Three-Dimensional Simulation of Plasma Spray Jet

2003 ◽  
Author(s):  
H. Xiong ◽  
L. L. Zheng ◽  
S. Sampath ◽  
Jim Fincke ◽  
Richard Williamson
Keyword(s):  
Plasma Spray ◽  
Gas Flow ◽  
Probability Distributions ◽  
Three Dimensional ◽  
Plasma Jet ◽  
Carrier Gas ◽  
Spray Process ◽  
Lagrangian Coordinate ◽  
Dimensional Simulation ◽  
Physical Phenomena

A three-dimensional computational model has been developed to describe the compressible, multi-component, turbulent, reacting plasma jet coupled with the orthogonal injection of carrier gas and particles. This model has been applied to plasma spray process that includes physical phenomena such as heating, melting, accelerating, and evaporation of in-flight particles. The entrained particles, NiCrAlY and ZrO2, are discretely treated in a Lagrangian coordinate and stochastically generated by sampling from the probability distributions of the particle size and its velocity at the injection nozzle. In this study, special attention has been directed to the effects of carrier gas injection on the characteristics of plasma jet. The computational results show that the injection of carrier gas from the orthogonal injector above the plasma jet introduce the 3-D phenomena of plasma gas flow. The plasma jet is defected and the thermo-fluid flow near the injector is locally deformed.

CFD Analysis of Engines: An Advanced Approach Based on Codes Dynamically Coupled

2003 ◽  
Author(s):  
Angelo De Vita ◽  
Luca Di Angelo ◽  
Luca Andreassi
Keyword(s):  
Data Exchange ◽  
Internal Combustion Engines ◽  
Gas Flow ◽  
Three Dimensional ◽  
Test Case ◽  
3D Effects ◽  
Flow Effects ◽  
Race Cars ◽  
Direct Feedback ◽  
Physical Phenomena

An advanced approach to evaluate the gas flow in internal combustion engines has been carried out. It is based on an interactive procedure which dynamically couples one-dimensional (1D) and three dimensional (3D) computational fluid dynamics codes. Direct feedback between the codes has been assured allowing 3D fluid flow effects to be fed back into the 1D system. A cycle-by-cycle convergence of results in the data exchange sections has been guaranteed. The capability of describing physical phenomena increases and some numerical problems, as the reflection of pressure waves on the 3D grid boundaries, can be avoided. The procedure has been applied to a simple test case and to a typical engine application where 3D effects are not negligible: flow field definition within an air box for race cars. The procedure has proven effective and could be easily adapted for further different applications.

Modeling time-dependent phenomena in plasma spraying of liquid precursors

2008 ◽  
Vol 80 (9) ◽  
pp. 1981-1991 ◽  
Author(s):  
Armelle Vardelle ◽  
Christophe Chazelas ◽  
Cecile Marchand ◽  
Gilles Mariaux
Keyword(s):  
Plasma Spray ◽  
Specific Treatment ◽  
Plasma Jet ◽  
Deposition Efficiency ◽  
Time Dependent ◽  
Spray Process ◽  
Liquid Precursors ◽  
Liquid Injection ◽  
Liquid Material ◽  
And Control

The recently developed plasma spray processes using liquid precursors make it possible to produce finely structured coatings with a broad range of microstructures and, thus, properties. However, coating reproducibility and control of the deposition efficiency are critical to industrial acceptance of these processes. Both depend on time-dependent interactions between the plasma jet and liquid material. Transient and realistic modeling of the liquid spray process may help to increase the understanding of the process. A comprehensive model should involve the formation of the plasma jet inside the torch and the transient specific treatment (break-up, droplet collision, coalescence, evaporation, chemistry) of the liquid material in the plasma jet. If much progress has been recently made on the modeling of the interaction of arc and transverse flow in the plasma torch, further theoretical and experimental research is needed, especially in respect of liquid injection and fragmentation under plasma spray conditions.

Simulation of Thermal Plasma Spraying of Partially Molten Ceramics: Effect of Carrier Gas on Particle Deposition and Phase Change Phenomena

2000 ◽  
Vol 123 (1) ◽  
pp. 188-196 ◽  
Author(s):  
I. Ahmed ◽  
T. L. Bergman
Keyword(s):  
Plasma Spraying ◽  
Thermal Plasma ◽  
Particle Deposition ◽  
Three Dimensional ◽  
Carrier Gas ◽  
Thermal Plasma Spraying ◽  
History Of ◽  
Powder Particles ◽  
Phase Change Phenomena ◽  
Dimensional Simulation

A three-dimensional simulation of the thermal plasma spraying process is reported. In particular, the effect of the radial injection of a carrier gas is taken into account for a dilute spray. The thermal history of powder particles of different sizes is predicted. It is shown that introduction of a carrier gas can lead to a significant modification of the plasma jet, and can have an effect on the thermal histories of the injected particles. The study is motivated by the processing of non-traditional materials, specifically nanostructured ceramics.

The Flow Characteristic Study of Gas Spray Process in Baosteel Spray Forming Equipment

2005 ◽  
Vol 475-479 ◽  
pp. 2815-2818 ◽  
Author(s):  
Jun Fei Fan ◽  
Yin Zhang ◽  
San Bing Ren ◽  
You Duo He ◽  
Jing Guo Zhang ◽  
...  
Keyword(s):  
Gas Flow ◽  
Flow Characteristic ◽  
Three Dimensional ◽  
Spray Forming ◽  
Simulation Software ◽  
Axial Line ◽  
Flow Zone ◽  
Flow Process ◽  
Spray Process ◽  
Whole Space

The simulation software of compressible gas flow process in spray forming equipment was developed under three-dimensional cylindrical coordinates. When the gas flow strands sprayed from some definite angles into the atomizer chamber, they converged at the definite height in axial line then expanded outside which showed the jet current characteristic. The substrate stagnated the divergence jet strands of gas and then separated the flow strand into two big recycle zones in whole space. One of the recycle flow zone directed downwards, the other recycle flow zone, directed upwards and reached the inlet area, which is the main reason caused the bonding of small liquid drop in the delivery hole.

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