Numerical Simulation of Internal Flow Field in Mixed Flow Fan

2013 ◽  
Vol 860-863 ◽  
pp. 1589-1593
Author(s):  
Yan Zhao Zhai ◽  
Hong Ming Zhang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Velocity Distribution ◽  
Pressure Distribution ◽  
Three Dimensional ◽  
Internal Flow ◽  
Field Structure ◽  
Mixed Flow ◽  
Flow Phenomenon ◽  
Impeller Outlet

The numerical simulation of internal flow field of a mixed-flow fan was carried out on the star-CD platform. Three-dimensional steady turbulent flow is calculated using the standard k-ɛ turbulence model, and the pressure distribution, velocity distribution and other important flow phenomenon inside the fan are obtained. The number of meshes has important influence on the result, meanwhile, fan inlet, impeller, outlet interact with each other. The results of numerical simulation can accurately analyze the fan flow field. The results of numerical simulation can accurately analyze the fan flow field structure, and provide guidance for further optimization and improvement of the fan.

Numerical Simulation and Analysis of 3-D Internal Flow Field in Mechanical Turbulent Coal Pulverizer

2012 ◽  
Vol 170-173 ◽  
pp. 3300-3303
Author(s):  
Wei Lv ◽  
Zhi Yue Yao ◽  
De Li Zhang ◽  
Xin Hai Wang ◽  
Xiao Nan Zhang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Flow Field ◽  
Velocity Distribution ◽  
Secondary Flow ◽  
Eddy Current ◽  
Gas Flow ◽  
Internal Flow ◽  
Flow Phenomenon ◽  
Computation Fluid Dynamics

In this paper, the computation fluid dynamics ( CFD) software FLUENT is applied to analyze the internal 3-D gas flow of the mechanical turbulent coal pulverizer impeller, especially on the pressure and velocity distribution. Eddy current-wake and secondary flow phenomenon is found in the pulverizer.

Numerical simulation of three-dimensional airflow in a novel dual-feed rotor spinning box

2016 ◽  
Vol 88 (3) ◽  
pp. 237-253 ◽  
Author(s):  
Nicholus Tayari Akankwasa ◽  
Huiting Lin ◽  
Yuze Zhang ◽  
Jun Wang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Three Dimensional ◽  
Internal Flow ◽  
Velocity Variation ◽  
Positive Pressure ◽  
Three Dimensional Model ◽  
Air Velocity ◽  
Rotor Spinning ◽  
Pressure Profiles

In order to regulate turbulence strength and determine airflow characteristics in a new dual-feed rotor spinning unit, the internal flow field is investigated. A computational fluid dynamics technique is employed to numerically study the three-dimensional model of the internal airflow in the new design. The effects of air velocity variation on turbulence strength, negative pressure, Re, and wall pressure distribution are investigated based on simulation data and previous studies. The results show that the turbulence strength and Re increased with increase in inlet air velocity. Pressure profiles inside the rotor varied significantly with positive pressure observed at the channel exits. Minimal inlet velocity maintains the flow field in the rotor interior below 100 m/s, which gives the ideal turbulence required to minimize yarn quality deterioration. The dual-feed rotor spinning unit showed more orderly streamline patterns with fewer vortices compared to the conventional one. The numerical simulation can provide insights on airflow studies and some guidelines for future prototyping and experiments to further improve the new design.

The Numerical Simulation of the Flow Field in the Underground Hydrocyclone

2013 ◽  
Vol 655-657 ◽  
pp. 470-475
Author(s):  
Jing Chang Wang ◽  
Fu Lai Guo ◽  
Meng Hua Wu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Field Distribution ◽  
Phase Distribution ◽  
Three Dimensional ◽  
Internal Flow ◽  
No Formation ◽  
The Media ◽  
Solid Liquid ◽  
Air Column

For preventing sand in underground oil, this paper structures a model of hydrocyclone with the inside cyclone and the outside one seriesing and describes how it works. By the TGrid procedures, the all of the hydrocyclone is meshed with the tetrahedral and the boundary conditions are determined. The methods of Three-dimensional numerical simulation in FLUENT are used to simulate the velocity field distribution, the pressure field distribution, the path lines of the separated medition characteristics of the separated medium and the phase distribution of the medium. The affect of the internal separated medition characteristics to the separated performance is analysed. Through the simulation, it is found that the spiral fin in the hydrocyclone can guide the fluid to produce a vortex flow to meet the purpose of separating the solid-liquid. There is no formation of the air column comparing with the conventional cyclone, so the internal flow field is more stable to conductive to the separation of the media. It provides a basis for the improvement of the cyclone.

Numerical Simulation on Flow Field of Screen Filter for Drip Irrigation in Field

2012 ◽  
Vol 212-213 ◽  
pp. 1197-1200 ◽  
Author(s):  
Quan Li Zong ◽  
Tie Gand Zheng
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Velocity Distribution ◽  
Pressure Distribution ◽  
Drip Irrigation ◽  
Radial Direction ◽  
Turbulent Energy ◽  
Head Loss ◽  
Turbulent Pressure ◽  
High Turbulence

Based on CFD software Fluent, the flow field of screen filter was simulated numerically，and the results of calculation were analyzed in detailed. The results show that the velocity distribution declines along the radial direction of tank. The flow can be rotated and mixed in tank, and the screen of outlet can be clogged quickly resulting in uneven clogging. The turbulent pressure distribution of filter is not uniformity. In the inlet, the turbulent energy is larger than the second tank. In the inlet of second screen, there is a high turbulence region resulting in the larger head loss. The pressure distribution of the second tank is uniformity in the course of filter work. However, the pressure of the first tank is significantly higher than the second one.

On the Design Criteria for Suppression of Secondary Flows in Centrifugal and Mixed Flow Impellers

1998 ◽  
Vol 120 (4) ◽  
pp. 723-735 ◽  
Author(s):  
M. Zangeneh ◽  
A. Goto ◽  
H. Harada
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Centrifugal Compressor ◽  
Design Method ◽  
Three Dimensional ◽  
Design Guidelines ◽  
Secondary Flows ◽  
Mixed Flow ◽  
Optimum Pressure ◽  
Specific Speed

In this paper, for the first time, a set of guidelines is presented for the systematic design of mixed flow and centrifugal compressors and pumps with suppressed secondary flows and a uniform exit flow field. The paper describes the shape of the optimum pressure distribution for the suppression of secondary flows in the impeller with reference to classical secondary flow theory. The feasibility of achieving this pressure distribution is then demonstrated by deriving guidelines for the design specifications of a three-dimensional inverse design method, in which the blades are designed subject to a specified circulation distribution or 2πrVθ. The guidelines will define the optimum choice of the blade loading or ∂rVθ/∂m and the stacking condition for the blades. These guidelines are then used in the design of three different low specific speed centrifugal pump impellers and a high specific speed industrial centrifugal compressor impellers. The flows through all the designed impellers are computed numerically by a three-dimensional viscous code and the resulting flow field is compared to that obtained in the corresponding conventional impeller. The results show consistent suppression of secondary flows in all cases. The design guidelines are validated experimentally by comparing the performance of the inverse designed centrifugal compressor impeller with the corresponding conventional impeller. The overall performance of the stage with the inverse designed impeller with suppressed secondary flows was found to be 5 percent higher than the conventional impeller at the peak efficiency point. Exit flow traverse results at the impeller exit indicate a more uniform exit flow than that measured at the exit from the conventional impeller.

scholarly journals The Unsteady Numerical Simulation and Fluid-Structure Interaction Analysis of TLB600-700 Desulphurization Pump

2014 ◽  
Vol 6 ◽  
pp. 191697
Author(s):  
Xiaoke He ◽  
Jianrui Liu ◽  
Dengpeng Fu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Design Method ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Internal Flow ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Design Requirements ◽  
Unsteady Numerical Simulation

Based on the design theory of liquid-solid two-phase flow centrifugal pump, a new type TLB600-700 desulphurization pump was designed with huge distortions blades design method and impeller inlet super long extension blades design method. Three-dimensional model of internal flow field in TLB600-700 desulphurization pump was built by software PROE5.0, and the three-dimensional unsteady numerical simulation of the internal flow field was calculated, which revealed that the rotor-stator interaction between rotating impeller and volute is the reason why unstable flow generated. Statics analysis was carried out on the impeller in the stationary flow state with the method of fluid-structure interaction, and results indicated that the impeller strength and stiffness meet the design requirements. External characteristic test results of TLB600-700 desulphurization pump showed that all parameters of desulphurization pump designed by innovative method meet design requirements; especially the pump efficiency was increased by 4.15% higher than Chinese national standard.

Three-dimensional flow field numerical simulation and performance analysis for a new type canned motor pump

2013 ◽  
Vol 227 (12) ◽  
pp. 2825-2833 ◽  
Author(s):  
Cui Jianzhong ◽  
Xie Fangwei ◽  
Liu Qingyun ◽  
Wang Cuntang ◽  
Zhang Xianjun ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Three Dimensional ◽  
Internal Flow ◽  
Outer Diameter ◽  
Small Flow ◽  
New Type ◽  
Fluent Software ◽  
And Performance ◽  
Canned Motor

A new type of canned motor pump with extensive application value is designed, researched, and developed in this article. In order to grasp the characteristic of the internal flow field of the pump, the internal flow field is simulated numerically by using FLUENT software with the standard k–ɛ turbulence model, SIMPLEC algorithm, and multiple reference frame model. The distribution of the pressure and velocity of the flow in the canned motor pump is analyzed in different working conditions. Moreover, the head and efficiency of the pump is predicted based on the simulation results, which show that the head and efficiency of the canned motor pump in small flow rate will be better. The performance of the canned motor pump can be improved by appropriately increasing the outer diameter of the impeller and the base diameter of the volute. The results of the numerical simulation are in accord with theoretical analysis, which verifies the correctness of the numerical simulation. The investigations have important theoretical guiding significance for the design of the canned motor pump.

scholarly journals Separation Characteristics of an Axial Hydrocyclone Separator

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2288
Author(s):  
Jie Kou ◽  
Zhaoming Jiang ◽  
Yiying Cong
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Velocity Distribution ◽  
Pressure Distribution ◽  
Concentration Distribution ◽  
Guide Vane ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Tangential Inlet

An innovative axial hydrocyclone separator was designed in which a guide vane was installed to replace a conventional tangential inlet, potentially aggravating inlet turbulence. The characteristics of velocity distribution, concentration distribution, and pressure distribution inside the separator were obtained through the numerical simulation of the turbulent flow of oil and water. The results showed that the flow field presented good symmetry, which eliminated the eccentric turbulence phenomenon in the conventional hydrocyclone separators and was beneficial for the oil–water separation.

Numerical Simulation on Disk Rotating Detonation Engine: Influence of Internal Flow Field Structure on Performance

2020 ◽  
Author(s):  
Tomohiro Watanabe ◽  
Nicolas H. Jourdaine ◽  
Kohei Ozawa ◽  
Nobuyuki Tsuboi ◽  
Takayuki Kojima ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Internal Flow ◽  
Field Structure ◽  
Rotating Detonation Engine ◽  
Detonation Engine ◽  
Rotating Detonation

Effect of Inlet Prewhirl on Flow Field of Axial Flow Fan

2013 ◽  
Vol 732-733 ◽  
pp. 571-576
Author(s):  
Zhou Ye ◽  
Hai Yang Zhao ◽  
Yang Yang ◽  
Chun Li ◽  
Wei Gao
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Flow Rate ◽  
Flow Separation ◽  
Central Area ◽  
Axial Flow ◽  
Internal Flow ◽  
Field Structure ◽  
Suction Surface ◽  
Flow Loss

The flow in a single-stage fan is analyzed through numerical simulation. The results indicate that there exists a best prewhirl angle which can make flow loss minimal at a given flow rate. So we can improve the internal flow field structure by changing the prewhirl angle, thus the fan efficiency can be raised. In addition, the flow separation on the suction surface is sensitive to the variation of the prewhirl angle. The range of the separation on suction surface increases with the decrease of the prewhirl angle, and expands to the central area of the blades.

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