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Title: Non-premixed Hydrogen Combustion.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the HySAFE Research Priorities Workshop held September 26-27, 2016 in Petten, the Netherlands.
Country of Publication:
United States

Citation Formats

Hecht, Ethan. Non-premixed Hydrogen Combustion.. United States: N. p., 2016. Web.
Hecht, Ethan. Non-premixed Hydrogen Combustion.. United States.
Hecht, Ethan. 2016. "Non-premixed Hydrogen Combustion.". United States. doi:.
title = {Non-premixed Hydrogen Combustion.},
author = {Hecht, Ethan},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9

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  • Flamelet models are now used in many turbulent combustion studies. The reaction zone is described as a collection of laminar flame elements imbedded in the turbulent flow. This approach decouples the detailed modeling of chemistry features of flamelets from the computation of the entire flow field. Most flamelet models consider only premixed or nonpremixed flame elements. But, in some situations, such as ignition of a diffusion flame or combustion in a Diesel engine, premixed and nonpremixed flames may be present in the same flow. The aim of the study is to propose a description, extending the basic ideas of themore » coherent flame model of Marble and Broadwell (1977) including premixed and nonpremixed flamelets. 19 references.« less
  • Two dimensional calculations were made of spark ignited premixed-charge combustion and direct injection stratified-charge combustion in gasoline fueled piston engines. Results are obtained using kinetic-controlled combustion submodel governed by a four-step global chemical reaction or a hybrid laminar kinetics/mixing-controlled combustion submodel that accounts for laminar kinetics and turbulent mixing effects. The numerical solutions are obtained by using KIVA-2 computer code which uses a kinetic-controlled combustion submodel governed by a four-step global chemical reaction (i.e., it assumes that the mixing time is smaller than the chemistry). A hybrid laminar/mixing-controlled combustion submodel was implemented into KIVA-2. In this model, chemical species approachmore » their thermodynamics equilibrium with a rate that is a combination of the turbulent-mixing time and the chemical-kinetics time. The combination is formed in such a way that the longer of the two times has more influence on the conversion rate and the energy release. An additional element of the model is that the laminar-flame kinetics strongly influence the early flame development following ignition.« less
  • An experimental program to research, develop, and demonstrate an axially staged, premixed low emissions combustor is described, with particular emphasis on the many mechanical and thermal problems which were encountered and which seem characteristic of the type. Of these, the risks of autoignition and flashback in the premixing duct were perhaps, the most severe. Their elimination imposed severe constraints on premixing duct geometry and indeed, dictated the layout of the whole combustor. Nevertheless, it proved possible to retain conventional technology to a large extent including the basic combustor structure and mounting arrangements and normal fuel injector accessibility. Large emissions reductionmore » capability was demonstrated to be possible though not within conventional combustor dimensions.« less