Dynamics of the Internal Flow in Swirl Atomizers by CFD Simulations

2018 ◽  
pp. 100-132
Author(s):  
Roman Ivanovitch Savonov
Keyword(s):  
Numerical Simulation ◽  
Homogeneous Model ◽  
Internal Flow ◽  
Surface Model ◽  
Cfd Simulations ◽  
Two Phase ◽  
Two Phases ◽  
Swirl Atomizer ◽  
Free Surface Model ◽  
Two Fluid

This work presents the simulation of the internal flow in a swirl atomizer. The geometry of the atomizer is calculated by analytical equations used in engineering. The numerical simulation of the two-phase flow is performed by using two equations k-ε turbulence model. The fluids are presented as two-fluid homogeneous model. The interface between two phases is calculated by free surface model. The distribution fields of the axial and tangential velocities, pressures and air core are obtained. The aim of this work is to compare the results obtained by numerical simulation with ones obtained analytically. Also, to study the internal fluids flow inside the atomizer.

scholarly journals Numerical Investigation of the Internal Flow in a Banki Turbine

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Jesús De Andrade ◽  
Christian Curiel ◽  
Frank Kenyery ◽  
Orlando Aguillón ◽  
Auristela Vásquez ◽  
...  
Keyword(s):  
Cross Flow ◽  
Flow Simulation ◽  
Internal Flow ◽  
Surface Model ◽  
Cfd Simulations ◽  
Flow Recirculation ◽  
Pressure Fields ◽  
Ansys Cfx ◽  
Absolute Flow ◽  
Free Surface Model

The paper refers to the numerical analysis of the internal flow in a hydraulic cross-flow turbine type Banki. A 3D-CFD steady state flow simulation has been performed using ANSYS CFX codes. The simulation includes nozzle, runner, shaft, and casing. The turbine has a specific speed of 63 (metric units), an outside runner diameter of 294 mm. Simulations were carried out using a water-air free surface model and k-εturbulence model. The objectives of this study were to analyze the velocity and pressure fields of the cross-flow within the runner and to characterize its performance for different runner speeds. Absolute flow velocity angles are obtained at runner entrance for simulations with and without the runner. Flow recirculation in the runner interblade passages and shocks of the internal cross-flow cause considerable hydraulic losses by which the efficiency of the turbine decreases significantly. The CFD simulations results were compared with experimental data and were consistent with global performance parameters.

An Improved Single-Phase Free-Surface Lattice Boltzmann Model with Surface Tension and Wall Adhesion

2013 ◽  
Vol 300-301 ◽  
pp. 1062-1066
Author(s):  
Yang Yu ◽  
Li Chen ◽  
Jian Hua Lu ◽  
Guo Xiang Hou
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Lattice Boltzmann ◽  
Single Phase ◽  
Lattice Boltzmann Model ◽  
Surface Model ◽  
Two Phase ◽  
Surface Method ◽  
Free Surface Model ◽  
Boltzmann Model

Free-surface model with surface tension and wall adhesion(wetting) is a very efficient technique to simulate two-phase flows with high density and viscosity ratios, such as etching and casting processes. In this paper, a conservative surface tension and wall adhesion model based on lattice Boltzmann single-phase free-surface method is proposed. The effectiveness of the model is demonstrated by simulating the flows induced by wall adhesion and surface tension, and filling processes in a 2D cavity.

scholarly journals New Leakage Current Particulate Matter Sensor for On-Board Diagnostics

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Jiawei Wang ◽  
Dong Tang ◽  
Songhua Wang ◽  
Zehong Zhu ◽  
Nan Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Particulate Matter ◽  
Leakage Current ◽  
Electronic Circuit ◽  
Internal Flow ◽  
Structure Design ◽  
Bench Test ◽  
Mass Detection ◽  
Two Phase ◽  
Simulation And Experiment

Structure and principle of the new leakage current particulate matter (PM) sensor are introduced and further study is performed on the PM sensor with the combination of numerical simulation and bench test. High voltage electrode, conductive shell, and heaters are all built-in. Based on the principle of Venturi tube and maze structure design, this sensor can detect transient PM concentrations. Internal flow field of the sensor and distribution condition of PM inside the sensor are analyzed through gas-solid two-phase flow numerical simulation. The experiment was also carried out on the whole sensor system (including mechanical and electronic circuit part) and the output signals were analyzed. The results of simulation and experiment reveal the possibility of PM concentration (mass) detection by the sensor.

A Description of the Pressure Swirl Atomizer Internal Flow

2002 ◽  
Author(s):  
D. Donjat ◽  
J. L. Estivalezes ◽  
M. Michau
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Swirling Flow ◽  
Internal Flow ◽  
Liquid Interface ◽  
2D Numerical Simulation ◽  
Swirl Atomizer ◽  
Pressure Swirl ◽  
Pressure Swirl Atomizer ◽  
Exit Orifice

The context of the present work is an investigation of the influence of geometry on the structure of the pressure swirl atomizer internal flow. Vizualisations and measurements techniques (LDA and PIV) are used on a large-scale pressure swirl atomizer. The behaviour of inlets jets and the development of the swirling flow are studied. Measurements of the aircore/liquid interface instabilities revealed the fundamental influence of inlet slots and exit orifice. Finally, a comparison between experimental results and a 2D numerical simulation is presented.

scholarly journals Two-Phase Flow Characteristics on The Extensive Expansion Channel

2017 ◽  
Vol 16 (2) ◽  
Author(s):  
Latif Ngudi Wibawanto ◽  
Budi Santoso ◽  
Wibawa Endra Juwana
Keyword(s):  
Flow Pattern ◽  
Homogeneous Model ◽  
Flow Characteristics ◽  
Flow Equation ◽  
Pressure Recovery ◽  
Sudden Expansion ◽  
Air Velocity ◽  
Two Phase ◽  
Model Flow ◽  
Two Phases

This research was conducted to find out the flow characteristic of two phases through channel with sudden expansion in the form of change of flow pattern and pressure recovery. The test was conducted with variation of superficial velocity of water 0.2-1.3 m / s and superficial air velocity of 0.2-1.9 m / s resulting in pattern of three flow patterns ie bubble, plug, and slug. The expansion channel resulted in some changes to the flow pattern that originally plugs in the upstream channel into bubble in the downstream channel and the slug becomes plug. Pressure recovery experimental results were compared with the homogeneous model flow equation and Wadle correlation, the two correlations had predictions with standard deviation values of 0.32 and 0.43.

Numerical Simulation of the Gas-Solid Flow in a Mini-Riser Reactor

2011 ◽  
Vol 396-398 ◽  
pp. 356-360
Author(s):  
Qun Shuai ◽  
Gen Lin Niu ◽  
Hui Zhao ◽  
Qiang Li
Keyword(s):  
Numerical Simulation ◽  
Kinetic Theory ◽  
Solid Phase ◽  
Fluid Model ◽  
Two Phase ◽  
Operational Conditions ◽  
Riser Reactor ◽  
Two Fluid Model ◽  
Two Fluid ◽  
As Solid Phase

The implementation of the kinetic theory for granular flows added strength to the two-phase flow model in the mini-riser. This model uses simulating and calculating commercial software of Fluent to simulate the mini-riser with 0.012m ID and 3m height. Euler-Euler two fluid model was adopted in two dimensional numerical simulation, according to kinetic theory，the solid stress was calculated based on granular temperature and granular viscosity obtained through simulation which could be used to describe the collision between particles. Simulation results, such as solid phase fraction and solid phase velocity, under different operational conditions basically agree well with the experimental measurement.

Numerical Simulation of Aerodynamic Performances of Wet Compression Compressor Cascade

2006 ◽  
Author(s):  
Qun Zheng ◽  
Yan Shao ◽  
Yinyong Zhang
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Droplet Diameter ◽  
Three Dimensional ◽  
Internal Flow ◽  
Compressor Cascade ◽  
Field Simulation ◽  
Aerodynamic Performances ◽  
Wet Compression ◽  
Two Phases

The thermodynamic analyses and actual applications of wet compression have demonstrated its benefits for power augment. An aerodynamic flow field simulation of the wet compression compressor cascade can give more information about the cascade internal flow patterns. In this paper, a stage of wet compression compressor is simulated with computational fluid dynamics software. Three dimensional, two phases flows are numerically investigated under different water injected amount, different water droplet diameter etc. The CFD results present the details of wet compression compressor cascade flows. And the flow fields of wet compression are compared with those of dry compression.

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