Investigation of atomization performance on a centrifugal fuel slinger with phase Doppler anemometer

2021 ◽  
Author(s):  
Zhiliang Xue ◽  
Feng Li ◽  
Youqi Zhu ◽  
Zhi Jiang ◽  
Yonggang Zhou ◽  
...  
Keyword(s):  
Phase Doppler Anemometer ◽  
Atomization Performance

Characterization of Spray Flows Under High Fuel Temperature Using Phase Doppler Anemometer

1997 ◽  
pp. 495-508 ◽  
Author(s):  
Tomio Obokata ◽  
Tsuneaki Ishima ◽  
Tetsuji Koyama ◽  
Kouichi Uehara ◽  
Kazumitsu Kobayashi ◽  
...  
Keyword(s):  
Fuel Temperature ◽  
Phase Doppler Anemometer ◽  
Spray Flows

Estimation of Average Void Fraction for Gas-Liquid, Two-Phase Flow in an Industrial Nozzle Assembly Using a Quick-Closing-Valve

2008 ◽  
Author(s):  
Mohammad A. Rahman ◽  
Johana Gomez ◽  
Ted Heidrick ◽  
Brian A. Fleck ◽  
Jennifer McMillan
Keyword(s):  
Void Fraction ◽  
High Speed ◽  
Two Phase Flow ◽  
Video Camera ◽  
Synchronization Error ◽  
Phase Flow ◽  
Closing Time ◽  
Two Phase ◽  
Void Fractions ◽  
Atomization Performance

Experimentally accurate void fraction measurements are a challenge in an air/water, two-phase flows through an industrial nozzle assembly, as a highly non-uniform void fraction exists in the feeding conduit prior to the nozzle. In this study, average void fractions were measured by isolating a section in the feeding conduit of a horizontal nozzle assembly, termed as the quick-closing-valve (QCV) technique. A high-speed video camera was utilized to capture the asynchronization closing time, tac. The average closing time and asynchronization for the pneumatically controlled valves were 200 ms and 2 ms, respectively. Based on the equation of 100umtac (1−α)/αlc, the synchronization error between the two valves was 1.12%, 1.26%, and 1.79% for the 1%, 2% and 4% ALR cases, respectively; here um is the mixture velocity, α is the void faction, and lc is the closing length. Higher synchronization error at 4% ALR occurs due to enhanced momentum in the flow regime. Experimental results indicate that the average α over the 33.4 cm feeding conduit (6.25 mm ID) was 76% (αtheoretical = 75%) for the 2% ALR, and 85% (αtheoretical = 83%) for the 3.3% ALR. In the two-phase, two-component flow the α affects the drop size and stability of the spray produced from an industrial nozzle assembly. Learning from this study will yield insights and conceptual understanding of two-phase flow phenomena in conduit, which would affect stability, pulsation tendency, and possibly atomization performance of the nozzle downstream. Two-phase flow nozzles have wide applications in the industries, e.g. petrochemical, pharmaceutical, and others.

scholarly journals Atomization Performance Study of a Fuel Injector in IGC by Experimental and Numerical Investigation

2015 ◽  
Vol 99 ◽  
pp. 939-947
Author(s):  
Can Ruan ◽  
Xiaoyuan Fang ◽  
Guanxing Huang ◽  
Hongzhou Ho ◽  
Fei Xing
Keyword(s):  
Numerical Investigation ◽  
Fuel Injector ◽  
Performance Study ◽  
Atomization Performance

Characterization of Superheated Liquid Jet Atomisation With Phase Doppler Anemometer (PDA) and High-Speed Imaging

2006 ◽  
Author(s):  
Dilek Yildiz ◽  
Patrick Rambaud ◽  
Jeroen van Beeck ◽  
Jean-Marie Buchlin
Keyword(s):  
Droplet Size ◽  
High Speed ◽  
Initial Conditions ◽  
Particle Diameter ◽  
Superheated Liquid ◽  
High Speed Imaging ◽  
Two Phase ◽  
Phase Doppler Anemometer ◽  
Geometrical Effects ◽  
Initial Storage

A flashing phenomenon is often met in liquid propulsion of safety fields in industrial environments. This violent evaporation occurs when a liquid finds itself suddenly in a thermodynamic non-equilibrium and becomes superheated. To investigate theoretically the source processes and validate models for design and safety assessments, knowledge of accurate and reliable data such as distribution of droplet size, velocity and temperature in the closest field of flashing occurrence is mandatory. In this present work, an experimental study is undertaken in order to characterize the two-phase jet after a sudden accidental release and aims to quantify the effects of initial conditions such as initial storage pressure, temperature, geometrical effects of the release points etc on the spray characteristics. To fulfil this goal, a laser-based optical technique like Phase Doppler Anemometry (PDA) is used to obtain information for particle diameter and velocity evolution in this harsh environment. Cases for different initial pressures, temperatures and orifice diameters are studied and the droplet size and velocity evolution are presented in function of initial parameters.

Influence of Different Outlet Diameters on Atomization Performance of Liquid Beset Gas Nozzles

2012 ◽  
Vol 550-553 ◽  
pp. 3184-3187
Author(s):  
Ding Ping Liu ◽  
Bing Jie Zhang
Keyword(s):  
High Speed ◽  
Power Plants ◽  
Thermal Power ◽  
Experimental Studies ◽  
Spray Nozzle ◽  
Particle Size Analyzer ◽  
Compressed Gas ◽  
New Type ◽  
Atomization Performance ◽  
Gas Nozzle

The wet FGD system with the characteristics of stable and mature, which had been widely used in the large thermal power plants. In this system, spray nozzle plays a key role, and the atomization performance of the spray nozzle affects the desulfurization reaction rate and efficiency directly. A new type spray nozzle, liquid beset gas nozzle was came up with in this article. It makes use of compressed gas in the internal pipeline to crush the liquid flowed out of the external pipeline into small particles. To optimize the nozzle's structure and develop its atomization performance, then considered outlet diameters of nozzle as one of the main influencing factors, sets three outlet diameters of nozzles: 4mm, 5mm and 6mm. This experiment with water for medium uses a laser particle size analyzer and a high speed camera for analysis to take atomization performance's tests of liquid beset gas nozzles under different outlet diameters and working conditions. The results of experimental studies were concluded. Firstly, when the outlet diameter is 5mm, the total spraying performance was the best. Because this outlet diameter can make the nozzle be in a balance between effective crush, fully mixing and jams preventing. Secondly, the new type nozzle had certain adaptability, when working pressures changed, and can be widely used in the wet FGD system.

scholarly journals Application of Advanced Diagnostics to Airblast Injector Flows

1989 ◽  
Vol 111 (1) ◽  
pp. 53-62 ◽  
Author(s):  
J. B. McVey ◽  
J. B. Kennedy ◽  
S. Russell
Keyword(s):  
Flux Distribution ◽  
Liquid Droplet ◽  
Laser Doppler Velocimeter ◽  
Fuel Injector ◽  
Two Phase ◽  
Turbine Engine ◽  
Design Procedures ◽  
Phase Doppler Anemometer ◽  
Injector Flows ◽  
Component Phase

Experimental data on the characteristics of the spray produced by a gas turbine engine airblast fuel injector are reported. The data acquired include the mass-flux distribution, measured by use of a high-resolution spray patternator; the gas-phase velocity field, measured by use of a two-component laser-Doppler velocimeter; and the liquid droplet size and velocity distributions, measured by use of a single-component phase-Doppler anemometer. The data are intended for use in assessments of two-phase flow computational methods as applied to combustor design procedures.

Evaluation of the Effect of Droplet Collisions on Spray Mixing

1996 ◽  
Vol 210 (5) ◽  
pp. 465-475 ◽  
Author(s):  
M Gavaises ◽  
A Theodorakakos ◽  
G Bergeles ◽  
G Brenn
Keyword(s):  
Fluid Dynamics ◽  
Three Dimensional ◽  
Great Influence ◽  
Cross Flow ◽  
Hollow Cone ◽  
Droplet Dispersion ◽  
Droplet Collisions ◽  
Liquid Spray ◽  
Computational Fluid Dynamics Cfd ◽  
Phase Doppler Anemometer

A spray model, implemented in a three-dimensional computational fluid dynamics (CFD) code has been used to evaluate the effect of droplet collisions on spray mixing resulting from the overlapping of liquid spray cones produced by two parallel hollow-cone nozzles under the influence of a cross-flow. The computations are compared with experimental results from phase Doppler anemometer (PDA) measurements in mixing steady sprays. The results show that the droplet collisions, which mainly occur in the mixing area of the two different sprays, have great influence on the droplet size and, as a consequence, on the predicted droplet velocities, especially at distances far from the spray nozzles. Information about the collision mechanisms as well as about droplet velocities and droplet dispersion due to collisions is also presented.

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