scholarly journals Flow Characteristics and Energy Loss within the Static Impeller of Multiphase Pump

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1025
Author(s):  
Zhu Jiang ◽  
Haiying Li ◽  
Guangtai Shi ◽  
Xiaobing Liu

The internal flow is very complex in the multiphase pump, especially in the static impeller, where the flow is more disorganized than that in the impeller wheel, and it will cause greater hydraulic losses. In order to investigate deeply the flow rules within the static impeller, all kinds of the flow losses are analyzed quantificationally in the multiphase pump. Based on the standard SST k-ω turbulence model, selected the helical axial flow multiphase pump as the research object, used the three-dimensional modeling software for the three-dimensional modeling of the flow through parts of the multiphase pump, such as impeller wheel, the static impeller, the suction chamber, and the extrusion chamber. The ANSYS software is used to simulate the three-dimensional flow in static impeller, and the ICEM software was used to divide the mesh of suction chamber, press outlet chamber, moving impeller and static impeller respectively. The results show that the flow within the impeller wheel is more uniform than the static impeller, and larger axial vortexes appear in the static impeller. Compared with the impeller wheel, the effect of the flow rate on the flow within the first static impeller is greater. The friction loss is the largest among all kinds of losses in the static impeller, followed by the turbulence dissipation loss. What’s more, the shock loss and the contraction loss are the smallest, they are all less than 20%, and the main loss within the static impeller are the turbulent dissipation loss and friction loss. The proportion of energy losses in the first and second static impeller is almost the same, which is around 50%, respectively. The results can be used as a reference for the improvement of the hydraulic performance of the multiphase pump.

2014 ◽  
Vol 700 ◽  
pp. 647-650
Author(s):  
Yun Long Zhang ◽  
Si Qing Zhang ◽  
Dong Wang ◽  
Dan Li

According to the CFD numerical simulation of hydraulic turbine internal flow and simulation calculation of vortex and cavitation of draft tube, and in the three dimensional modeling and analysis of the draft tube elbow is found that commonly modeling methods are tedious process, there is more deviations, not conducive to modify the part size and flow over a smooth. This article proposes a projective modeling method to avoid some drawbacks of traditional methods; the modeling process is convenient and concise, easy to modify the local size, flow more smoothly, and achieve more accurate simulation process.


Author(s):  
A. Agarkov ◽  
R. Sharapov

Various designs of inertial concentrators for cleaning dusty air are considered. The analyzed designs of devices for separating dust particles by fractions also have a number of disadvantages: low fractional efficiency and complexity of structures when divided into several fractions. The design of an inertial dust concentrator with adjustable parameters is proposed. This design of the concentrator provides an increase in fractional efficiency and a decrease in hydraulic resistance with the simplicity of the apparatus design. Three-dimensional modeling of the spatial motion of air in an inertial dust concentrator with adjustable parameters is performed. A system of equations describing gas-dynamic flows is given. The results of calculations of velocity and pressure in an inertial dust concentrator with adjustable parameters are presented. Reflecting vanes and a false wall inside an inertial concentrator act as deflectors, that is, deflect the flow, which leads to an increase in the time spent by suspended particles in the inertial concentrator and a decrease in their kinetic energy. In this case, the role of inertia forces on the motion of particles will increase. Numerical modeling of the three-dimensional air flow in the concentrator made it possible to obtain a flow pattern and the main flow characteristics (velocity and pressure) from the moment of air supply to the concentrator to the moment of establishing the flow.


2013 ◽  
Vol 712-715 ◽  
pp. 1910-1913 ◽  
Author(s):  
Jiang Hui Pei ◽  
Zhong Di Su ◽  
Kai Zhang

In order to optimize the structural design of gas turbine flowmeter sensor, numerical simulation of internal flow for gas turbine flowmeter is conducted with computational fluid dynamics method. The computation have been carried with three dimensional modeling, high quality grid resolution, dynamic grid technique and companying with the practical application of specical boundary condition.The detailed information of velocity distribution and meter factor of gas turbine flowmeter are obtained. Compared simulation results to experimental data, the relative errors are within 2.7%.


2011 ◽  
Vol 56 (3) ◽  
pp. 766-770 ◽  
Author(s):  
Delphine Tardivo ◽  
Julien Sastre ◽  
Michel Ruquet ◽  
Lionel Thollon ◽  
Pascal Adalian ◽  
...  

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