Modeling and Numerical Simulation Analysis of Chemical Plume in Flow Field

2014 ◽  
Vol 971-973 ◽  
pp. 93-97
Author(s):  
Xiang Yao Meng ◽  
Zhi Ming Qiu ◽  
Peng Zhang
Keyword(s):  
Flow Field ◽  
Transport Process ◽  
Theoretical Basis ◽  
Simulation Analysis ◽  
Current Model ◽  
Chemical Substances ◽  
Plume Tracking ◽  
Discrete Phase ◽  
Simulation Results ◽  
Chemical Plume

A new discrete chemical plume model based on CFD was established, which avoids the shortcomings of the current model. In this model CFD was applied to simulate the turbulent environment of chemical plume, while the chemical substances contained in the plume were modeled as discrete phase. Utilizing this model, chemical plume under water was simulated numerically and analyzed hereafter. The transport characteristics of simulated plume were consistent with existing experimental results. Based on the simulation results, the effect of flow field on plume transport was also analyzed. The model proves an efficient approach to simulate the transport process in different environment, as well as analyze various types of actual situations. Moreover, this model can provide the theoretical basis for plume tracking algorithm research and simulation platform, which promotes significantly the research on chemical plume tracking.

Research on Flow Field Characteristics of Whole-Quantity-Type Safety Valve

2013 ◽  
Vol 427-429 ◽  
pp. 302-307
Author(s):  
S.H. Zou ◽  
J. Zhang ◽  
L. Gao ◽  
H. Gao ◽  
Ya Ping Wang
Keyword(s):  
Fault Diagnosis ◽  
Flow Field ◽  
Theoretical Basis ◽  
Safety Valve ◽  
Test System ◽  
Experimental Results ◽  
Type Safety ◽  
Flow Field Characteristics ◽  
Simulation Results ◽  
Structural Innovation

Emulate and analyze the flow field of whole-quantity-type safety valve using CFX. Establish the test system of whole-quantity-type safety valve. Compare the simulation results and the experimental results. Verify the accuracy of the simulation results. Provide a theoretical basis for structural innovation and fault diagnosis of whole-quantity-type safety valve.

Influence of Regulating Seam on Aerodynamic Characteristics of Virtual Wind Tunnel

2013 ◽  
Vol 774-776 ◽  
pp. 290-294
Author(s):  
Xing Jun Hu ◽  
Lei Yue
Keyword(s):  
Numerical Simulation ◽  
Wind Tunnel ◽  
Flow Field ◽  
Theoretical Basis ◽  
Aerodynamic Characteristics ◽  
Wind Tunnel Model ◽  
Open Type ◽  
Car Model ◽  
Tunnel Model ◽  
Simulation Results

A digital car model was taken as study object, and the influence of the regulating seam to an open type automobile wind tunnel was discussed by comparing simulation results with test data.The results show that the regulating seam changes the flow field around the collector, reduces the size of unsteady flow field and the flow in test section is uniformed better. Thus, the regulating seam shouldn’t be removed when simplifying the wind tunnel model in the simulation. This conclusion will provide theoretical basis and data support for better virtual reproduction and numerical simulation of a wind tunnel.

Finite-Element Comparative Analysis of Two Kinds of Meshing Rotor

2012 ◽  
Vol 501 ◽  
pp. 16-21
Author(s):  
Chuan Sheng Wang ◽  
Wei Shuai Lv ◽  
Hui Guang Bian
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Optimal Design ◽  
Flow Field ◽  
Transient Flow ◽  
Simulation Analysis ◽  
Analysis Process ◽  
Different Types ◽  
Simulation Results ◽  
Internal Mixer

This paper mainly introduces two kinds of internal mixer rotor. The professional visco-elastic fluid software--Polyflow is used to obtain dynamic simulation analysis process of the two different types of meshing rotors. The transient flow field model’s simulation results of the two intermeshing rotors which have rotated for 180 seconds are used to analyze the performance of the two rotors. And these analyses can be theoretical references for optimal design of the rotor.

The CFD Simulation Analysis on Flow Field of Array Ultrasonic Atomizing Nozzle Coating System

2013 ◽  
Vol 328 ◽  
pp. 1000-1003
Author(s):  
Yu Lieh Wu ◽  
Szo Tso Li ◽  
Wang Lin Liu ◽  
Pei Kun Lin
Keyword(s):  
Flow Field ◽  
Flat Plate ◽  
Cfd Simulation ◽  
Simulation Analysis ◽  
Operating Parameter ◽  
Spray Coating ◽  
Coating System ◽  
Large Area ◽  
The Mean ◽  
Simulation Results

This study aims at the array ultrasonic nozzle sprayed atomization flow field on flat plate, and uses different design and operating parameter combinations to analyze the distribution of spray flow field, the analytic results can be used to improve the flat plate coating performance of the array ultrasonic nozzle spraying equipment. The simulation analysis results will be compared and validated by practical spray coating experiment, so as to determine the reliability of simulation to implement the spray flow field simulation technique for large area uniform spray coating. The mean error value is less than 24%, proving that the simulation results have certain feasibility and accuracy.

Simulation Analysis and Design of Intake Restrictor of FSAE Race Car

2014 ◽  
Vol 602-605 ◽  
pp. 751-756
Author(s):  
Chu Wei Chen ◽  
Wei Du ◽  
Jia Qi Sun ◽  
Wei Liu ◽  
Yuan Chang ◽  
...  
Keyword(s):  
Optimal Design ◽  
Flow Field ◽  
Pressure Difference ◽  
Simulation Analysis ◽  
Optimal Scheme ◽  
Analysis And Design ◽  
Race Car ◽  
Half Angle ◽  
Outlet Flow ◽  
Simulation Results

For the intake restrictors which are designed in line with FSAE race stipulations, this paper carries out compute simulation on the convergent section and divergent section of the intake restrictors via CFD software; the paper systemically analyzes the distribution characters of its flow field, thus obtaining optimal design scheme. It finds through simulation that: when the converging half angle of the restrictor is less than 45°, the outlet flow of the restrictor will decrease as the converging half angle increases; meanwhile, the divergence half angle will affect the outlet flow of the restrictor as the pressure difference between the restrictor inlet and outlet varies. According to the simulation results, the optimal scheme finally designed is: the intake restrictor has the best effect when the converging half angle of the restrictor is 10°, while the divergence half angle is 11°.

Sensitivity Analysis in Transient Rotor Current Model and Control of DFIG during Voltage Sags

2013 ◽  
Vol 722 ◽  
pp. 147-152
Author(s):  
Ying Wang ◽  
Zhi Ce Zou ◽  
Xian Yong Xiao
Keyword(s):  
Sensitivity Analysis ◽  
Theoretical Basis ◽  
Low Voltage ◽  
Current Model ◽  
Voltage Sags ◽  
Transient Characteristic ◽  
Low Voltage Ride Through ◽  
Simulation Results ◽  
And Control ◽  
Influence Degree

The purposes to improve low voltage ride through (LVRT) capability of double-fed induction generator (DFIG) is to reduce rotor over-current during voltage sags. The rotor transient characteristic and its influencing factors are considered. The transient rotor current model is studied in detail. Then, the influencing degrees of structural and state parameters are determined. By sensitivity analysis, the influence degree is evaluated quantitatively. The simulation results have shown that the proposed method can provide theoretical basis to improve LVRT capability of DFIG..

The Criterion of Red Blood Cell’s Fragmentation and the Turbulent Flow Field Simulation Analysis in the High-Speed Spiral Blood Pump

2011 ◽  
Vol 422 ◽  
pp. 767-770
Author(s):  
Zhong Yun ◽  
Xiao Yan Tang ◽  
Chuang Xiang ◽  
Fen Shi
Keyword(s):  
Flow Field ◽  
Turbulent Flow ◽  
High Speed ◽  
Cfd Simulation ◽  
Simulation Analysis ◽  
Internal Flow ◽  
Blood Pump ◽  
Important Index ◽  
Simulation Results ◽  
Turbulent Flow Field

For a blood pump, the injury to blood is a very important index of its performance. The strongly swirling turbulent flow in the internal flow field of a high-speed spiral blood pump(HSBP), is one of important factors leading to the fragmentation of the red blood cell(RBC) and the hemolysis. The study on the turbulent injure principle of blood in the HSBP is carried out by using the theory of the turbulent flow field and the hemorheology. The determinant gist on RBC turbulent fragmentation is obtained. The turbulent flow in the designed HSBP have been simulated and analyzed by using the multiphase suspend body CFD simulation technology. The simulation results indicate that the turbulence in the designed HSBP can meet the requirements of blood physiology.

scholarly journals Optimizing Transmit Sequence and Instrumental Variables Receiver for Dual-Function Complexity System

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yu Yao ◽  
Junhui Zhao ◽  
Lenan Wu
Keyword(s):  
Approximate Solution ◽  
Instrumental Variables ◽  
Performance Index ◽  
Dual Function ◽  
Np Hard ◽  
Match Filter ◽  
Filter Output ◽  
Phase Code ◽  
Discrete Phase ◽  
Simulation Results

This correspondence deals with the joint cognitive design of transmit coded sequences and instrumental variables (IV) receive filter to enhance the performance of a dual-function radar-communication (DFRC) system in the presence of clutter disturbance. The IV receiver can reject clutter more efficiently than the match filter. The signal-to-clutter-and-noise ratio (SCNR) of the IV filter output is viewed as the performance index of the complexity system. We focus on phase only sequences, sharing both a continuous and a discrete phase code and develop optimization algorithms to achieve reasonable pairs of transmit coded sequences and IV receiver that fine approximate the behavior of the optimum SCNR. All iterations involve the solution of NP-hard quadratic fractional problems. The relaxation plus randomization technique is used to find an approximate solution. The complexity, corresponding to the operation of the proposed algorithms, depends on the number of acceptable iterations along with on and the complexity involved in all iterations. Simulation results are offered to evaluate the performance generated by the proposed scheme.

scholarly journals Effects of Blade Parameters on the Flow Field and Classification Performance of the Vertical Roller Mill via Numerical Investigations

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Chang Liu ◽  
Zuobing Chen ◽  
Weili Zhang ◽  
Chenggang Yang ◽  
Ya Mao ◽  
...  
Keyword(s):  
Flow Field ◽  
Pressure Difference ◽  
Continuous Phase ◽  
Classification Performance ◽  
Field Analysis ◽  
Discrete Phase Model ◽  
Roller Mill ◽  
Discrete Phase ◽  
Vertical Roller ◽  
Classification Efficiency

The vertical roller mill is an important crushing and grading screening device widely used in many industries. Its classification efficiency and the pressure difference determine the entire producing capacity and power consumption, respectively, which makes them the two key indicators describing the mill performance. Based on the DPM (Discrete Phase Model) and continuous phase coupling model, the flow field characteristics in the vertical roller mill including the velocity and pressure fields and the discrete phase distributions had been analyzed. The influence of blade parameters like the shape, number, and rotating speed on the flow field and classification performance had also been comprehensively explored. The numerical simulations showed that there are vortices in many zones in the mill and the blades are of great significance to the mill performance. The blade IV not only results in high classification efficiency but also reduces effectively the pressure difference in the separator and also the whole machine. The conclusions of the flow field analysis and the blade effects on the classification efficiency and the pressure difference could guide designing and optimizing the equipment structure and the milling process, which is of great importance to obtain better overall performance of the vertical roller mill.

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