Evaluation of the Uniform Conditional State model for gas turbine combustor design
department or school: Applied Science, Faculty of
department or school: Mechanical Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: De Graaf, Stefanie
issued: 2021-04-21T22:24:05Z
issued: 2021
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: A universally applicable user-friendly tool has been developed for numerical simulations of turbulent combustion in gas turbines and is being evaluated in this work. Ultimately the goal is to reliably predict emissions of interest at low computational cost while maintaining a large degree of flexibility with regards to the fuel type and the complexity of the chemical kinetic mechanism as well as the type of combustion that may be present. Premixed, non-premixed as well as partially-premixed combustion could potentially be present in a technical application. Maintaining this versatility gives freedom of design to the user. In this work the criteria necessary for a combustion model suitable for such a tool will be defined and measures of success identified. The Uniform Conditional State (UCS) model allows for the chemistry to be computed a priori and disconnected from physical space using so-called conditioning variables; variables describing specific characteristics, which are deterministic for the combustion process. With that the computational cost is very low and a large degree of flexibility can be achieved compared to other modelling approaches. In theory, the recently developed model of UCS promises to satisfy the required criteria and thus an extensive study was conducted putting this model into practice for the first time. Initially a number of parameters within this modelling approach were defined based on weak assumptions and needed to be evaluated and verified as part of this work as well. With that a valuable report was completed to outline the ability of UCS to serve as a reliable predictive model of turbulence-chemistry interaction in its current state. For instance, while the computational cost indeed proved to be only 20% of that of a comparable simulation in one of the test cases, the accuracy of predictions of emissions such as NOx remains below the aspired target in another test case. The evaluation of this new approach was carried out based on a n…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/77890
note: Evaluation of the Uniform Conditional State model forgas turbine combustor designbyStefanie De GraafB.Sc Aerospace Engineering, University of Stuttgart, 2013M.Sc Aerospace Engineering, University of Stuttgart, 2015A DISSERTATION SUBMITTED IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OFDoctor of PhilosophyinTHE FACULTY OF GRADUATE AND POSTDOCTORALSTUDIES(Mechanical Engineering)The University of British Columbia(Vancouver)April 2021c© Stefanie De Graaf, 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 the Uniform Conditional State model forgas turbine combustor designsubmitted by Stefanie De Graaf in partial fulfillment of the requirements for thedegree of Doctor of Philosophy in Mechanical Engineering.Examining Committee:W. Kendal Bushe, Department of Mechanical EngineeringSupervisorCarl Ollivier-Gooch, Department of Mechanical EngineeringSupervisory Committee MemberPatrick Kirchen, Department of Mechanical EngineeringSupervisory Committee MemberGwynn Elfring, Department of Mechanical EngineeringUniversity ExaminerAnthony Wachs, Department of Chemical and Biological EngineeringUniversity ExaminerMatthew Cleary, Faculty of Engineering, University of SydneyExternal ExamineriiAbstractA universally applicable user-friendly tool has been developed for numerical simu-lations of turbulent combustion in gas turbines and is being evaluated in this work.Ultimately the goal is to reliably predict emissions of interest at low computationalcost while maintaining a large degree of flexibility with regards to the fuel type andthe complexity of the chemical kinetic mechanism as well as the type of combus-tion that may be present. Premixed, non-premixed as well as partially-premixedcombustion could potentially be present in a technical application. Maintainingthis versatility gives freedom of design to the user.In this work the criteria necessary …
has type: Thesis/Dissertation
date issued: 2021-05
is shown at: 10.14288/1.0396865
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
type: Text
identifier URI: http://hdl.handle.net/2429/77890