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Journal articles on the topic 'Tandem impeller'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

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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2

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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3

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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4

Балалаев, Антон Валерьевич, Екатерина Викторовна Балалаева та Юрий Юрьевич Терещенко. "Моделювання течії в дворядному вентиляторі турбореактивного двоконтурного двигуна". Aerospace technic and technology, № 4sup1 (27 серпня 2021): 19–24. http://dx.doi.org/10.32620/aktt.2021.4sup1.03.

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Modern trends in the global aircraft industry are prompting aircraft engine engineers to create and develop various methods to improve the aerodynamic characteristics of turbomachines. The urgent need to improve the efficiency of new generation engines leads to a rapid increase in the bypass ratio of engines, which requires the development of fans with large diametrical dimensions and high aerodynamic perfection. Boundary layer control in turbomachines using tandem blade rows is one of the most promising ways to improve the aerodynamic characteristics of aircraft engine fans with a high bypass

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5

Huang, Jun, Fengchuan Zheng, Yuhu Wang, Tairan Chen, and Yana Wang. "Study on the transient cavitation characteristics in an axial flow tandem pump during the rapid starting period." Journal of Physics: Conference Series 2854, no. 1 (2024): 012034. http://dx.doi.org/10.1088/1742-6596/2854/1/012034.

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Abstract In axial flow pump systems constrained by limited internal space, the advantages of axial flow tandem pumps are high space utilization, strong power capacity, and great thrust. The onset of cavitation during the rapid starting period poses a classic issue for tandem axial flow pumps, resulting in issues like noise, vibration, cavitation breakdown, and material damage. This article aims to investigate the transient cavitation characteristics of each flow passage component of an axial flow tandem pump during the rapid starting period by numerical simulation method. It is compared that t

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6

Shi, Xiaobing, Jinling Lu, and Lianming Zhao. "Investigations on the influence of tandem blades on inner flow and performance characteristics of centrifugal pump." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 234, no. 1 (2019): 46–55. http://dx.doi.org/10.1177/0954408919883730.

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Although significant advances have been made in tandem-blade technology for axial and centrifugal compressors, little attention has been paid to its application in centrifugal pumps. In this study, we propose a new tandem-blade design method for improving inner flow characteristics and overall performance of a centrifugal pump. With the SST k − ω turbulence model, three-dimensional turbulent flow fields in the centrifugal pump with tandem blades are simulated and analyzed. The effects of tandem blades on the inner flow and performance characteristics of the centrifugal pump are investigated. T

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7

Li, Ziliang, Yanhui Wu, and Xingen Lu. "Performance Improvement of a Highly Loaded Transonic Centrifugal Compressor with Tandem Impeller and Freeform Blade Configuration." Energies 15, no. 24 (2022): 9283. http://dx.doi.org/10.3390/en15249283.

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A highly loaded transonic centrifugal compressor is aerodynamically designed and numerically investigated. The objectives are to improve the compressor efficiency by using tandem impeller configuration and 3D free-formed blade design concepts. This approach has the potential to control both the transonic and distorted flows within impeller passages. The results suggest that employing the tandem impeller configuration can significantly improve the compressor efficiency by 1.4%. The efficiency gain is mainly contributed by the improved uniformity of the impeller discharge flow achieved when the

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8

Stuparu, Adrian, Romeo Susan-Resiga, and Alin Bosioc. "Improving the Homogenization of the Liquid-Solid Mixture Using a Tandem of Impellers in a Baffled Industrial Reactor." Applied Sciences 11, no. 12 (2021): 5492. http://dx.doi.org/10.3390/app11125492.

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The paper explores a tandem configuration of three-blade impellers in a stirred reactor. The working fluid is a liquid-solid mixture and the stirring mechanism fitted with the two impellers must prevent the sedimentation of solid particles while homogenously dispersing them in the bulk liquid. The present numerical investigation, performed with the expert software Ansys® Fluent, Release 16, employs the Eulerian multiphase model along with the RNG k–ε turbulence model to simulate the free-surface liquid–solid flows in the baffled stirred reactor. A sliding mesh approach is used to model the imp

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9

Josuhn-Kadner, B., and B. Hoffmann. "Investigations on a Radial Compressor Tandem-Rotor Stage With Adjustable Geometry." Journal of Turbomachinery 115, no. 3 (1993): 552–59. http://dx.doi.org/10.1115/1.2929289.

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A radial compressor stage has been investigated mainly experimentally for aerodynamic stage optimization. The rotor (πt = 3.9) consists of a profiled axial inducer and a conventionally designed radial impeller. Inducer and impeller can be locked at different circumferential positions relative to each other, thus forming a tandem wheel with adjustable geometry. Conventional and Laser-2-Focus system measurements for the tandem rotor and the stage were performed at different operating points to study the influence of the circumferential clearance geometry between inducer and impeller with respect

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10

Doroshenko, E. V., Yu M. Tereshchenko, Yu Yu Tereshchenko, and A. O. Kushchinskiy. "Aeroacoustic characteristics of the axial compressor stage with tandem impeller." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 1 (February 2019): 48–54. http://dx.doi.org/10.29202/nvngu/2019-1/9.

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11

Wu, Zhijian, Chenhao Li, Xingqi Luo, Guojun Zhu, and Like Wang. "Study on pressure fluctuation characteristics of the mixed-flow pump with the tandem misaligned blade structure." Journal of Physics: Conference Series 2854, no. 1 (2024): 012013. http://dx.doi.org/10.1088/1742-6596/2854/1/012013.

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Abstract As supporting equipment for deep-sea oil and gas resource exploitation, how to improve the transmission performance and stability of the impeller of the mixed-flow pump (MFP) has become a key technical problem. This paper focuses on studying the impeller blade of the MFP. Based on the blade optimization technology, four different tandem misaligned blade (TMB) angle schemes of α=0°,15°,45°,75° are proposed. The SST k-ω turbulence model is used to simulate the different blade angles under the pure liquid condition. The pressure pulsation of the MFP and the blade load distribution are st

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12

Ju, Y. P., and C. H. Zhang. "Design Optimization and Experimental Study of Tandem Impeller for Centrifugal Compressor." Journal of Propulsion and Power 30, no. 6 (2014): 1490–501. http://dx.doi.org/10.2514/1.b34933.

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13

LI, Ziliang, Xin'gen LU, Shengfeng ZHAO, Ge HAN, Chengwu YANG, and Yanfeng ZHANG. "Numerical investigation of flow mechanisms of tandem impeller inside a centrifugal compressor." Chinese Journal of Aeronautics 32, no. 12 (2019): 2627–40. http://dx.doi.org/10.1016/j.cja.2019.07.012.

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14

Li, Ziliang, Ge Han, Xingen Lu, Enliang Huang, and Shengfeng Zhao. "Improving the operating range using a centrifugal compressor with a tandem impeller." Aerospace Science and Technology 96 (January 2020): 105548. http://dx.doi.org/10.1016/j.ast.2019.105548.

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15

Yudhistira, Juan Prima, Muhammad Umbara, Meysha Namira, et al. "MISS ALIGNMENT POMPA 42-P-301 A TANDHEM SEAL PADA AREA OIL MOVEMENT PT. XYZ." Perwira Journal of Science & Engineering 5, no. 1 (2025): 161–64. https://doi.org/10.54199/pjse.v5i1.332.

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Pompa merupakan mesin yang berfungsi untuk menaikkan tekanan fluida. Dengan naiknya tekanan fluida maka fluida dapat dipindahkan dari satu tempat ke tempat lain atau untuk menaikkan fluida dari level yang rendah ke level yang lebih tinggi. Penelitian ini bertujuan untuk menganalisis dan memperbaiki masalah pada pompa 42-P-301 A Tandem Seal di area Oil Movement yang mengalami ketidaksesuaian (missalignment). Metode analisis termasuk pengumpulan data, wawancara, dan pemantauan kondisi peralatan. Hasil penelitian menunjukkan bahwa Penurunan efisiensi pompa tersebut antara lain disebabkan karena a

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16

Li, Ziliang, Xingen Lu, Ge Han, Enliang Huang, Chengwu Yang, and Junqiang Zhu. "Numerical and experimental investigation of flow mechanism and application of tandem-impeller for centrifugal compressor." Aerospace Science and Technology 100 (May 2020): 105819. http://dx.doi.org/10.1016/j.ast.2020.105819.

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17

HAYAMI, Hiroshi, and Michiteru YAMAGUCHI. "Flow in the Tandem Cascade Impeller of a Pump Turbine with and without S-shape Characteristics." Journal of the Visualization Society of Japan 10, no. 1Supplement (1990): 147–50. http://dx.doi.org/10.3154/jvs.10.1supplement_147.

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18

Zhao, Peng-Fei, Yan Liu, and Xiao-Fang Wang. "Analysis of vortices and performance of different diffusers in a large mass flow coefficient centrifugal compressor." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 231, no. 4 (2017): 253–73. http://dx.doi.org/10.1177/0957650917701339.

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An appropriate diffuser following an impeller is critical to realize a high efficiency and a wide operating range for a centrifugal compressor stage. The purpose of this study is to investigate the effect of different types of vaned diffusers on a large mass flow coefficient centrifugal compressor stage performance under different operating conditions and to reveal the loss mechanisms in the vaned diffusers. Five vaned diffusers are studied. Flow fields and vortices in a conventional diffuser and a rib diffuser are first examined. Then, vortices and flow fields in three different tandem diffus

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19

FURUKAWA, Akinori, Tsuyoshi KARINO, Tetsuaki YAMASHITA, Kusuo OKUMA, Hisanori MATSUDA, and Shinzi SATO. "On Designing a Tandem Cascaded Impeller of Centrifugal Pump for High Air-Water Two-Phase Flow Performance." Transactions of the Japan Society of Mechanical Engineers Series B 66, no. 649 (2000): 2399–404. http://dx.doi.org/10.1299/kikaib.66.649_2399.

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20

Zhang, Shuo, Wenqian Xu, Shuhua Yang, Fuan Lu, and Huashu Dou. "Performance Enhancement of a Centrifugal Compressor by Designing a Tandem Cascade Diffuser." Energies 15, no. 13 (2022): 4570. http://dx.doi.org/10.3390/en15134570.

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The performance of a vane diffuser plays an important role in transforming the high kinetic energy into pressure energy at the impeller outlet of a centrifugal compressor. In this study, the performance enhancement of a centrifugal compressor is achieved by designing a tandem cascade diffuser. An optimum value of the total bending angle of a tandem cascade diffuser is obtained through numerical simulation. The total bending angle is defined as the angle between the tangent line of the front blade arc line at the leading edge point and the tangent line of the rear blade arc line at the trailing

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21

Hwang, YoonJei, HanYoung Park, SaiKee Oh, HoRim Lee, YoungSu Park, and KamGyu Lee. "The evaluation of energy saving performance for the modular design centrifugal chiller." E3S Web of Conferences 111 (2019): 01018. http://dx.doi.org/10.1051/e3sconf/201911101018.

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The modular concept design and operation of a centrifugal chiller offers the potential of increased cycle efficiency both at full load and off load conditions compared to the single compressor chiller. Modular chiller design is that a smaller, individual chiller can be connected with another, to make a larger capacity system. In the case of a tandem chiller, there would be faced to the higher initial cost or bigger foot print than a single compressor chiller at the same capacity because manufacturing cost, weight and size will be decreased according to increase of the refrigeration capacity. T

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22

FURUKAWA, Akinori, Tutomu TOGOE, Sinzi SATO, and Yasuo TAKAMATSU. "Fundamental studies of a tandem-bladed impeller of a centrifugal pump and the pump performance in liquid/gas two-phase flow." Transactions of the Japan Society of Mechanical Engineers Series B 55, no. 512 (1989): 1142–46. http://dx.doi.org/10.1299/kikaib.55.1142.

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23

Zheng, Yu, Song Da Li, Xiao Ming Wang, Wen Bin Li, and Wei Bing Li. "Numerical Approach in Predicting the Formation Process of Tandem Explosively Formed Projectile." Advanced Materials Research 148-149 (October 2010): 653–58. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.653.

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In order to find a proper resolution scheme for the formation process of tandem Explosively Formed Projectile (EFP) from shaped charge with double liners (SCDLL). 2D hydrocode was used to study the formation and penetration of SCDLL impelled by detonation products. The simulation is conducted to compare the effect of the following three resolution techniques on the prediction of velocity and shaped of EFP: Lagrangian, Eulerian-Lagrangian Coupling and Eulerian. In the simulation, shaped charge with one high explosive and two liners, ignited at the center point is studied. The results obtained f

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24

Li, Ziliang, Shengfeng Zhao, Xin’gen Lu, Ge Han, Chengwu Yang, and Junqiang Zhu. "Inducer/Exducer Matching Characteristics inside Tandem Impellers of a Highly Loaded Centrifugal Compressor." Journal of Thermal Science 29, no. 4 (2020): 928–44. http://dx.doi.org/10.1007/s11630-020-1191-8.

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25

Fariz, Farghani, Brijesh Patel, Hsien-Cheng Chiu, et al. "Optimization of Autoclave Reactors to Improve Bearing Life Using the Taguchi Method and the Response Surface Methodology." Inventions 8, no. 6 (2023): 144. http://dx.doi.org/10.3390/inventions8060144.

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Plastic pervasiveness in daily life has increased in tandem with population growth. Ethylene–vinyl acetate (EVA) is emerging as a popular compound for manufacturing plastic, which is obtained from ethylene and vinyl acetate synthesis. EVA is produced using autoclave reactors, which often encounter bearing damage under specific operating conditions. This research aims to optimize the parameters in autoclave reactors to enhance bearing life. The study focuses on two crucial factors: the number of impellers and the temperature, with bearing life as the response variable. Simulations using finite-

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26

Shah, Roshni, Alexcis Thomson, Kimberly Atianzar, et al. "Tandem Heart, Impella and intraaortic balloon pump assisted PCI: who gets what?" Cardiovascular Revascularization Medicine 12, no. 3 (2011): e11-e12. http://dx.doi.org/10.1016/j.carrev.2011.04.273.

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27

von Mackensen, Johanna K. R., Vanessa I. T. Zwaans, Ahmed El Shazly, et al. "Mechanical Circulatory Support Strategies in Takotsubo Syndrome with Cardiogenic Shock: A Systematic Review." Journal of Clinical Medicine 13, no. 2 (2024): 473. http://dx.doi.org/10.3390/jcm13020473.

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Background: Takotsubo syndrome is, by definition, a reversible form of acute heart failure. If cardiac output is severely reduced, Takotsubo syndrome can cause cardiogenic shock, and mechanical circulatory support can serve as a bridge to recovery. To date, there are no recommendations on when to use mechanical circulatory support and on which device is particularly effective in this context. Our aim was to determine the best treatment strategy. Methods: A systematic literature research and analysis of individual patient data was performed in MEDLINE/PubMed according to PRISMA guidelines. Our

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28

Bhatia, Nirmanmoh, Travis Richardson, Samuel Coffin, and Mary Keebler. "IATROGENIC MITRAL REGURGITATION: A RARE COMPLICATION OF IMPELLA DEVICE MANAGED WITH TANDEM HEART." Journal of the American College of Cardiology 67, no. 13 (2016): 1085. http://dx.doi.org/10.1016/s0735-1097(16)31086-5.

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29

Ovsianas, Justas, Petras Petkevičius, Norvydas Zapustas, Giedrė Bakšytė, and Andrius Macas. "Modern Mechanical Circulatory Support Devices." Sveikatos mokslai 25, no. 2 (2015): 87–93. http://dx.doi.org/10.5200/sm-hs.2015.036.

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Patients with hemodynamic instability when conservative measures are not effective remain a significant challenge for the intensive care specialists. Surgically implantable systems, which require considerable amount of time to insert and a cardiosurgery team, which is not present in smaller medical centres are not applicable in these situations. Significant mortality of patients predispone the develompement of minimally invasive and quickly applicable left ventricle assisting devices. The most commonly used and evaluated percutaneous assist systems are the intra- aortic balloon pump, the Impel

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30

Cortes, Guillermo Andres, Kevin Platt, Ryan Kobayashi, et al. "CRT-162 Impella® and Tandem Heart® for Circulatory Support in Refractory Cardiogenic Shock." JACC: Cardiovascular Interventions 7, no. 2 (2014): S3. http://dx.doi.org/10.1016/j.jcin.2013.12.010.

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31

Petrov, I., Z. Stankov, and S. Vasilev. "Cardiogenic shock - novelty and emerging therapeutic concepts." Bulgarian Cardiology 28, no. (3) (2022): 7–23. https://doi.org/10.3897/bgcardio.28.e87553.

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The cardiogenic shock is a state of low cardiac output, primarily due to cardiac dysfunction, which leads to severe organ hypoperfusion with tissue hypoxia and increased lactate levels. It presents a severe complication with a prevalence of around 15% of all forms of shock and 2-5% of the cardiogenic shock is a complications of acute heart failure. Despite the diverse etiology of the cardiogenic shock, up to 80% of the cases are due to acute myocardial infarction. The ischemia, leads to dysfunction of the myocardium cells, which causes a decline in the blood pressure and subsequent tissue hypo

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32

Myers, Timothy J. "Temporary Ventricular Assist Devices in the Intensive Care Unit as a Bridge to Decision." AACN Advanced Critical Care 23, no. 1 (2012): 55–68. http://dx.doi.org/10.4037/nci.0b013e318240e369.

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Morbidity and mortality in patients with cardiogenic shock remain high despite the recent advances in therapy. New temporary ventricular assist devices (VADs) that are rapidly applied to normalize cardiac output in patients with severe heart failure are being used more frequently. Bridge to decision describes the temporary use of a VAD to stabilize critically ill patients until complete diagnostic tests are performed and decisions about more definitive therapy are made. The CentriMag, Tandem-Heart, and Impella VADs offer versatility for use in many patients and in multiple hospital settings. T

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33

Thomson, Alexcis, Roshni Shah, Kimberly Atianzar, et al. "Hemodynamic support during high-risk PCI: a single-center comparison of in-hospital events between intraaortic balloon pump, Tandem Heart and Impella device." Cardiovascular Revascularization Medicine 12, no. 3 (2011): e13. http://dx.doi.org/10.1016/j.carrev.2011.04.277.

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34

Żbikowska, Karolina, and Krzysztof Wróbel. "Mechanical Circulatory Support in Delayed Surgery of Post-Infarction Ventricular Septal Rupture in Patients in Cardiogenic Shock—A Review." Journal of Clinical Medicine 11, no. 16 (2022): 4728. http://dx.doi.org/10.3390/jcm11164728.

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Post-infarction ventricular septal rupture (VSR) is a serious complication of myocardial infarction, which, in its natural course or treated medically, is related to high mortality rate. Surgical intervention remains the treatment of choice. Recent studies have shown that delayed surgery is related to better outcomes in comparison with urgent surgery; however, in many studies the impact of the patients’ initial hemodynamic status on the treatment outcomes often remains unclear. In this review, we analyze the outcomes of delayed surgical treatment of patients in cardiogenic shock in the course

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35

Petrov, I., Z. Stankov, and S. Vasilev. "Cardiogenic shock - novelty and emerging therapeutic concepts." Bulgarian Cardiology 28, no. 3 (2022): 7–23. http://dx.doi.org/10.3897/bgcardio.28.e87553.

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The cardiogenic shock is a state of low cardiac output, primarily due to cardiac dysfunction, which leads to severe organ hypoperfusion with tissue hypoxia and increased lactate levels. It presents a severe complication with a prevalence of around 15% of all forms of shock and 2-5% of the cardiogenic shock is a complications of acute heart failure. Despite the diverse etiology of the cardiogenic shock, up to 80% of the cases are due to acute myocardial infarction. The ischemia, leads to dysfunction of the myocardium cells, which causes a decline in the blood pressure and subsequent tissue hypo

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36

Atindu, Nyayu Fia, Muhammad Yerizam, and Erwana Dewi. "Rancang Bangun Digester Untuk Proses Pulping dari Campuran Tandan Kosong Kelapa Sawit dan Pelepah Pisang dengan Pelarut NaOH." Jurnal Pendidikan dan Teknologi Indonesia 1, no. 9 (2021): 365–74. http://dx.doi.org/10.52436/1.jpti.88.

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Kebutuhan pulp dan kertas di dunia semakin meningkat. Menurut Asosiasi Pulp dan Kertas Indonesia (APKI) permintaan global maupun domestik masih terus meningkat setiap tahunnya sebesar 2 %. Hal ini mengakibatkan ketersediaan bahan baku industri kertas menipis. Maka dari itu bahan baku lain yang dapat dijadikan suatu alternatif dari dampak tersebut yaitu tandan kosong kelapa sawit dan pelepah pisang. Digester merupakan suatu bejana pemasak yang digunakan sebagai suatu tempat proses delignifikasi bahan baku pada pembuatan pulp. Pada perancangan alat digester ini mempunyai dimensi meliputi : diame

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37

Nicola, Yannick, Manuel Fensterseifer, and Martin Böhle. "Numerical and Experimental Investigation of Streamlines for Tandem Impeller in a Centrifugal Pump." Journal of Fluids Engineering, December 16, 2022, 1–26. http://dx.doi.org/10.1115/1.4056523.

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Abstract Radial fluid machines with conventional impeller often lead to flow separation in the blade passage in case of high flow deflection. Tandem blades can be used to counteract this problem. Due to their properties, a new thin boundary layer forms at the rear blade profile, which benefits the deflection of the flow. The present investigation focuses on a comparison between numerical and experimental streamline patterns on the impellers blades suction side. For this purpose, a conventional impeller is compared with a tandem impeller. Furthermore, a method for creating oil painting patterns

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38

Fensterseifer, Manuel, Laura Sterle, and Martin Böhle. "Numerical and Experimental Investigation of the Performance of Tandem Vanes for a Centrifugal Pump." Journal of Fluids Engineering, May 25, 2022. http://dx.doi.org/10.1115/1.4054655.

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Abstract Conventional vane designs come with the disadvantage of flow detachment for high reflection. For axial machines, often tandem vanes are prevalent which combines two vanes for redirection of the flow and thus effectively prevents from detachment. However, their application for radial machines has hardly been investigated so far. This study investigates the influence of tandem vanes on the performance in terms of head and efficiency of a centrifugal pump. First, different tandem designs were numerically investigated based on Computational Fluid Dynamics (CFD). For a selected tandem vari

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39

Mohseni, Arman, Erik Goldhahn, René A. Van den Braembussche, and Joerg R. Seume. "Novel IGV Designs for Centrifugal Compressors and Their Interaction With the Impeller." Journal of Turbomachinery 134, no. 2 (2011). http://dx.doi.org/10.1115/1.4003235.

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In centrifugal compressors, variable inlet guide vanes (IGVs) are used to control the mass flow rate with negligible change in pressure ratio and shaft speed. The efficient operation of IGVs is limited to the range of aerodynamic stability of their vane profiles. Thin symmetric profiles, which are usually used, tend to exhibit flow separation already at low setting angles, resulting in a rapid decrease in the global efficiency. Three different guide vane profiles, including a symmetric reference profile, a two-piece tandem profile with a variable angle, and an s-cambered profile, together with

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40

Bourgeois, Jason A., Robert J. Martinuzzi, Eric Savory, Chao Zhang, and Douglas A. Roberts. "Assessment of Turbulence Model Predictions for an Aero-Engine Centrifugal Compressor." Journal of Turbomachinery 133, no. 1 (2010). http://dx.doi.org/10.1115/1.4001136.

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The accurate prediction of mean flow fields with high degrees of curvature, adverse pressure gradients, and three-dimensional turbulent boundary layers typically present in centrifugal compressor stages is a significant challenge when applying Reynolds averaged Navier–Stokes turbulence modeling techniques. The current study compares the steady-state mixing plane predictions using four turbulence models for a centrifugal compressor stage with a tandem impeller and a “fish-tail” style discrete passage diffuser. The models analyzed are the k-ε model (an industry standard for many years), the shea

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41

Zhang, Cheng, Hongxin Zhang, Guoping Huang, Manling Li, Yuxuan Yang, and Yongqiang Long. "Investigating the mechanism of flow of transonic compact crossover tandem diffuser." Physics of Fluids 36, no. 7 (2024). http://dx.doi.org/10.1063/5.0200359.

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Dealing with high transonic airflow at the outlet of a mixed-flow impeller is a challenging issue in research on the design of efficient and compact diffusers. A low aspect ratio and an adverse pressure gradient in the passage of the diffuser can lead to flow separation on the hub side of the bend and the suction side of the aft blade. Tandem blading can be used to attain flow control through an appropriate relative circumferential tandem position (λ). However, a comprehensive understanding of flow in a compact crossover tandem diffuser (CTD) requires further investigation. This study provides

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Oh, JongSik, Charles W. Buckley, and Giri L. Agrawal. "Numerical Investigation of Low Solidity Vaned Diffuser Performance in a High-Pressure Centrifugal Compressor—Part III: Tandem Vanes." Journal of Turbomachinery 134, no. 6 (2012). http://dx.doi.org/10.1115/1.4006300.

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As Part III, following the authors’ previous studies, the aerodynamic performance of two different tandem LSDs (low solidity diffusers), Tandem (A) and (B), in a high-pressure centrifugal compressor was numerically investigated over flow rates from impeller choke to minimal flows available in computation. Tandem (A) was of conventional design where the first row came directly from the authors’ previous studies (Part I Oh and Agrawal, 2007, “Numerical Investigation of Low Solidity Vaned Diffuser Performance in a High-Pressure Centrifugal Compressor - Part I : Influence of Vane Solidity,” ASME P

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Wilkosz, Benjamin, Johannes Schmidt, Christian Guenther, Philipp Schwarz, Peter Jeschke, and Caitlin Smythe. "Numerical and Experimental Comparison of a Tandem and Single Vane Deswirler Used in an Aero Engine Centrifugal Compressor." Journal of Turbomachinery 136, no. 4 (2013). http://dx.doi.org/10.1115/1.4024891.

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The present work is part of the research project at the Institute of Jet Propulsion and Turbomachinery at the RWTH Aachen University in collaboration with GE Aviation. The subject is the numerical and experimental analysis of two blading strategies used in the diffusion system of an aero engine centrifugal compressor. The transonic centrifugal compressor investigated contains a close-coupled impeller and passage diffuser, followed by a deswirler system. The deswirler redirects the flow towards the combustion chamber, while decreasing swirl and recovering pressure. It is characterized by a high

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van Eck, Hano, and Sybrand Johannes van der Spuy. "Upgrading the Compressor Stage of the CAT250TJ Micro Gas Turbine Engine." Aerotecnica Missili & Spazio, June 5, 2024. http://dx.doi.org/10.1007/s42496-024-00221-9.

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AbstractDue to their simplicity and relative ease of manufacture, single-stage centrifugal and mixed flow micro gas turbine (MGT) engines are preferred in thrust-based remotely piloted aerial vehicles. A single-stage mixed-flow compressor upgrade for the 200 N CAT250TJ MGT engine is numerically evaluated and presented. An in-house developed mean line application and commercial CFD software is used for the design and performance evaluation of the proposed upgrade configurations. The CAT250TJ – Gen1 engine features a single-stage centrifugal compressor, annular combustor, and single stage axial

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Vila, Pierre, Felicity de Vere, André Simon, and Christopher Walker. "Severe aortic valve regurgitation requiring mechanical aortic valve replacement following Impella device implantation." Perfusion, July 15, 2020, 026765912094133. http://dx.doi.org/10.1177/0267659120941339.

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Introduction: We describe a patient who developed severe aortic regurgitation following Impella left ventricular assist device implantation requiring aortic valve replacement. Case report: A previously healthy 34-year-old female presented with chest pain and flu-like symptoms. Electrocardiogram showed widespread ST elevation and serum troponin was raised, consistent with myocarditis. Coronary angiography was normal but the right coronary artery dissected. Subsequent cardiogenic shock required veno-arterial extracorporeal membrane oxygenation and Impella implantation. Myocardial function recove

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Zhang, Qun, Yu Han, Shukun Sun, et al. "Mortality in cardiogenic shock patients receiving mechanical circulatory support: a network meta-analysis." BMC Cardiovascular Disorders 22, no. 1 (2022). http://dx.doi.org/10.1186/s12872-022-02493-0.

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Abstract Objective Mechanical circulatory support (MCS) devices are widely used for cardiogenic shock (CS). This network meta-analysis aims to evaluate which MCS strategy offers advantages. Methods A systemic search of PubMed, EMBASE, and the Cochrane Central Register of Controlled Trials was performed. Studies included double-blind, randomized controlled, and observational trials, with 30-day follow-ups. Paired independent researchers conducted the screening, data extraction, quality assessment, and consistency and heterogeneity assessment. Results We included 39 studies (1 report). No signif

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Bratman, Eve Z., and William P. DeLince. "Dismantling white supremacy in environmental studies and sciences: an argument for anti-racist and decolonizing pedagogies." Journal of Environmental Studies and Sciences, January 1, 2022. http://dx.doi.org/10.1007/s13412-021-00739-5.

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AbstractMany academic disciplines are presently striving to reveal and dismantle structures of domination by working to reform and reimagine their curricula, and the ethics and values that underpin classroom settings. This trend is impelled by momentum from the Black Lives Matter movement in tandem with a worldwide call from Indigenous scholars and their allies for more equality in research and epistemological plurality. We contribute to such efforts through applying perspective and analysis concerning anti-racist and decolonized approaches to teaching environmental studies and sciences (ESS).

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Shariff, M., R. Doshi, I. Pedreira Vaz, et al. "Impella versus intra-aortic balloon pump in cardiogenic shock: a meta-analysis assessing 30-days mortality." European Heart Journal 41, Supplement_2 (2020). http://dx.doi.org/10.1093/ehjci/ehaa946.1130.

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Abstract Introduction Cardiogenic shock is linked with eminent morbidity and mortality despite advances in treatment modality. Adjuvant treatment modalities to provide mechanical haemodynamic support in the form of intra-aortic balloon pump (IABP) or Impella are being used among patients with cardiogenic shock. The Impella prunes left ventricular preload, whereas, IABP persuades after load reduction and both contribute to improved cardiac output. A few underpowered randomised control trials (RCTs) and observational studies compared short term mortality benefit of Impella juxtaposed to IABP amo

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Karacsonyi, Judit, Karen Deffenbacher, Keith H. Benzuly, et al. "Abstract 11451: Use of Mechanical Circulatory Support in Chronic Total Occlusion Percutaneous Coronary Intervention: Insights from the PROGRESS-CTO Registry." Circulation 144, Suppl_1 (2021). http://dx.doi.org/10.1161/circ.144.suppl_1.11451.

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Introduction: The use of mechanical circulatory support (MCS) in complex percutaneous coronary intervention (PCI) is the subject of ongoing investigation, but the role of MCS in chronic total occlusion (CTO) PCI is not well studied. Methods: We analyzed the patient and angiographic characteristics and procedural outcomes of 7,171 CTO PCIs performed between 2012 and June 2021 at 35 international centers. Results: Mean patient age was 64.5±10 years, mean left ventricular ejection fraction was 50 ± 13 % and 82% were men. MCS was used in 4.5% of the overall cases, MCS use was elective in 78.7% and

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Hill, Charles C., and Lindsay Raleigh. "Cardiac Support Devices." DeckerMed Critical Care of the Surgical Patient, March 23, 2017. http://dx.doi.org/10.2310/7ccsp.8009.

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Mechanical circulatory support (MCS) involves the use of intra-aortic balloon pump (IABP), short-term percutaneous ventricular assist devices, long-term surgically implanted continuous-flow ventricular assist devices (cf-LVADs), and extracorporeal membrane oxygenation (ECMO) for the treatment of acute and chronic heart failure and cardiogenic shock. IABP is increasingly recognized as an important adjunct in the postoperative treatment arsenal for those patients with severely reduced left ventricular systolic function. Short-term percutaneous options for the treatment of acute right and left he

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