Effects of Combustion Model and Chemical Kinetics in Numerical Modeling of Hydrogen-Fueled Dual-Stage HVOF System

Sobhan Emami, Hamed Jafari, Yasser Mahmoudi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
166 Downloads (Pure)

Abstract

The present work examines the effect of utilizing different combustion models and chemical kinetics in predicting the properties of gas and particle phases in a hydrogen-fueled, dual-stage high velocity oxy-fuel (HVOF) thermal spray system. For this purpose, effects of two combustion models, EDC (Eddy Dissipation Concept) and EDM (Eddy Dissipation Model), on the temperature and velocity fields in the system are studied. The computations using EDC model are performed for detailed and reduced chemical kinetics and for a range of mixture from lean to rich. It is found that EDC with multi-step reaction mechanism predicts higher temperatures for the flow and particle in the warm spray system. In contrast to EDC, the EDM with one-step global reaction shows extra heat release outside the HVOF barrel for rich mixtures which leads to unphysical higher prediction of particle temperature. The simulations using EDC model with detailed and reduced chemical kinetics show some exothermic reactions in converging-divergent nozzle of the system. The heat release from these reactions has profound impacts on the flow and particle temperatures and affects the gas dynamic behavior of flow considerably. Finally, it is discussed that moving toward rich mixtures is more reliable way to control the particles temperature.
Original languageEnglish
Pages (from-to)333-345
Number of pages13
JournalJournal of Thermal Spray Technology
Volume28
Issue number3
Early online date28 Jan 2019
DOIs
Publication statusPublished - Feb 2019

Keywords

  • chemical kinetics
  • dual-stage high-velocity oxy-fuel (HVOF)
  • eddy dissipation combustion model
  • hydrogen fuel

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Effects of Combustion Model and Chemical Kinetics in Numerical Modeling of Hydrogen-Fueled Dual-Stage HVOF System'. Together they form a unique fingerprint.

Cite this