Effects of structural parameters and rigidity of driving diaphragm on flow characteristics of micro valveless pump

2003 ◽  
Vol 4 (1) ◽  
pp. 53 ◽  
Author(s):  
Hai-bo XIE
Keyword(s):  
Structural Parameters ◽  
Flow Characteristics ◽  
Valveless Pump

The Sensitivity of Inner Nozzle Flow in Gasoline Direct Injection Injector to the Nozzle Geometry Parameters

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Xinhai Li ◽  
Yong Cheng ◽  
Xiaoyan Ma ◽  
Xue Yang
Keyword(s):  
Structural Parameters ◽  
Direct Injection ◽  
Large Diameter ◽  
Small Diameter ◽  
Flow Characteristics ◽  
Gasoline Direct Injection ◽  
Nozzle Geometry ◽  
Nozzle Flow ◽  
Nozzle Length ◽  
Injector Nozzle

The inner-flow of gasoline direct injection (GDI) injector nozzles plays an important role in the process of spray, and affects the mixture process in gasoline engine cylinder. The nozzle structure also affects the inner-flow of GDI injector. In order to obtain uniform performance of GDI injector, the size consistency of injector nozzle should be ensured. This paper researches the effect of nozzle length and diameter on the inner flow and analyzes the sensitivity of inner flow characteristics to these structural parameters. First, this paper reveals the process of inception, development, and saturated condition of cavitation phenomenon in injector nozzle. Second, the inner-nozzle flow characteristics are more sensitive to small diameter than large diameter under the short nozzle length, while the sensitivity of the inner-nozzle flow characteristics to large nozzle diameter becomes strong as the increase of the nozzle length. Finally, the influence of nozzle angle on the injection mass flow is studied, and the single nozzle fuel mass will increase as the decrease of nozzle angle α. And the sensitivity of inner-flow characteristic to nozzle angle becomes strong as the decrease of α.

Study on the Resistance of Structural Optimization of Pipeline Elbow in Civil Engineering

2012 ◽  
Vol 568 ◽  
pp. 119-124
Author(s):  
Hong Mei Sun ◽  
Zhi Long Zan
Keyword(s):  
Structural Optimization ◽  
Civil Engineering ◽  
Structural Parameters ◽  
Flow Characteristics ◽  
Engineering Structures ◽  
Pipe System ◽  
Pipe Elbow ◽  
Civil Engineering Structures

In the pipe system of infusion, elbow is widely applied in Civil Engineering Structures based on structure materials.This paper studies a new infusion of the pipe elbow. Calculated and analyzed resistance of different structural parameters deflector is on the effect of flow characteristics.

Numerical study of structural parameters influencing flow in a lunular valveless pump

2021 ◽  
Vol 92 (2) ◽  
pp. 025009
Author(s):  
Lipeng He ◽  
Zheng Zhang ◽  
Yongjun Miao ◽  
Da Zhao ◽  
Xiaoqiang Wu ◽  
...  
Keyword(s):  
Numerical Study ◽  
Structural Parameters ◽  
Valveless Pump

Research on the Influence Factors of Cavitating Jet in Jet Pipe Amplifier Nozzle

2012 ◽  
Vol 229-231 ◽  
pp. 617-620
Author(s):  
Xin Hua Wang ◽  
Zhi Jie Li ◽  
Shu Wen Sun ◽  
Gang Zheng
Keyword(s):  
Fluid Dynamics ◽  
Structural Parameters ◽  
Influence Factors ◽  
Flow Characteristics ◽  
Operating Parameters ◽  
Cavitation Flow ◽  
Outlet Pressure ◽  
Computational Fluid Dynamics Cfd ◽  
Water Nozzle ◽  
Cavitating Jet

The cavitation flow characteristics in jet pipe amplifier with different nozzles were simulated using commercial computational fluid dynamics (CFD) software. The influence of operating parameters and structural parameters of jet nozzles on cavitation jets are the key objective. These parameters mainly include inlet pressure, outlet pressure, temperature of water, nozzle convergence angle, the length of the nozzle cylindrical section, nozzle diameter and nozzle export chamfer angle. The results provide methods to limit the emergence and development of the nozzle jet internal cavitations.

scholarly journals Investigation on the Characteristics of a Combination Microflow Control Valve

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yuqi Wang ◽  
Xinhui Liu ◽  
Jinshi Chen ◽  
Yafang Han ◽  
Siyuan Liu ◽  
...  
Keyword(s):  
Flow Rate ◽  
Structural Parameters ◽  
Flow Characteristics ◽  
Control Valve ◽  
Hydraulic Systems ◽  
Flow Area ◽  
Port Area ◽  
Rate Fluctuation ◽  
Calculation Results ◽  
Flow Regulator

Flow control valves have broad application prospects in aviation hydraulic systems. This paper proposes a combination microflow control valve (CMCV) instead of the traditional valve to optimize the performance. Influences of structural parameters of CMCV on its characteristics are numerically investigated to determine the static and dynamic characteristics of CMCV. The calculation results indicate that there is a negative feedback control between stages of the flow regulator, the orifice pressure drop is compensated, and the flow regulation deviation is reduced. The orifice area and the flow regulator valve port area have significant effects on flow characteristics. The diameter of orifice, the spring stiffness, the number of throttle holes, and the ultimate displacement of sleeve are positively correlated with the flow rate stability value of the valve. The valve port flow area gradient and initial overlap of the flow regulator affect the flow rate fluctuation range and response time of CMCV.

scholarly journals Heat transfer and flow characteristics of offset fin and flat tube heat exchangers under low pressure environment

2020 ◽  
Vol 24 (3 Part B) ◽  
pp. 2023-2034
Author(s):  
Rui Wan ◽  
Yichun Wang ◽  
Revaz Kavtaradze ◽  
Xinglei He
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Cooling System ◽  
Structural Parameters ◽  
Wind Tunnel Test ◽  
Flow Characteristics ◽  
Engineering Calculation ◽  
Low Pressure ◽  
Flat Tube ◽  
Tube Heat Exchanger

Due to the performance degradation of the vehicle cooling system heat exchanger in the low pressure environment, the problem of overheating of the cooling system occurs when the vehicle is running on the plateau. This seriously affects the use of vehicles on the plateau environment. Therefore, it is necessary to study the influence of the plateau low pressure environment on the heat transfer and flow characteristics of the vehicle cooling system heat exchanger. In this paper, an experimental study of an offset fin and flat tube heat exchanger was conducted on a low pressure wind tunnel test bench, and the heat transfer and flow characteristics of the heat exchanger under different gauge pressure conditions were analyzed. Based on this, numerical simulations were carried out to study the heat transfer and flow characteristics of the heat exchanger with different structural parameters under low pressure environment. The empirical correlation of Colburn factor, j, and friction factor, f, were fitted using multiple linear regression. The research results can provide help for the engineering calculation of the offset fin and flat tube heat exchanger.

scholarly journals Analysis of Three-Dimensional Flow Field Inside the Pilot Stage of the Deflector Jet Servo Valve

2021 ◽  
Author(s):  
Shuanglu Li ◽  
YaoBao Yin ◽  
JiaYang Yuan ◽  
ShengRong Guo
Keyword(s):  
Flow Field ◽  
Field Model ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Static Characteristics ◽  
Servo Valve ◽  
Free Jet ◽  
Dimensional Flow ◽  
Deflector Jet

Abstract Current two-dimensional flow field model has some defects in describing the pilot stage’s flow field and static characteristics of the deflector jet servo valve(DJSV) because the three-dimensional(3D) jet of the flow field is ignored. In order to overcome the shortcomings, a new flow field model is proposed and the energy transfer process of the pilot stage is obtained. In this model, the flow field is divided into five regions: pressure jet region, free jet region, mixed collision region, secondary jet region and pressure recovery region. Especially, three-dimensional turbulent jet is adopted in the free jet region for the first time to describe the structure of the flow field, and the jet entrainment model is proposed in pressure recovery region to describe the coupling relationship between the pressure in the receiving chamber and the jet flow which has never been considered before. The static characteristics of the pilot stage, such as pressure-flow characteristics, pressure characteristics and flow characteristics are obtained, and the relationship between zero-position valve coefficients and the key structural parameters of the pilot stage is analyzed. The results show that main structural parameters that affect the pressure gain include the length of receiving chamber, the width of guide groove outlet and the width of the wedge; The thickness of jet-pan has the most significant influence on flow gain. The flow field structure and the static characteristics are verified respectively by finite element analysis(FEA) and experimental results, and the results show that the pilot stage mathematical model has good reliability which is beneficial to understand the working mechanism of the pilot stage provide theoretical basis for parameter optimization.

A Study on Flow Characteristics of Coherent Jet Oxygen Injector

2011 ◽  
Vol 194-196 ◽  
pp. 347-350
Author(s):  
Zi Qiang Lv ◽  
Qing Yuan Ma ◽  
Xiao Jun Su
Keyword(s):  
Oxygen Supply ◽  
Structural Parameters ◽  
Flow Characteristics ◽  
Steelmaking Process ◽  
Practical Operation ◽  
Velocity Decay ◽  
Coherent Jet ◽  
Supply Equipment ◽  
Jet Characteristics ◽  
The Impact

Oxygen injector is oxygen supply equipment for steelmaking process. Based on the numerical simulation of the flow field of a new coherent jet oxygen injector and traditional supersonic oxygen injector, the authors contrasted the axial and radial velocity decay of them. After a discussion on the influence of structural parameters on the jets, the authors pointed the impact of the jet characteristics of oxygen injector due to structural wear from the angle of practical operation.

Simulation and Experiment of a Designed Anti-Drift Spray Nozzle

2017 ◽  
Vol 8 (2) ◽  
pp. 837-841
Author(s):  
W. Deng ◽  
C. Zhao ◽  
L. Chen ◽  
R. Zhang
Keyword(s):  
Structural Parameters ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Flow Fields ◽  
Structural Parameter ◽  
Structural Factors ◽  
Simulation And Experiment ◽  
Three Dimensional Models ◽  
Set Up ◽  
The Relationship

This paper reports an investigation of the relationship between spray characteristics and a nozzles’ internal structure to reveal the working mechanism of anti-drift spray nozzles. Three important structural factors were taken into account, the diameter of the inner chamber, the angle of V-shaped slot and the relative kerf depth. Three-dimensional models of the fan nozzles were set up using Solidworks software and the corresponding real nozzles were produced using high-precision 3-D printer. The flow fields inside the nozzles were simulated using the software FLUENT. By comparing the flow fields inside and outside the nozzles under the conditions of the same inner structural parameter, the relationships between spraying flow characteristics and different structural parameters was made clear, and provides a reference for optimal design of anti-drift spray nozzles.

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