Simulation Analysis on Interior Flow Field of Recoil Brake Based on Dynamic Mesh

2013 ◽  
Vol 765-767 ◽  
pp. 427-430
Author(s):  
Ye Zun Sun ◽  
Jun Qi Qin ◽  
Chang Chun Di ◽  
Kai Bo Cui ◽  
Yan Wang
Keyword(s):  
Flow Field ◽  
Computational Model ◽  
Optimization Design ◽  
Simulation Analysis ◽  
Internal Flow ◽  
Fault Analysis ◽  
Dynamic Mesh ◽  
Actual Structure ◽  
Theoretical Support ◽  
Core Components

Recoil brake is one of the core components of the artillery. It plays a main buffer role in artillery firing. Its internal flow is very complex, so the traditional one-dimensional computational model can not reflect the characteristics of internal flow field fully and accurately. Two-dimensional computational model of the recoil brake with actual structure was proposed based on dynamic mesh technology. Using dynamic layering method, the movement of dynamic grid was driven by Profile file. The data of Profile file was obtained from experiment measured of artillery recoil. Simulation of the flow field of recoil brake accurately was achieved. Pressure, speed and other data were got by simulation. It also reveals the laws of liquid flow and can provide theoretical support for fault analysis and optimization design.

Numerical Simulation on Internal Flow Field of Rolling Bearing under Oil-Air Lubrication

2012 ◽  
Vol 271-272 ◽  
pp. 1056-1061 ◽  
Author(s):  
Bao Hong Tong ◽  
Xiao Qian Sun ◽  
Hong Su
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Optimization Design ◽  
Heat Dissipation ◽  
Simulation Analysis ◽  
Roller Bearing ◽  
Internal Flow ◽  
Rolling Bearing ◽  
Flow State ◽  
Air Lubrication

Heat dissipation and working efficiency of transport air in rolling bearing under oil-air lubrication are closely related to the flowing state of oil-air in bearing chamber. For cylindrical roller bearing NF211, numerical simulation model of oil-air flow field in bearing chamber was established combining with the practical structure features of rolling bearing and ignoring the effect caused by roller rotation. Combining with flow field numerical simulation functions of Fluent software, simulation analysis of the flow state in bearing chamber were carried out. Based on k-ε turbulent model, three-dimensional flow field in the bearing chamber and main feature parameters of inner flow were got analyzed carefully considering the effect of twirling. Comparing with the numerical simulation of simplified flow field, it showed that energy dissipation and axial velocity of the air were influenced by the effect of twirling distinctly. Simulation results were expected to give useful references for the optimization design of the oil-air lubrication system in rolling bearing.

Precision Compound Sand Control Screen Internal Flow Field of the CFD Simulation

2014 ◽  
Vol 644-650 ◽  
pp. 4682-4685
Author(s):  
Zhi Jian Wang ◽  
Tian Zhu Zhang ◽  
Jin Shang ◽  
Metsakeu Kong Evariste
Keyword(s):  
Flow Field ◽  
Cfd Simulation ◽  
Internal Flow ◽  
Screen Effect ◽  
Theoretical Support ◽  
Sand Control ◽  
Porous Media Model ◽  
Speed Change ◽  
Cfd Method ◽  
Production Losses

In this paper, calculating fluid dynamics (CFD) method is utilized for analyzing the precision compound sand control screen internal flow field so as to establish appropriate models. During this numerical calculation, by using the - turbulence model is used to simulate the resistance characteristics under different working conditions when crude oil flows through precision compound sand control screen, analyze its speed change rule, flow path and pressure distribution, etc. The use of porous media model to simulate the resistance of the oil screen effect, the oil screen is replaced by the porous jump surface to simulate the strainer of pressure drop. To screen sand control performance and reduce the flow resistance to provide theoretical support, make the reservoir production losses to a minimum.

Flow Field Analysis and Structure Optimization of Water Hydraulic Poppet Valve Based on the CFD

2013 ◽  
Vol 791-793 ◽  
pp. 734-737 ◽  
Author(s):  
Qiu Xia ◽  
Xiang Pan Guang
Keyword(s):  
Flow Field ◽  
Simulation Analysis ◽  
Internal Flow ◽  
Turbulent Energy ◽  
Field Analysis ◽  
Value Differences ◽  
Poppet Valve ◽  
Traditional Structure ◽  
Fluent Software ◽  
Water Hydraulic

This paper builds two water hydraulic poppet valve models which are of different structure, and simulation analysis used by FLUENT software on it’s internal flow field. The analysis results show that, after improving the structure of water hydraulic poppet valve, import and export pressure value differences decreased, effectively restrains the generation of cavitation, reduces the vibration amplitude and turn down noise, reduces loss of turbulent energy, the overall performance is superior to the traditional structure.

Particles Separation of Hydrocyclone Based on CFD Simulation

2014 ◽  
Vol 535 ◽  
pp. 495-499
Author(s):  
Jing Song ◽  
Wei He ◽  
Zhe Kun Li ◽  
Wen Li Shi
Keyword(s):  
Flow Field ◽  
Optimization Design ◽  
Cfd Simulation ◽  
Internal Flow ◽  
Structure Design ◽  
Separation Performance ◽  
Flow Field Simulation ◽  
Research Status ◽  
Field Simulation

Analyzed the research status of hydrocyclone separation. By using CFD software, the important parameters of velocity and pressure in the hydrocyclone are analyzed and contrasted. Through simulation, it can accurately reflect the internal flow field, and can be used to predict the hydrocyclone separation performance. The results of flow field simulation will help to finish structure design of hydrocyclone and to provide the basis for the optimization design of hydrocyclone.

Multi-objective optimization design for a hydrodynamic retarder based on CFD simulation considering cavitation effect

2021 ◽  
pp. 095440622110145
Author(s):  
Konghua Yang ◽  
Chunbao Liu ◽  
Qingtao Wu ◽  
Xuesong Li
Keyword(s):  
Flow Field ◽  
Optimization Design ◽  
Cfd Simulation ◽  
Internal Flow ◽  
Structure Design ◽  
Multi Objective Optimization ◽  
Hexahedral Mesh ◽  
Nsga Ii ◽  
Multi Objective ◽  
Cavitation Effect

It is important to suppress cavitation phenomenon for lower vibration and noise, which can be realized by structure optimization to reduce cavitation bubbles of flow field. Nonetheless, performance factors in hydrodynamic retarder are usually conflicted when conducting a structure design, it is hard to simultaneously restrain cavitation and improve the retarding performance. In our study, a combination of comprehensive CFD simulation and multi-objective optimization is developed to improve the retarding torque ([Formula: see text]), lessen the volume of Retarder ([Formula: see text]) and reduce the volume of bubbles ([Formula: see text]) in the internal flow field. First, the elaborate CFD simulation calculation, included a refined hexahedral mesh and the stress-blended eddy simulation (SBES), is proposed to investigate the unsteady flow field considering the cavitation, and its accuracy is validated by experimental data. Then, the RSM (Respond Surface Method) approximation model is constructed by combination of DOE (Design of Method) and CFD methods. The NSGA-II (Non-Dominated Sorting Genetic Algorithm) is selected as multi-objective optimization algorithm, and the weight and scale factor of each sub objective are specified. The optimization results, verified by theoretical calculation, show that [Formula: see text] is increased by 22%–24%, [Formula: see text] is reduced by 32%–45% and [Formula: see text] is reduced by 1%. Furthermore, the comparison of the vortex distributions before and after optimization demonstrates that the optimization improves the flow field impact and pressure loss in the retarder and reduces the number of bubbles resulting in the increasing vortex. Additionally, parameters’ effect on the cavitation and the braking performance are analyzed to efficiently achieve the best comprehensive performance of the retarder design. The newly-developed optimization method, which can understand the optimization principle and guide a balance between the cavitation and the retarding performance improvement, will reduce huge trial cost and time cost in the manufacture.

Study on Numerical Simulation of Internal Flow Fields in the New-Type

2014 ◽  
Vol 507 ◽  
pp. 869-873
Author(s):  
Lei Zhang ◽  
Ming Li ◽  
Yong Yao
Keyword(s):  
Flow Field ◽  
Flue Gas ◽  
Optimization Design ◽  
Gas Flow ◽  
Dynamic Pressure ◽  
Three Dimensional ◽  
Tangential Velocity ◽  
Internal Flow ◽  
Turbulence Flow ◽  
New Type

This paper uses Reynolds stress equation turbulence model (RSM) to simulate the flue gas flow field in the new-type stack, and analyzes the velocity field and pressure field of its three-dimensional strong spiral turbulence flow field. It gets the distribution characteristics of tangential velocity, axial velocity, static pressure, dynamic pressure and total pressure in the internal flow field of the new-type stack, thus provides reference to the research and optimization design of the flow mechanism..

Experiment and Optimization of Settling Effect of Drip Streaming Filter

2014 ◽  
Vol 620 ◽  
pp. 246-253
Author(s):  
Su Zhen Wu ◽  
Han Song Yang
Keyword(s):  
Flow Field ◽  
Flow Rate ◽  
Simulation Analysis ◽  
Structural Parameters ◽  
Internal Flow ◽  
Tube Insertion ◽  
Insertion Depth ◽  
Sediment Production ◽  
Fluent Software ◽  
The Relationship

In this thesis, by changing the filter overflow tube insertion depth of spin streaming filter, combined with the existing drip irrigation equipment change the structure parameters of spin streaming filter. Using Fluent software to choose reasonable turbulence model for numerical simulation analysis, contrastive research on the field test was carried on, reveals the relationship between the internal flow field pressure and the flow rate. The sediment production increased before they are reduced with the increase of the overflow tube insertion depth. It should choose the optimal insertion depth according to the specific use and usage model of hydrocyclone in actually use. The variation trend of internal flow field pressure and the flow rate when selected structural parameters changed are also analyzed. With the increase of insertion depth, the axial velocity and radial velocity of sand and water inside the hydrocyclone shows the tendency of decrease. Furthermore, the field experiment verifies the simulation result, thus proving the feasibility of using Fluent computational fluid dynamics software to simulate the internal flow field of the spin streaming filter. The research results will provide referential basis for the design and application of the drip filter system.

The CFD Analysis of Internal Flow Field in Turbocharger Compressor

2014 ◽  
Vol 628 ◽  
pp. 279-282 ◽  
Author(s):  
Xiang Ling Liu ◽  
Liao Ping Hu ◽  
Jin Ke Gong ◽  
Jia Qiang E
Keyword(s):  
Flow Field ◽  
Optimization Design ◽  
Gasoline Engine ◽  
Flow Analysis ◽  
Internal Flow ◽  
Field Analysis ◽  
Analysis Model ◽  
Vaneless Diffuser ◽  
Flow Field Analysis ◽  
Cfd Method

In this paper, the 3D flow analysis model of gasoline engine turbocharger compressor was built by using the software NUMECA. The flow fields of the vaneless diffuser and volute, such as airflow velocity field, temperature field, pressure field and the entropy field were simulated. The internal flow performance of the vaneless diffuser and volute were analyzed. The simulation results show that the field changes accord with the compressor characteristics, thus the vaneless diffuser and volute of the compressor design is reasonable. The approach of numerical simulation and flow field analysis by using CFD method can accurately predict the compressor performance. The research methods and conclusions provide theoretical and practical reference for the optimization design of the compressor.

Flow Filed Simulation Analysis and Structural Optimization of Automotive Catalytic Converter

2014 ◽  
Vol 945-949 ◽  
pp. 899-903
Author(s):  
Tian Zhong Sui ◽  
Lei Wang ◽  
Yang Wang
Keyword(s):  
Flow Field ◽  
Structural Optimization ◽  
Simulation Analysis ◽  
Catalytic Converter ◽  
Exhaust System ◽  
Internal Flow ◽  
Simulation Method ◽  
Flow Uniformity ◽  
Engine Exhaust ◽  
Set Up

Catalytic converter is an important device of automobile engine exhaust system. Based on Hydromechanics, the relational mathematical models of catalytic converter simulation are established and the parameters are calculated. Making use of CFD numerical simulation method, a simulation is set up for the internal flow field of catalytic converter original model using fluent software. From the simulation, the internal flow characteristic is understood. On the basis of this, through the optimization idea adding a guiding device in inlet cone of catalytic converter, the uniformity of velocity of flow is improved. The simulation analysis show that the flow uniformity for internal flow field can be improved observably in the structural optimization, the increasing degree of pressure loss is with little range. A new idea and reference may be offered for improving flow uniformity of a catalytic converter.

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