Design method of controllable velocity moment and optimization of pressure fluctuation suppression for a multiphase pump

2020 ◽  
pp. 108402
Author(s):  
Wenyang Xiao ◽  
Lei Tan
Keyword(s):  
Pressure Fluctuation ◽  
Design Method ◽  
Multiphase Pump ◽  
Velocity Moment

scholarly journals Phase Distribution in the Tip Clearance of a Multiphase Pump at Multiple Operating Points and Its Effect on the Pressure Fluctuation Intensity

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 556
Author(s):  
Guangtai Shi ◽  
Zongku Liu ◽  
Xiaobing Liu ◽  
Yexiang Xiao ◽  
Xuelin Tang
Keyword(s):  
Phase Velocity ◽  
Pressure Fluctuation ◽  
Phase Distribution ◽  
Tip Clearance ◽  
Tip Leakage Flow ◽  
Two Phase ◽  
Multiphase Pump ◽  
Fluctuation Intensity ◽  
Operating Points ◽  
Multiple Operating Points

Tip clearance has a great effect on the flow and pressure fluctuation characteristics in a multiphase pump, especially at multiple operating points. The phase distribution and pressure fluctuation in tip clearance in a multiphase pump are revealed using the CFD (computational fluid dynamics) technology and high-speed photography methods. In this paper, the phase distribution, the gas-liquid two-phase velocity slip, and the pressure fluctuation intensity are comprehensively analyzed. Results show with the increase of the tip clearance, the multiphase pump pressurization performance is obviously deteriorated. In the meantime, the gas accumulation mainly occurs at the hub, the blade suction side (SS), and the tip clearance, and the maximum gas-liquid two-phase velocity difference is near the impeller streamwise of 0.4. In addition, the tip clearance improves the gas-liquid two-phase distribution in the pump, that is, the larger the tip clearance is, the more uniform the gas-liquid distribution becomes. Furthermore, the gas leads to the maximum pressure fluctuation intensity in the tip clearance which is closer to the tip leakage flow (TLF) outlet, and has a greater effect on the degree of flow separation in the tip clearance.

scholarly journals Proposal of a stage-by-stage design method and its application on a multi-stage multiphase pump based on numerical simulations

2021 ◽  
Vol 13 (1) ◽  
pp. 168781402098731
Author(s):  
Yi Shi ◽  
Hongwu Zhu
Keyword(s):  
Volume Fraction ◽  
Design Method ◽  
Oil Field ◽  
Stage Design ◽  
Multiphase Pump ◽  
Flow Parameters ◽  
Multi Stage ◽  
Comparison Results ◽  
Third Stage ◽  
Gas Volume

Rotodynamic multiphase pumps are usually equipped with many compression units to provide sufficient boosting pressure for the transportation of production fluid in gas oil field. It is a challenge to maintain pump performance while flow parameters in each stage vary due to the compressibility of gas-liquid phase. In this article, a stage-by-stage design method is proposed to improve the boosting capability of a multiphase pump. Variations of flow parameters in each stage are investigated based on computational fluid dynamics (CFD) numerical simulation. Available methods to determinate main impeller geometry parameters of impeller are discussed. The stage-by-stage design method is applied on a five-stage multiphase pump when the inlet gas volume fraction (GVF) are 30% and 50% separately. The second stage is modified base on its corresponding inlet flow parameters when inlet GVF is 30% while the second and third stage are modified when inlet GVF is 50%. Flow parameters, pressure distribution and velocity distribution are compared between the original pump and modified pump. Differential pressure of the modified pump increases by 53.72 kPa and 58.57 kPa respectively when inlet GVFs are 30% and 50%. The feasibility of the stage-by-stage design method is verified through the comparison results.

scholarly journals 3D Blade Hydraulic Design Method of the Rotodynamic Multiphase Pump Impeller and Performance Research

2014 ◽  
Vol 6 ◽  
pp. 803972 ◽  
Author(s):  
Yongxue Zhang ◽  
Jinya Zhang ◽  
Hongwu Zhu ◽  
Shujie Cai
Keyword(s):  
Volume Fraction ◽  
Design Method ◽  
Three Dimensional ◽  
Bench Test ◽  
Pump Impeller ◽  
Multiphase Pump ◽  
Hydraulic Design ◽  
Gas Volume Fraction ◽  
And Performance ◽  
Gas Volume

A hydraulic design method of three-dimensional blade was presented to design the blades of the rotodynamic multiphase pump. Numerical simulations and bench test were conducted to investigate the performance of the example impeller designed by the presented method. The results obtained from the bench test were in good agreement with the simulation results, which indicated the reasonability of the simulation. The distributions of pressure and gas volume fraction were analyzed and the results showed that the designed impeller was good for the transportation of mixture composed of gas and liquid. In addition, the advantage of the impeller designed by the presented method was suitable for using in large volume rate conditions, which were reflected by the comparison of the head performance between this three-dimensional design method and another one.

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.

Numerical Analysis of Unsteady Flow in Centrifugal Pumps With Impellers Based on Different Hydraulic Design Principles

2010 ◽  
Author(s):  
Jianping Yuan ◽  
Hongqin He ◽  
Zhixia He ◽  
Shouqi Yuan
Keyword(s):  
Unsteady Flow ◽  
Centrifugal Pump ◽  
Pressure Fluctuation ◽  
Design Method ◽  
Outlet Section ◽  
Centrifugal Pumps ◽  
Lower Efficiency ◽  
Fluctuation Phenomenon ◽  
Low Specific Speed ◽  
Specific Speed

The centrifugal pump is one of the most widely used pumps. Lower efficiency, worse cavitation performance and stronger unsteady flow are three main problems for the low-specific-speed centrifugal pumps. Due to unsteady flow within pumps, pressure is fluctuant, which further induces vibration and noise. For a centrifugal pump with different impellers, its characteristics of unsteady flow are also different. In this paper, five different impellers were designed adopting low-specific-speed design method, splitter-blades design method and velocity-coefficient method with a set of performance parameters (Q = 25m3/h, H = 10m, n = 1450r/min). 3D unsteady turbulent flow field within the centrifugal pump was simulated. The periodic fluctuation phenomenon and the unsteady flow characteristics were investigated. The static pressure fluctuation in the volute and at the volute outlet and the instantaneous head changes were showed for the pumps with five different impellers operated at design and off-design conditions. The pressure fluctuation is the strongest near the tongue and is slighter at the volute outlet section. The transient head fluctuation increases with the flow rate. The transient head fluctuation of the pump with the low-specific-speed designed impeller is the biggest, while that of the pump with the normal-designed impeller is the smallest. Among the three splitter-blade impellers, the transient head fluctuation of the impeller with splitter blades leaned to the corresponding suction side of the long blades is the smallest. Eventually, the different design schemes were evaluated using the unsteady flow analysis. These conclusions from this paper can supply some references for the design of low-specific-speed centrifugal pumps considering its pressure fluctuation and flow-induced vibration and noise.

scholarly journals Experimental Investigation on Transient Pressure Characteristics in a Helico-Axial Multiphase Pump

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 461 ◽  
Author(s):  
Yun Xu ◽  
Shuliang Cao ◽  
Takeshi Sano ◽  
Tokiya Wakai ◽  
Martino Reclari
Keyword(s):  
Pressure Fluctuation ◽  
High Speed ◽  
Oil And Gas ◽  
High Efficiency ◽  
Phase Distribution ◽  
Pressure Rise ◽  
Stable Operation ◽  
Transient Pressure ◽  
Multiphase Pump ◽  
Pressure Characteristics

In oil and gas exploitation, the multiphase pump is a vital piece of equipment to guarantee production with high efficiency and stable operation. The complicated pattern of multiphase flow in the multiphase pump affects the pump performance; for this reason, the multiphase performance and the inner flow should be sufficiently investigated. In the present work, a liquid-gas multiphase pump is designed and manufactured, and then tested in a specialized test rig to reveal the transient pressure characteristics of the multiphase pump. Results show that the dominant frequency under water and water-air conditions is the blade passing frequency, which is induced by the rotor stator interaction. In the downstream of the impeller, the pressure fluctuation is obviously weakened, because the splitter-blade design could improve the control ability of flow pattern in the downstream region. In comparison with water condition, the pressure fluctuation of water-air condition greatly increases, and the multiples of impeller rotating frequency are stimulated due to the movement and merging of air bubbles. Finally, the correlation of transient pressure and phase distribution in impeller is revealed by using a high-speed camera. With the gradual pressure rise from impeller inlet to outlet, the relative movement and separation of two phases induce violent pressure fluctuations.

Pressure fluctuation characteristics in the pressurization unit of a multiphase pump

2021 ◽  
Vol 33 (6) ◽  
pp. 1230-1241
Author(s):  
Guang-tai Shi ◽  
Zong-ku Liu ◽  
Ye-xiang Xiao ◽  
Xue-lin Tang ◽  
Xiao-bing Liu
Keyword(s):  
Pressure Fluctuation ◽  
Multiphase Pump
Sign in / Sign up

Export Citation Format

Share Document