydrodynamic radial and axial forces has been developed. The impeller and the volute casing are constructed from Plexiglas which facilitates optical access for laser velocimetry measurements of the flow field both inside the impeller and in the volute casing. The pump housing is designed for flexibility allowing for each interchange of impellers and volute configurations. The pump rotor is supported by three radial magnetic bearings and one double acting magnetic thrust bearing. The magnetic bearings have be

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36

Solis, Moisés, Farid Bakir, Sofiane Khelladi, and Ricardo Noguera. "Numerical Study on Pressure Fluctuations Reduction in Centrifugal Pumps: Influence of Radial Gap and Splitter Blades." ISRN Mechanical Engineering 2011 (October 13, 2011): 1–14. http://dx.doi.org/10.5402/2011/479594.

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Numerical study was carried out in four centrifugal pumps to analyze the effects of adding splitters and incrementing the radial gap in order to decrease the pressure fluctuations at the blade passage frequency. It is well known that in this kind of pump, the interactions between the flow leaving the impeller and entering the volute generate fluctuating pressures which propagate toward the inlet and the discharge of the pump. These pulsations are mainly associated to the blade passage frequency presenting high amplitudes near the volute tongue and at impeller discharge. Four configurations wer

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37

Zhao, Xinwei, Hongkun Li, Shuhua Yang, Zhenfang Fan, and Yang Wang. "Experimental determination of IGV preswirl effect on impeller blade vibration in an unshrouded centrifugal compressor." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 235, no. 6 (2021): 1288–301. http://dx.doi.org/10.1177/09576509211024766.

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The unshrouded impeller is widely used in industrial centrifugal compressors and normally operates at high tip speed and large volume flow. However, this type of impeller can be very sensitive to flow excitations such as IGV wake, and hence encounters the challenge of high dynamic stress. Due to the lack of experimental vibration data, this paper aims to enhance the understanding of the IGV preswirl effect. The real operating representative data from strain gauges is acquired during the experiment. The blade transient and quasi-steady response due to upstream IGV wake under different configura

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38

Pieruszka, Adam, Tomasz Siwek, Wojciech Kalawa, Łukasz Lis, Sebastian Stefański, and Karol Sztekler. "The effect of blade slots on flow behaviour in a fan impeller." EPJ Web of Conferences 213 (2019): 02067. http://dx.doi.org/10.1051/epjconf/201921302067.

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The use of blade slots is one of the passive methods of controlling flow in a fan impeller. Numerical CFD analyses indicate a possibility of controlling the point of flow separation in the inter-blade space depending on various configurations of the aperture arrangement. Bench studies confirm the possibility of changing the increase of total pressure and internal efficiency. Additionally, the changes affect the noise level during fan operation.

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Chen, Xin, Shiyang Li, Dazhuan Wu, Shuai Yang, and Peng Wu. "Effect of Suction and Discharge Conditions on the Unsteady Flow Phenomena of Axial-Flow Reactor Coolant Pump." Energies 13, no. 7 (2020): 1592. http://dx.doi.org/10.3390/en13071592.

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In order to study the effects of the suction and discharge conditions on the hydraulic performance and unsteady flow phenomena of an axial-flow reactor coolant pump (RCP), three RCP models with different suction and discharge configurations are analyzed by computational fluid dynamics (CFD) method. The CFD results are validated by experimental data. The hydraulic performance of the three RCP models shows little difference. However, the unsteady flow phenomena of RCP are significantly affected by the variation of suction and discharge conditions. Compared with that of Model E-S (baseline, elbow

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Haupt, U., M. Rautenberg, and A. N. Abdel-Hamid. "Blade Excitation by Broad-Band Pressure Fluctuations in a Centrifugal Compressor." Journal of Turbomachinery 110, no. 1 (1988): 129–37. http://dx.doi.org/10.1115/1.3262158.

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The mechanism of blade excitation during the operation of a high-mass-flow, high-pressure-ratio centrifugal compressor has been investigated. This was carried out in the compressor operating range below 60 percent of design speed and in the zone of unsteady flow occurrence, where considerable blade vibration has been measured but no periodic unsteady pressure pattern such as rotating stall could be identified. Experiments conducted to study the mechanism of interactions between flow and blades were accomplished using several measuring methods simultaneously, such as measurements of blade vibra

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Zhao, Xiaoyan, Lujing Ren, Dongsheng Guo, Wenjia Wu, Xiaojun Ji, and He Huang. "CFD investigation of Schizochytrium sp. impeller configurations on cell growth and docosahexaenoic acid synthesis." Bioprocess and Biosystems Engineering 39, no. 8 (2016): 1297–304. http://dx.doi.org/10.1007/s00449-016-1608-7.

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Ramírez, Luis A., Edwar L. Pérez, Cesar García Díaz, Dumar Andrés Camacho Luengas, Nicolas Ratkovich, and Luis H. Reyes. "CFD and Experimental Characterization of a Bioreactor: Analysis via Power Curve, Flow Patterns and k L a." Processes 8, no. 7 (2020): 878. http://dx.doi.org/10.3390/pr8070878.

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Mixing operations in biological processes is of utmost importance due to its effect on scaling-up and heat and mass transfer. This paper presents the characterization of a bench-top bioreactor with different impeller configurations, agitation and oxygen transfer rates, using CFD simulations and experimental procedures. Here, it is demonstrated that factors such as the type of impeller and the flow regime can drastically vary the operation as in the preparation of cultures. It was observed that the bioreactor equipped with a Rushton generates a k L a of 0.0056 s−1 for an agitation velocity and

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Raman, Senthil, and Heuy Kim. "Computational Analysis of the Performance Characteristics of a Supercritical CO2 Centrifugal Compressor." Computation 6, no. 4 (2018): 54. http://dx.doi.org/10.3390/computation6040054.

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A centrifugal compressor working with supercritical CO 2 (S-CO 2 ) has several advantages over other supercritical and conventional compressors. S-CO 2 is as dense as the liquid CO 2 and becomes difficult to compress. Thus, during the operation, the S-CO 2 centrifugal compressor requires lesser compression work than the gaseous CO 2 . The performance of S-CO 2 compressors is highly varying with tip clearance and vanes in the diffuser. To improve the performance of the S-CO 2 centrifugal compressor, knowledge about the influence of individual components on the performance characteristics is nec

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Dovydas, Rimdžius, Bielskus Juozas, Martinaitis Vytautas, Motuzienė Violeta, and Streckienė Giedrė. "Experimental Evaluation of Turbine Ventilators Performance under Different Test Conditions." E3S Web of Conferences 64 (2018): 07003. http://dx.doi.org/10.1051/e3sconf/20186407003.

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One of the most popular wind driven ventilation devices is a turbine ventilator. Its main construction components usually are air suction duct and impeller. However, there are many different configurations of such devices – different shape of vanes and ratios between main dimensions. In order to develop turbine ventilators there is demand for deeper fundamental researches. Major part of previous experimental investigations compares turbine ventilators performance. The aim of presented experimental investigation is to understand key parameters affecting wind driven ventilators performance. For

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Ferrara, Giovanni, Lorenzo Ferrari, and Leonardo Baldassarre. "Rotating Stall in Centrifugal Compressor Vaneless Diffuser: Experimental Analysis of Geometrical Parameters Influence on Phenomenon Evolution." International Journal of Rotating Machinery 10, no. 6 (2004): 433–42. http://dx.doi.org/10.1155/s1023621x04000430.

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The rotating stall is a key problem for achieving a good working range of a centrifugal compressor and a detailed understanding of the phenomenon is very important to anticipate and avoid it. Many experimental tests have been planned by the authors to investigate the influence on stall behavior of different geometrical configurations. A stage with a backward channel upstream, a 2-D impeller with a vaneless diffuser and a constant cross-section volute downstream, constitute the basic configuration. Several diffuser types with different widths, pinch shapes, and diffusion ratios were tested. The

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Zhang, Jie, Hai Wei Ye, Kang Wen Li, Gang Wang, and Feng Li. "Numerical Simulation of Mold Filling Process for Wax Pattern of the Impeller in Investment Casting." Applied Mechanics and Materials 80-81 (July 2011): 965–68. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.965.

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This paper try to analyze the rheological behavior during the wax injection, and build a mathematical model to simulate the wax injection process. By using Moldflow, simulate a wax pattern with different ingate configurations to optimize the injection modeling product design. This study helps to improve the model design quality, shorten the development cycles, lower down the overall cost and enhanced competition in market.

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Martelli, F., S. Pazzi, and V. Michelassi. "Automatic computational fluid dynamics-based procedure for the optimization of a centrifugal impeller." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 219, no. 7 (2005): 549–57. http://dx.doi.org/10.1243/095765005x31261.

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A typical centrifugal impeller characterized by a low flow coefficient and cylindrical blades is redesigned by means of an intelligent automatic search program. The procedure consists of a feasible sequential quadratic programming algorithm (Fletcher, R. Practical Methods of optimization, 2000 (Wiley)) coupled to a lazy learning (LL) interpolator 1 to speed-up the process. The program is able to handle geometric constraints to reduce the computational effort devoted to the analysis of non-physical configurations. The objective function evaluator is an in-house developed structured computationa

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Ungerman, Andrew J., and Theodore J. Heindel. "Carbon Monoxide Mass Transfer for Syngas Fermentation in a Stirred Tank Reactor with Dual Impeller Configurations." Biotechnology Progress 23, no. 3 (2008): 613–20. http://dx.doi.org/10.1021/bp060311z.

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Pan, Ao, Minghui Xie, Jianye Xia, Ju Chu, and Yingping Zhuang. "Gas-liquid mass transfer studies: The influence of single- and double-impeller configurations in stirred tanks." Korean Journal of Chemical Engineering 35, no. 1 (2017): 61–72. http://dx.doi.org/10.1007/s11814-017-0266-z.

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Moucha, Tomáš, Václav Linek, and Eva Prokopová. "Gas hold-up, mixing time and gas–liquid volumetric mass transfer coefficient of various multiple-impeller configurations: Rushton turbine, pitched blade and techmix impeller and their combinations." Chemical Engineering Science 58, no. 9 (2003): 1839–46. http://dx.doi.org/10.1016/s0009-2509(02)00682-6.

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