Reaction models and reaction state parameterization for turbulent nonpremixed combustion. Niveditha Krishnamoorthy

ISBN: 9780549464105

Published:

NOOKstudy eTextbook

208 pages


Description

Reaction models and reaction state parameterization for turbulent nonpremixed combustion.  by  Niveditha Krishnamoorthy

Reaction models and reaction state parameterization for turbulent nonpremixed combustion. by Niveditha Krishnamoorthy
| NOOKstudy eTextbook | PDF, EPUB, FB2, DjVu, AUDIO, mp3, ZIP | 208 pages | ISBN: 9780549464105 | 10.47 Mb

An accurate description of turbulent combustion is a subject of ongoing research. Modeling efforts to date have achieved considerable success in describing turbulent non-premixed flames that have significant turbulent chemistry interactions. However,MoreAn accurate description of turbulent combustion is a subject of ongoing research. Modeling efforts to date have achieved considerable success in describing turbulent non-premixed flames that have significant turbulent chemistry interactions. However, accounting for detailed chemistry in the simulations of large-scale, complex hydrocarbon pool fires, using the large eddy simulation (LES) method is a computationally intensive process.

The study undertaken in this dissertation aims at identifying reaction models that can be used to account for the microscale (subgrid) chemistry and transport, and reaction coordinates (manifold parameters) that form the bridge between the micro and the macro (resolved) scales with minimal loss of information based on the intended use of the simulations.-Well known canonical systems such as the infinitely fast chemistry limit (equilibrium), the zero-dimensional perfectly stirred reactor, and the one-dimensional laminar opposed flow flame configuration are first studied. The ability of these systems to describe the thermochemical state of two simple jets flames using mixture fraction and heat loss as the manifold parameters is discussed.-A systematic analysis on the experimental data from two piloted jet flames with significant extinction and reignition is then carried out to generalize the method for identifying appropriate manifold parameters and to quantify the error introduced by this parameterization which, in effect, reduces the dimensionality of the reacting system.-A multiscale model based on one-dimensional turbulence (ODT) is developed for both planar and cylindrical coordinates with complete variable density treatment to address reacting and nonreacting flows.

The motivation for the development of the cylindrical formulation of the ODT model was to widen its scope for model validation. The ODT model is then verified and validated using data from direct numerical simulation studies and from experiments in wall-bounded pipe flow and spatially developing free flows such as a nonreacting propane jet and a reacting, piloted CH4/air flame. The representation of advective, diffusive and reactive scales in the ODT model, and its ability to capture the mixing statistics in different flow configurations makes it a promising reaction model.



Enter the sum





Related Archive Books



Related Books


Comments

Comments for "Reaction models and reaction state parameterization for turbulent nonpremixed combustion.":


eastgreatsmokymountainsparkway.freedlbooksread.site

©2009-2015 | DMCA | Contact us