Results 71 to 80 of about 5,160 (221)

Numerical Simulation of Pressure Pulsations in Francis Turbines

IOP Conference Series: Earth and Environmental Science, 2012
For more than 150 years, hydraulic power plants have been strongly contributing to energy generation. At present, with the expanding participation of other non-storable renewable energy sources in the electrical market composition, water turbines can importantly contribute to the electrical grid stability and to energy storage.
M V Magnoli, R Schilling
openaire   +1 more source

Careful CO Addition Enhances Autotrophic d‐Lactate Formation With Engineered Acetobacterium woodii

Engineering in Life Sciences, Volume 26, Issue 2, February 2026.
ABSTRACT The acetogen A. woodii efficiently converts CO2 and H2 to acetate. Metabolic engineering enabled the autotrophic production of non‐native products, for example, d‐lactate from CO2 by overexpression of d‐lactate dehydrogenase from Leuconostoc mesenteroides and knockout of the native lactate dehydrogenase. During gas fermentation with acetogens,
Anna Stock, Inka Sotzeck, Kira Baur, Frank Bengelsdorf, Dirk Weuster‐Botz   +4 more
wiley   +1 more source

Numerical study on unidirectional fluid–solid coupling of Francis turbine runner

Advances in Mechanical Engineering, 2015
To analyze the fluid–solid coupling stress characteristics of the Francis turbine runner comprehensively, based on the Reynolds-averaged Navier–Stokes equations and shear stress transport k-ω turbulence model, this article performs numerical simulation ...
Kan Kan, Yuan Zheng, Xin Zhang, Chunxia Yang, Yuquan Zhang   +4 more
doaj   +1 more source

Comparative Numerical Studies for the Flow Energy Dissipation Features in a Vertical Two‐Stage Centrifugal Pump in Pump and Turbine Conditions

Energy Science &Engineering, Volume 14, Issue 2, Page 764-779, February 2026.
Based on entropy theory, this study presents a comparative numerical analysis of the flow energy dissipation (FED) in a VTSP under two distinct operating conditions: pump condition and turbine condition, both characterized by relatively high hydraulic efficiencies of 88.9% and 87.4%, respectively. In pump condition, the highest FED production occurs in
S. Liu, T. P. Chen, Y. Li, M. Q. Liang, Y. J. Zhang, X. Z. Wei   +5 more
wiley   +1 more source

Effect of Guide Vane Clearance Gap on Francis Turbine Performance

Energies, 2016
Francis turbine guide vanes have pivoted support with external control mechanism, for conversion of pressure to kinetic energy and to direct them to runner vanes.
Ravi Koirala, Baoshan Zhu, Hari Prasad Neopane   +2 more
doaj   +1 more source

Understanding the Role of pH Regulation and Neutralizing Agents in Organic Acid Production and Growth of Aspergillus oryzae

Biotechnology and Bioengineering, Volume 123, Issue 1, Page 116-133, January 2026.
We show that pH and neutralization strategy strongly influence the growth, pellet morphology, and organic acid production of Aspergillus oryzae. Acidic and alkaline conditions lead to hairy, dispersed pellets, while near‐neutral environments favour compact pellet formation.
Lukas Hartmann, Mark Christopher Martin, Anke Neumann, Dirk Holtmann, Katrin Ochsenreither   +4 more
wiley   +1 more source

Extending the operational range of Francis turbines: A case study of a 200 MW prototype

Energy Conversion and Management: X
Francis turbines are now widely used to support the integration of renewable and intermittent energy sources such as solar and wind power. Consequently, these turbines often operate away from their best efficiency point (BEP).
Michel J. Cervantes, Joel Sundström, Shahab Shiraghaee, Morten Kjeldsen, Erik Jacques Wiborg   +4 more
doaj   +1 more source

Toward the Development of a Uranium‐Based Redox‐Flow Battery

ChemSusChem, Volume 19, Issue 1, January 2026.
The first all‐uranium‐based electrochemical cell has been realized using simple [UIV/V(tBuacac)4]0/+ and [UIII/IV(N(SiMe3)2)4]–/0 complexes, readily available in convenient, scalable syntheses, as anolyte and catholyte couples. Operating at a cell potential of 2.2 V with a projected energy density of 0.357 Wh kg–1, this system establishes a foundation ...
Pablo Waldschmidt, Nadir Jori, Judith Riedhammer, Frank W. Heinemann, Karsten Meyer   +4 more
wiley   +1 more source

Solid–Liquid Flow Analysis of Francis‐99 Turbine Runner: Effects of Sediment Concentration

Energy Science & Engineering
This study examines the behavior of solid–liquid two‐phase flow within the runner of the Francis‐99 turbine. Numerical simulations were carried out by Ansys Fluent software using the Mixture multiphase flow model along with the Realizable k‐ε turbulence ...
Kang Xu, Pinyu Xiang, Ziyao Zhou, Yufan Xiong, Zhishun Yu, Xiaobing Liu, Jiayang Pang   +6 more
doaj   +1 more source

Effect of Guide Vane Pitch Circle Diameter on Pressure Fluctuation in Vaneless Zone of Francis Turbine

Journal of Applied Fluid Mechanics, 2020
In a Francis turbine, the guide vanes are arranged in the direction of flow behind the stay vanes. And as it is generally believed that the outlet angle of water after it flows through the spiral case and stay vanes is fixed, the flow and flow ...
Z. J. Wu, W. K. Liang, W. Dong
doaj