Jemcov, Aleksandar; Jojic, Branimir Numerical Modeling of Combustion Instability in Rijke Tube Inproceedings CFD2006 CFD Society of Canada, CFD Society of Canada 2006. Abstract | Links | BibTeX | Tags: Combustion, Modelling, Rijke Tube @inproceedings{jemcov2006numerical,
title = {Numerical Modeling of Combustion Instability in Rijke Tube},
author = { Aleksandar Jemcov and Branimir Jojic},
url = {https://www.researchgate.net/profile/Aleksandar_Jemcov/publication/265160842_Numerical_Modeling_of_Combustion_Instability_in_Rijke_Tubes/links/54009ec70cf2bba34c1a4f59.pdf?origin=publication_detail_rebranded&ev=pub_int_prw_xdl&msrp=qXvYaIM1NoaBwk22r3y7phomPdDKE1ybkMDPT6xQ6n7Gc6pSIC4e1VsVMR1ejNnMKtqgjwyg0q1a1AjIKzLbLg%3D%3D_5yTaQFK%2B%2FOwiX4OawttpSFVDsxGtrkqmBqvsoX6MESNK8PqdP70ULOlxLqfRHb4GZ0okByXELkL%2FpSt%2FcikNWw%3D%3D},
year = {2006},
date = {2006-01-01},
booktitle = {CFD2006 CFD Society of Canada},
organization = {CFD Society of Canada},
abstract = {Numerical modeling of combustion instability in Rijke tubes and the development of a new physical model
for the fluctuating chemical reaction source term in the energy equation is the main focus of this paper. Although physical and numerical combustion instability model was developed and tested on Rijke tube, the final goal of this work is to develop the model that can be used for combustion instability simulation in rocket
and air breathing jet engines. The approach taken here consists of the decomposition of the governing equations into a mean flow field equation that contains turbulence and chemical reaction terms, and a perturbation equation that contains nonlinear acoustic and interaction terms responsible for coupling between mean and perturbed flow. The resulting set of equations consists of the Navier-Stokes equations that describe mean flow, and nonlinear acoustic equations that describe perturbed flow. The nonlinear acoustic equations contain spatially varying coefficients whose values are determined by the mean flow. In addition, the nonlinear
acoustic equations contain a forcing term that is a perturbation of the chemical reactions source term from
the energy equation. This term together with spatially varying coefficients represents coupling between the
mean and nonlinear acoustic fields. A new form of the forcing term that models coupling of fluctuations in the pressure field with fluctuations in energy release due to chemical reactions is proposed here. The basis of this model is in the evaporation rate controlled combustion mechanism that was singled out by time scale analysis and validated by numerical experiments of combustion instability in a Rijke tube with n-decane fuel. Results of the numerical simulations show the crucial role of the nonlinear nature of the fluctuating forcing term in the appearance of instabilities.},
keywords = {Combustion, Modelling, Rijke Tube},
pubstate = {published},
tppubtype = {inproceedings}
}
Numerical modeling of combustion instability in Rijke tubes and the development of a new physical model
for the fluctuating chemical reaction source term in the energy equation is the main focus of this paper. Although physical and numerical combustion instability model was developed and tested on Rijke tube, the final goal of this work is to develop the model that can be used for combustion instability simulation in rocket
and air breathing jet engines. The approach taken here consists of the decomposition of the governing equations into a mean flow field equation that contains turbulence and chemical reaction terms, and a perturbation equation that contains nonlinear acoustic and interaction terms responsible for coupling between mean and perturbed flow. The resulting set of equations consists of the Navier-Stokes equations that describe mean flow, and nonlinear acoustic equations that describe perturbed flow. The nonlinear acoustic equations contain spatially varying coefficients whose values are determined by the mean flow. In addition, the nonlinear
acoustic equations contain a forcing term that is a perturbation of the chemical reactions source term from
the energy equation. This term together with spatially varying coefficients represents coupling between the
mean and nonlinear acoustic fields. A new form of the forcing term that models coupling of fluctuations in the pressure field with fluctuations in energy release due to chemical reactions is proposed here. The basis of this model is in the evaporation rate controlled combustion mechanism that was singled out by time scale analysis and validated by numerical experiments of combustion instability in a Rijke tube with n-decane fuel. Results of the numerical simulations show the crucial role of the nonlinear nature of the fluctuating forcing term in the appearance of instabilities. |