Results 251 to 260 of about 1,539,229 (306)

Hydrodynamic behavior of an airlift reactor with net draft tube with different configurations: Numerical evaluation using CFD technique

, 2020
In terms of gas holdup, liquid velocity, and volumetric mass transfer coefficient for oxygen (KLa), the hydrodynamic behavior of four configurations of an airlift reactor (ALR) with a net draft tube (NDT) of different net mesh sizes (ALR-NDT-3, 6, 12 ...
Reza Salehpour, E. Jalilnejad, Mehran Nalband, K. Ghasemzadeh   +3 more
semanticscholar   +1 more source

A novel comprehensive evaluation method of the draft tube pressure pulsation of Francis turbine based on EEMD and information entropy

Mechanical systems and signal processing, 2019
Undesirable pressure pulsations will be induced by flow instabilities in the draft tube when the Francis turbine operates at off-design conditions, which have multiple effects on the steady operation, and the effects vary with the operating condition ...
Weiyu Wang, Qijuan Chen, Donglin Yan, Dazhou Geng   +3 more
semanticscholar   +1 more source

Optimization methodology assessment for the inlet velocity profile of a hydraulic turbine draft tube: part II—performance evaluation of draft tube model

Journal of Global Optimization, 2012
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Sergio, Galván, Carlos, Rubio, Pacheco, Jesús, Gildardo, Solorio, Georgina, Carbajal   +4 more
openaire   +1 more source

Model and Prototype Draft Tube Pressure Pulsations

1996
All producers of Francis turbines daily meet the problem of draft tube vortex appearance and its consequences [1,2,3,4]. Limitations in turbine operation because of the vortex appearance and undesirable consequences on hydraulic system are sufficient reason for its intensive researching.
Vladimir Kercan, Marin Bajd, Vesko Djelić, Andrej Lipej, Dragica Jošt   +4 more
openaire   +1 more source

Experimental investigation of flows inside draft tube of a high-head pump-turbine

Renewable Energy, 2019
Due to fast and frequently switch between pumping and generating modes several times daily and continuously increase to operate at off-design conditions, understanding the detail of flows is a prerequisite to the design and safety operation of a pump ...
X. Lai, Q. Liang, D. Ye, Xiaoming Chen, M. Xia   +4 more
semanticscholar   +1 more source

Suppression of vortex rope oscillation and pressure vibrations in Francis turbine draft tube using various strategies

Journal of Hydrodynamics, 2021
Lei Zhu, Ruizhi Zhang, A. Yu, Li Lu, Xianwu Luo   +4 more
semanticscholar   +1 more source

Suppression of flow instability in the Francis hydro turbine draft tube by J-groove shape optimization at a partial flow rate

Journal of Mechanical Science and Technology, 2021
U. Shrestha, Young-Do Choi
semanticscholar   +1 more source

Liquid circulation in a draft-tube bubble column

Chemical Engineering Science, 1985
Abstract A study of liquid circulation in a draft-tube bubble column (250 mm diameter, 60l. capacity) using a flow-follower technique is reported. It was observed that annulus liquid circulation velocity increased to a maximum with air flowrate and a maximum in the volumetric liquid circulation rate occurred at a tube: column diameter ratio of about ...
openaire   +1 more source

A new draft tube shape optimisation methodology of introducing inclined conical diffuser in hydraulic turbine

Energy, 2022
Xing Zhou, He-gao Wu, Li Cheng, Quanshui Huang, Chang-Zheng Shi   +4 more
semanticscholar   +1 more source

CFD ANALYSIS ON DIFFERENT ELBOW DRAFT TUBES

i-manager's Journal on Mechanical Engineering, 2021
SAI RAJA CHADA JITHENDRA, YUVARAJ MANDA AKHIL, BHASKAR ANUSURI PHANI   +2 more
openaire   +1 more source