Evaluation of low-order manifold representation of chemistry in turbulent reactive flows
department or school: Applied Science, Faculty of
department or school: Mechanical Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Mousemi, Arash
issued: 2021-08-19T15:37:42Z
issued: 2021
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The experimental data from the Cambridge-Sandia burner working in nine different configurations are post-processed to explore the effects of coordinate, swirl flow ratio, and stratification factor on the conditionally-averaged reactive scalars. First, the mixture fraction and progress variable are employed to construct a two-dimensional conditional manifold by using all of the data – regardless of the coordinate in the physical domain, swirl ratio, and stratification factor. Moreover, one-point, one-time measurements are utilized to compute the exact joint Probability Density Function (PDF) of the conditioning variables at each point. Having the conditional averages of temperature and mass fractions of reactive scalars in addition to the joint PDF of the conditioning variables, the manifold is applied to calculate the unconditional averages for each of the scalars. The mean values are also obtained by ensemble averaging all the data available for each of the measuring points, and the discrepancies between the values calculated from the two approaches are reported in order to assess the validity of the assumptions underlying the low-dimensional chemistry representations. The results suggest that the two chosen conditioning variables are not sufficient to make the manifold independent of the real domain, so, the normalized total enthalpy is introduced as the third conditioning variable and the process repeated. Results obtained from the three-condition manifold demonstrate that the discrepancies for prediction of the reactive scalars decrease when using the third condition. Moreover, the experimental data are employed to obtain the marginal PDFs for the conditioning variables at various points in the reacting domain. The measurements are then combined from all positions in space to form conditional PDFs of the normalized total enthalpy for various values of the other two variables. The correlation coefficients between the conditioning variables are also investigated. …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/79326
note: Evaluation of Low-Order Manifold Representation ofChemistry in Turbulent Reactive FlowsbyArash MousemiB.Sc., Sharif University of Technology, 2019A THESIS SUBMITTED IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OFMASTER OF APPLIED SCIENCEinTHE FACULTY OF GRADUATE AND POSTDOCTORALSTUDIES(Mechanical Engineering)The University of British Columbia(Vancouver)August 2021© Arash Mousemi, 2021The following individuals certify that they have read, and recommend to the Fac-ulty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled:Evaluation of Low-Order Manifold Representation of Chemistry inTurbulent Reactive Flowssubmitted by Arash Mousemi in partial fulfillment of the requirements for thedegree of MASTER OF APPLIED SCIENCE in Mechanical Engineering.Examining Committee:Dr. W. Kendal Bushe, Mechanical EngineeringSupervisorDr. Patrick Kirchen, Mechanical EngineeringSupervisory Committee MemberDr. Gwynn Elfring, Mechanical EngineeringSupervisory Committee MemberiiAbstractThe experimental data from the Cambridge-Sandia burner working in nine differ-ent configurations are post-processed to explore the effects of coordinate, swirlflow ratio, and stratification factor on the conditionally-averaged reactive scalars.First, the mixture fraction and progress variable are employed to construct a two-dimensional conditional manifold by using all of the data – regardless of the co-ordinate in the physical domain, swirl ratio, and stratification factor. Moreover,one-point, one-time measurements are utilized to compute the exact joint Proba-bility Density Function (PDF) of the conditioning variables at each point.Having the conditional averages of temperature and mass fractions of reactivescalars in addition to the joint PDF of the conditioning variables, the manifold isapplied to calculate the unconditional averages for each of the scalars. The meanvalues are also obtained by ensemble averaging all the data available for each ofthe measuring points, and the …
has type: Thesis/Dissertation
date issued: 2021-11
is shown at: 10.14288/1.0401453
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Bushe, W. K.
type: Text
identifier URI: http://hdl.handle.net/2429/79326