Experimental study of the flow field of a high head model pump turbine based on PIV technique

2021 ◽  
Vol 33 (5) ◽  
pp. 1045-1055
Author(s):  
De-min Liu ◽  
Wei-lin Xu ◽  
Yong-zhi Zhao
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Head Model ◽  
Pump Turbine ◽  
Piv Technique ◽  
High Head

scholarly journals Experimental research on flow field of high head pump turbine based on PIV test

2021 ◽  
Vol 627 ◽  
pp. 012016
Author(s):  
D M Liu ◽  
L B Ma ◽  
N Li ◽  
Y Z Zhao ◽  
Huan Cheng
Keyword(s):  
Flow Field ◽  
Experimental Research ◽  
Pump Turbine ◽  
High Head

Experimental Study of the Characteristics of Gas Impinging Streams Using PIV Technique

2013 ◽  
Author(s):  
Wei Wei ◽  
ZhiYi Li ◽  
Fengxia Liu ◽  
Zhijun Liu
Keyword(s):  
Mass Transfer ◽  
Experimental Study ◽  
Flow Field ◽  
Flow Rate ◽  
Particle Image ◽  
Velocity Fields ◽  
Experimental Equipment ◽  
Piv Technique ◽  
Tracer Particles ◽  
Image Velocimetry

Impinging streams technology has been widely used in many applications in recent years because of its enhancement to the heat and mass transfer between phases. In this paper, in order to investigate the influences of the impinging distance and flow rate on the characters of the flow field, gas-gas impinging streams flow fields are tested experimentally and analyze qualitatively with particle image velocimetry (PIV). The experimental equipment consists of two opposite nozzles which are the same axis. A PIV system is used to measure the characters of the 2-D flow field between two opposite nozzles. The gas is delivered by a compressor through two opposite jets which could be seeded with oil droplets as tracer particles. The effects of the flow rate and impinging distance on the velocity fields of impinging zone are investigated in detail. As the flow rate increases from 0.2 m3/h to 0.8 m3/h, the width of impinging zone increases from 0.25 to 0.5. However, the range of impinging zone does not change significantly as the impinging distance increases from 61mm to 94mm. The results indicate that the PIV technique is an effective method to measure and analyze the characters of impinging streams.

scholarly journals Experimental research on flow field of a high head model pump turbine based on PIV test

2020 ◽  
Author(s):  
Demin Liu ◽  
Yongzhi Zhao ◽  
Weilin Xu
Keyword(s):  
Flow Field ◽  
Pressure Pulsation ◽  
Internal Flow ◽  
Operating Conditions ◽  
Head Model ◽  
Test Technique ◽  
Pump Turbine ◽  
Flow Angle ◽  
Operating Condition ◽  
Cavitation Pressure

Abstract Pump turbine operating conditions are complex, mainly including turbine mode and pump mode. Pump turbines have various instability problems during operation, such as S-shaped, pump hump, pressure pulsation and cavitation. PIV (Particle Image Velocimetry) is a very effective test technique for the internal flow field observation of pump turbines. In this paper, the internal flow field of pump hump, cavitation, pressure pulsation and four quadrants of the pump turbine are tested by PIV technology. The experimental observations show that the internal flow on those unstable working conditions of the pump turbine is extremely complicated. Those conditions which the vortex separation is serious and the flow angle is changed is far away the best efficiency working condition. Since the operating condition deviates from the optimal operating condition, the inflow Angle is changed and the inflow Angle is far away from the optimal inflow Angle.And the vortex induces and develops strongly by PIV test. The flow phenomenon are demonstrated at each operating points by PIV test.

Experimental Study of Turbulent Macroinstabilities in an Agitated System with Axial High-Speed Impeller and with Radial Baffles

1996 ◽  
Vol 61 (6) ◽  
pp. 856-867 ◽  
Author(s):  
Oldřich Brůha ◽  
Ivan Fořt ◽  
Pavel Smolka ◽  
Milan Jahoda
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
High Speed ◽  
Experimental Results ◽  
Turbulent Regime ◽  
Frequency Of Occurrence ◽  
Visualization Method ◽  
Entire Flow

The frequency of turbulent macroinstability occurrence was measured in liquids agitated in a cylindrical baffled vessel. As it has been proved by preceding experimental results of the authors, the stochastic quantity with frequency of occurrence of 10-1 to 100 s-1 is concerned. By suitable choosing the viscosity of liquids and frequency of impeller revolutins, the region of Reynolds mixing numbers was covered from the pure laminar up to fully developed turbulent regime. In addition to the equipment making it possible to record automatically the macroinstability occurrence, also the visualization method and videorecording were employed. It enabled us to describe in more detail the form of entire flow field in the agitated system and its behaviour in connection with the macroinstability occurrence. It follows from the experiments made that under turbulent regime of flow of agitated liquids the frequency of turbulent macroinstability occurrence is the same as the frequency of the primary circulation of agitated liquid.

scholarly journals Dynamics of flow in a branching channel

2021 ◽  
Vol 22 ◽  
pp. 25
Author(s):  
Václav Uruba ◽  
Pavel Procházka ◽  
Vladislav Skála
Keyword(s):  
Flow Field ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Separated Flow ◽  
Heat Transfer Process ◽  
Dynamical Behaviour ◽  
Main Channel ◽  
Flow Dynamics ◽  
Mean Flow ◽  
Piv Technique

Flow in a branched channel is studied experimentally using the PIV technique. The presented study is concentrated on clarifying the dynamical behaviour in individual branches. The 11 branches issuing from the main channel perpendicularly, all channels are of rectangular cross-section. First, the time-mean flow-field is shown, then the flow dynamics is investigated using the OPD method. Flow patterns and frequencies are evaluated in three selected branches. The separated flow in branches exhibits highly dynamical behaviour, which differs substantially in the branches close to the inflow, in the main channel middle and close to its end. The typical topologies and frequencies of the detected quasi-periodical structures in the channel braches are shown in the study. Mostly, the flow-fields are populated by trains of vortices with alternating orientation and saddle-like structures. The flow-field close to the channel walls affects heat transfer process between the wall and fluid.

scholarly journals Improvement of Pump Performance at Off-Design Conditions

1985 ◽  
Author(s):  
J. Paulon ◽  
C. Fradin ◽  
J. Poulain
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Mass Flow ◽  
Flow Characteristic ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Pump Performance ◽  
Wide Range ◽  
Mass Flows ◽  
Design Value

Industrial pumps are generally used in a wide range of operating conditions from almost zero mass flow to mass flows larger than the design value. It has been often noted that the head-mass flow characteristic, at constant speed, presents a negative bump as the mass flow is somewhat smaller than the design mass flows. Flow and mechanical instabilities appear, which are unsafe for the facility. An experimental study has been undertaken in order to analyze and if possible to palliate these difficulties. A detailed flow analyzis has shown strong three dimensional effects and flow separations. From this better knowledge of the flow field, a particular device was designed and a strong attenuation of the negative bump was obtained.

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