scholarly journals Influence of Prewhirl Regulation by Inlet Guide Vanes on Cavitation Performance of a Centrifugal Pump

Energies ◽  
2014 ◽  
Vol 7 (2) ◽  
pp. 1050-1065 ◽  
Author(s):  
Lei Tan ◽  
Baoshan Zhu ◽  
Shuliang Cao ◽  
Yuchuan Wang ◽  
Binbin Wang
Keyword(s):  
Centrifugal Pump ◽  
Guide Vanes ◽  
Inlet Guide Vanes ◽  
Cavitation Performance

scholarly journals Simulation of cavitation performance of an axial flow pump with inlet guide vanes

2016 ◽  
Vol 8 (6) ◽  
pp. 168781401665158 ◽  
Author(s):  
Weimin Feng ◽  
Qian Cheng ◽  
Zhiwei Guo ◽  
Zhongdong Qian
Keyword(s):  
Axial Flow ◽  
Guide Vanes ◽  
Inlet Guide Vanes ◽  
Cavitation Performance ◽  
Axial Flow Pump ◽  
Flow Pump

Numerical investigation of influence of inlet guide vanes on unsteady flow in a centrifugal pump

2015 ◽  
Vol 229 (18) ◽  
pp. 3405-3416 ◽  
Author(s):  
Wang Yuchuan ◽  
Tan Lei ◽  
Zhu Baoshan ◽  
Cao ShuLiang ◽  
Wang Binbin
Keyword(s):  
Unsteady Flow ◽  
Centrifugal Pump ◽  
Pressure Fluctuations ◽  
Turbulence Models ◽  
Rotational Frequency ◽  
Pump Impeller ◽  
Guide Vanes ◽  
Pump Performance ◽  
Inlet Guide Vanes ◽  
Dominant Frequencies

The influence of inlet guide vanes on unsteady flow in a centrifugal pump is numerically investigated. The independences of mesh elements, time steps and turbulence models are studied, and the satisfactory agreement between experimental and numerical results of the centrifugal pump performance validates the reliability and accuracy of the numerical model. The frequency characteristics of pressure fluctuations in impeller and volute are nearly the same for the pump without and with inlet guide vanes in the angle range from −36° to +36°. In the pump impeller, the dominant frequencies are mainly the rotational frequency fi (24.17 Hz) or 2 fi, and in volute they are the blade passing frequency fBPF (145 Hz). For the large inlet guide vanes angles of −60°and +60°, the maximum amplitudes of pressure fluctuations in pump impeller and volute are stronger than that in pump without inlet guide vanes. Therefore, the influence of inlet guide vanes on unsteady flow in the centrifugal pump is slight when the inlet guide vanes angles are regulated in a suitable region.

Influence of axial distance on pre-whirl regulation by the inlet guide vanes for a centrifugal pump

2012 ◽  
Vol 55 (4) ◽  
pp. 1037-1043 ◽  
Author(s):  
Lei Tan ◽  
ShuLiang Cao ◽  
YuMing Wang ◽  
BaoShan Zhu
Keyword(s):  
Centrifugal Pump ◽  
Axial Distance ◽  
Guide Vanes ◽  
Inlet Guide Vanes

Numerical investigation of clocking effect on a centrifugal pump with inlet guide vanes

2016 ◽  
Vol 33 (2) ◽  
Author(s):  
WANSHI QU ◽  
lei tan ◽  
Shuliang CAO ◽  
YUCHUAN WANG ◽  
YUN XU
Keyword(s):  
Flow Field ◽  
Numerical Investigation ◽  
Centrifugal Pump ◽  
Flow Rate ◽  
Pressure Fluctuation ◽  
Design Methodology ◽  
Design Flow ◽  
Guide Vanes ◽  
Inlet Guide Vanes ◽  
Design Flow Rate

Purpose The paper aims to investigate the clocking effect on a centrifugal pump with inlet guide vanes (IGVs). Design/methodology/approach The paper uses a computation fluid dynamics (CFD) framework to solve the unsteady flows in a centrifugal pump with inlet guide vanes. The relative position between the stationary vanes and the stationary volute tongue is defined as the clocking position when IGVs inside the suction pipe rotate along the circumferential direction. Findings The results show that clocking positions have little effect on the pump head and efficiency, however their influences are obvious for the pressure fluctuation and flow field in the centrifugal pump. The maximum difference of pressure amplitude at dominant frequency reach up to 28% on the monitoring point V8 at different clocking positions under design flow rate. For the large flow rate, the clocking effect on flow field and pressure fluctuation in centrifugal pump is similar to that of design flow rate. However, the clocking effect is nearly negligible at partial flow rate, because there are reverse flows around the tongue tip and obvious vortexes forming and developing in the impeller. Those complex phenomena interacting in the centrifugal pump make the clocking effect less evident. Originality/value The numerical investigation reveals the clocking effect on a centrifugal pump with inlet guide vanes, which also valuable for the stable operation and optimal design of centrifugal pumps.

Inlet Guide Vane Performance of Centrifugal Blowers

1961 ◽  
Vol 83 (4) ◽  
pp. 371-378
Author(s):  
A. J. Stepanoff
Keyword(s):  
Centrifugal Pump ◽  
Guide Vane ◽  
Power Reduction ◽  
Single Stage ◽  
Experimental Results ◽  
Inlet Guide Vane ◽  
Pump Field ◽  
Guide Vanes ◽  
Inlet Guide Vanes ◽  
Specific Speed

The function and effectiveness of the inlet guide vanes to control the blower output and power requirements are examined. Calculated and experimental results of the power reduction by means of guide vanes are presented. The concept of the “Inlet Specific Speed” widely used in centrifugal pump field is discussed in application to the blowers. A method of estimating the performance of single-stage blowers for any position of the guide vanes is suggested. A “casing characteristic” is introduced for this purpose and its utility for the calculation of the impeller diameter for a reduction of the output is demonstrated. The performance of the inlet vanes of multistage blowers is reviewed.

Influence of Geometry of Inlet Guide Vanes on Pressure Fluctuations of a Centrifugal Pump

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Ming Liu ◽  
Lei Tan ◽  
Shuliang Cao
Keyword(s):  
Centrifugal Pump ◽  
Turbulence Model ◽  
Pressure Fluctuations ◽  
Three Dimensional ◽  
Maximum Amplitude ◽  
Dominant Frequency ◽  
Centrifugal Pumps ◽  
Maximum Increase ◽  
Guide Vanes ◽  
Inlet Guide Vanes

Prewhirl regulation by inlet guide vanes (IGVs) has been proven as an effective method for operation regulation of centrifugal pumps. By contrast, the influence of the geometry of IGVs on operation stability of centrifugal pump remains unknown. The pressure fluctuations and flow patterns in a centrifugal pump without and with two-dimensional (2D) or three-dimensional (3D) IGVs are investigated numerically at 1.0Qd, 0.6Qd, and 1.2Qd. Renormalization group (RNG) k–ε turbulence model is used as turbulence model, and fast Fourier transform (FFT) method is used to analyze the pressure fluctuations. The dominant frequency of pressure fluctuations in impellers is either the rotational frequency fi or twice thereof for pumps without and with IGVs at three flow rates, while the dominant frequency is constantly the blade passing frequency in volute. For 1.0Qd, the comparison of pumps without IGVs indicates that the maximum amplitude of pressure fluctuations at fi in pumps with 2D IGVs is decreased by an average of 22.2%, and the amplitude is decreased by an average of 44.9% in pumps with 3D IGVs. The IGVs mainly influence the pressure fluctuations at fi but indicate minimal influence at 2fi. For 0.6Qd, the comparison of pumps without IGVs denotes that the maximum amplitudes of pressure fluctuations at fi in pumps with 2D or 3D IGVs both increase; the maximum increase is 2.01%. For 1.2Qd, the comparison of pumps without IGVs indicates that the maximum amplitudes of pressure fluctuations at fi in pumps with 2D or 3D IGVs both decrease; the maximum decline is 15.9%.

Experimental and numerical analysis of the unsteady influence of the inlet guide vanes on cavitation performance of an axial pump

2018 ◽  
Vol 233 (11) ◽  
pp. 3816-3826 ◽  
Author(s):  
Zhiwei Guo ◽  
Jingye Pan ◽  
Zhongdong Qian ◽  
Bin Ji
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Computational Fluid Dynamics ◽  
Guide Vane ◽  
Inlet Guide Vane ◽  
Guide Vanes ◽  
Inlet Guide Vanes ◽  
Cavitation Performance ◽  
Axial Pump ◽  
Simulation Results

The effect of the inlet guide vanes on cavitation performance of an axial pump is investigated to assess the mechanism for cavitation in pumps and improve their cavitation performance. The effect of inlet guide vane angles on cavitation performance was assessed experimentally, and computational fluid dynamics was used to analyze the inner flow field of the axial pump and to probe the cavitation mechanism. The simulation results agree qualitatively with the experimental data, showing that cavitation performance is improved with positive inlet guide vane angles but hampered with negative ones. The cavitation performance itself is controlled by the cavitation volume, which first expands circumferentially when the net positive suction head decreases from a certain large value and then develops toward the axis radially after the net positive suction head reaches a certain value. This is when the cavitation performance deteriorates. Comparing cavitation volume for the critical net positive suction head as determined by two different methods, the method based on efficiency drop (NPSHeff.,1%) is found to be more suitable than that based on head drop (NPSHhead.,3%). Furthermore, the distribution of swirl is shown to be closely related to the distribution of cavitation, a feature that may be used to predict cavitation along the impeller.

Controllable velocity moment and prediction model for inlet guide vanes of a centrifugal pump

2018 ◽  
Vol 35 (3) ◽  
pp. 1364-1382 ◽  
Author(s):  
Ming Liu ◽  
Lei Tan ◽  
Yabin Liu ◽  
Yun Xu ◽  
Shuliang Cao
Keyword(s):  
Prediction Model ◽  
Centrifugal Pump ◽  
Flow Rate ◽  
Stokes Equations ◽  
Design Method ◽  
Three Dimensional ◽  
Guide Vanes ◽  
Content Type ◽  
Inlet Guide Vanes ◽  
Velocity Moment

Purpose This paper aims to investigate the effect of three-dimensional (3D) inlet guide vanes (IGVs) on performance of a centrifugal pump. Design/methodology/approach A design method for 3D IGVs is proposed based on the controllable velocity moment, which is determined by a fourth-order dimensionless function. Numerical simulation of the centrifugal pump with IGVs is carried out by solving the Reynolds-averaged Navier–Stokes equations. The method of frozen rotor is applied to couple the stationary and rotational domain. Findings The efficiency of pump with 3D IGVs is higher than that with 2D IGVs for most prewhirl angles, which validate the advancement of 3D IGVs on prewhirl regulation. The effect of prewhirl regulation at small flow rate is more significant than that at large flow rate. Originality/value A prediction model of velocity moment based on the Oseen vortex is proposed to describe the flow pattern downstream the IGVs.

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