Vortex Characteristics in the Draft Tube at Turbine Mode of a Pump Turbine in a Laboratory-Scale Model

2021 ◽  
Vol 24 (6) ◽  
pp. 12-21
Author(s):  
Seung-Jun Kim ◽  
Jun-Won Suh ◽  
Hyeon-Mo Yang ◽  
Jungwan Park ◽  
Jin-Hyuk Kim
Keyword(s):  
Draft Tube ◽  
Laboratory Scale ◽  
Scale Model ◽  
Pump Turbine ◽  
Turbine Mode

scholarly journals Experimental investigation of flows in a high-head pump-turbine draft tube at turbine mode

2018 ◽  
Vol 163 ◽  
pp. 012119 ◽  
Author(s):  
X D Lai ◽  
Q W Liang ◽  
X M Chen ◽  
Q Q Gou ◽  
D X Ye ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Draft Tube ◽  
Pump Turbine ◽  
High Head ◽  
Turbine Mode

Precessional Vortex Characteristics according to the Swirl Number in the Draft tube at Turbine Mode of a Pump-Turbine

2019 ◽  
Vol 22 (5) ◽  
pp. 5-12
Author(s):  
Chan Lee ◽  
Jun-Won Suh ◽  
Young-Seok Choi ◽  
Jun-Gwan Park ◽  
No-Hyun Park ◽  
...  
Keyword(s):  
Draft Tube ◽  
Swirl Number ◽  
Pump Turbine ◽  
Turbine Mode

scholarly journals Turbine mode start-up simulation of a variable speed Francis pump-turbine prototype – Part II: 3-D unsteady CFD and FEM

2021 ◽  
Vol 774 (1) ◽  
pp. 012070
Author(s):  
D. Biner ◽  
S. Alligné ◽  
V. Hasmatuchi ◽  
C. Nicolet ◽  
N. Hugo ◽  
...  
Keyword(s):  
Variable Speed ◽  
Pump Turbine ◽  
Start Up ◽  
Turbine Mode

scholarly journals Pressure Analysis in the Draft Tube of a Pump-Turbine under Steady and Transient Conditions

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4732
Author(s):  
Jing Yang ◽  
Yue Lv ◽  
Dianhai Liu ◽  
Zhengwei Wang
Keyword(s):  
Steady State ◽  
Pressure Pulsation ◽  
Transient Flow ◽  
Draft Tube ◽  
Simulation Method ◽  
Wall Pressure ◽  
Pump Turbine ◽  
Steady State Condition ◽  
Transient Conditions ◽  
Pumped Storage

Pumped-storage power stations play a regulatory role in the power grid through frequent transition processes. The pressure pulsation in the draft tube of the pump-turbine under transient processes is important for safe operation, which is more intense than that in the steady-state condition. However, there is no effective method to obtain the exact pressure in the draft tube in the transient flow field. In this paper, the pressure in the draft tube of a pump-turbine under steady-state and transient conditions are studied by means of CFD. The reliability of the simulation method is verified by comparing the real pressure pulsation data with the test results. Due to the distribution of the pressure pulsation in the draft tube being complex and uneven, the location of the pressure monitoring points directly affects the accurate judgement of cavitation. Eight monitoring surfaces were set in the straight cone of the draft tube and nine monitoring points were set on each monitoring surface to analyze the pressure differences on the wall and inside the center of the draft tube. The relationships between the pressure pulsation value inside the center of the draft tube and on the wall are studied. The “critical” wall pressure pulsation value when cavitation occurs is obtained. This study provides references for judging cavitation occurrences by using the wall pressure pulsation value in practical engineering.

scholarly journals Scaling for lobe and cleft patterns in particle-laden gravity currents

2013 ◽  
Vol 20 (1) ◽  
pp. 121-130 ◽  
Author(s):  
A. Jackson ◽  
B. Turnbull ◽  
R. Munro
Keyword(s):  
Granular Material ◽  
Froude Number ◽  
Particle Diameter ◽  
Granular Flows ◽  
Leading Edge ◽  
Air Entrainment ◽  
Gravity Currents ◽  
Laboratory Scale ◽  
Scale Model ◽  
Snow Avalanches

Abstract. Lobe and cleft patterns are frequently observed at the leading edge of gravity currents, including non-Boussinesq particle-laden currents such as powder snow avalanches. Despite the importance of the instability in driving air entrainment, little is known about its origin or the mechanisms behind its development. In this paper we seek to gain a better understanding of these mechanisms from a laboratory scale model of powder snow avalanches using lightweight granular material. The instability mechanisms in these flows appear to be a combination of those found in both homogeneous Boussinesq gravity currents and unsuspended granular flows, with the size of the granular particles playing a central role in determining the wavelength of the lobe and cleft pattern. When scaled by particle diameter a relationship between the Froude number and the wavelength of the lobe and cleft pattern is found, where the wavelength increases monotonically with the Froude number.

scholarly journals Identification of a Suitable Solid Carrier as a Matrix for the Permeable Reactive Barrier of Laboratory Scale Model Aquifer for Atrazine Degradation

1970 ◽  
Vol 25 (1) ◽  
pp. 119-128 ◽  
Author(s):  
Binita K Shrestha ◽  
Pawan Raj Shakya ◽  
MIM Soares
Keyword(s):  
Laboratory Scale ◽  
Permeable Reactive Barrier ◽  
Scale Model ◽  
Pseudomonas Sp ◽  
Reactive Barrier ◽  
Solid Carrier ◽  
Different Types ◽  
Simultaneous Loss ◽  
Static Conditions ◽  
Atrazine Degradation

Three different types of physical substrata such as sand, granualar activated carbon (GAC) and plastic macaroni beads were selected to identify a suitable solid carrier as a course matrix for the permeable reactive barrier (PRB) in a sand filled two-dimensional laboratory-scale model aquifer. An adhesion experiment was performed and tested with Pseudomonas sp ADP (PASP) under agitated as well as static conditions. In static conditions, adhesion to GAC was the highest (80%) followed by that to beads (60%). No adhesion to sand was observed under static or agitated conditions. Since atrazine is adsorbed by GAC, its bioavailability for degradation by PADP may be affected. To test this, simultaneous loss of atrazine and release of chloride (dechlorination, the first step in the pathway of atrazine degradation by PADP) were determined in the presence and absence of GAC. Although cells remained viable, no significant chloride release was detected. Thus, plastic macaroni beads were identified and selected as the most suitable support for PADP in the biological permeable reactive barrier (BPRB) of the model aquifer.Key words: Suitable Solid; Laboratory Scale; PADPTribhuvan University JournalVol. XXV, No. 1, 2005Page:119-128Uploaded date: 26, September, 2010

scholarly journals Multiobjective Optimization of a Counterrotating Type Pump-Turbine Unit Operated at Turbine Mode

2014 ◽  
Vol 6 ◽  
pp. 467235 ◽  
Author(s):  
Jin-Hyuk Kim ◽  
Risa Kasahara ◽  
Toshiaki Kanemoto ◽  
Toru Miyaji ◽  
Young-Seok Choi ◽  
...  
Keyword(s):  
Multiobjective Optimization ◽  
Turbine Unit ◽  
Pump Turbine ◽  
Turbine Mode
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