A new framework for analysis of fully-premixed and stratified turbulent flames generated by an industrial injector
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Saca, Leslie
issued: 2022-05-20T15:46:37Z
issued: 2022
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: This thesis is concerned with the characterization of an industrial injector, whose modus operandi is turbulent stratified premixed combustion. For this mode of operation, the fuel and air are premixed at molecular level; however, the fuel-air equivalence ratio varies locally at larger scales. A burner was designed and manufactured to house a gaseous fuel/air injector, which was provided by the industrial partner. Both fully and stratified premixed flames of methane and air were tested for a range of mean bulk flow velocities varying between 5 and 50 m/s. The (global) fuel-air equivalence ratio of the (stratified) premixed flames was set to unity. The cross-wire anemometry technique was used to characterize the background turbulent flow; and, the laser Rayleigh scattering technique was employed to investigate both the fuel and air mixedness fields as well as the turbulent flames characteristics. Near the center of the injector lobes, a hydrodynamic instability exists and is accentuated as the mean bulk flow velocity is increased. Analysis of mixedness fields suggests that the amount of the injected fuel is similar for both lobes up to 25 m/s; however, the lobe on the left-hand-side injects more fuel compared to that on the right-hand-side for mean bulk flow velocities larger than or equal to 25 m/s. Traditionally, studying the flame structure for fully and stratified premixed flames requires information regarding the mixture composition across the flame, whose acquisition is challenging. To overcome this challenge, a new parameter, referred to as the reduced temperature was introduced and quantified. It was shown that the probability density function of this parameter is similar for all tested conditions, and was used to develop a method for quantifying the burning area of the tested flames. Assuming that the flame stretch is not significant, it is obtained that stratification can slightly increase the normalized flame burning area. This is in agreement with the res…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/81612
note: A new framework for analysis offully-premixed and stratified turbulentflames generated by an industrialinjectorbyLeslie SacaB.Sc., The University of British Columbia, 2020A thesis submitted in partial fulfillment ofthe requirements for the degree ofMASTER OF APPLIED SCIENCEinThe College of Graduate Studies(Mechanical Engineering)THE UNIVERSITY OF BRITISH COLUMBIA(Okanagan)May 2022© Leslie Saca, 2022The following individuals certify that they have read, and recommend to the College ofGraduate Studies for acceptance, a thesis/dissertation entitled:A new framework for analysis of fully-premixed and stratified turbulent flames generated byan industrial injectorsubmitted by Leslie Saca in partial fulfillment of the requirements of the degree ofMaster of Applied ScienceDr. Sina Kheirkhah, UBC, School of EngineeringSupervisorDr. Sunny Li, UBC, School of EngineeringSupervisory Committee MemberDr. Joshua Brinkerhoff, UBC, School of EngineeringSupervisory Committee MemberDr. Zheng Liu, UBC, School of EngineeringUniversity ExamineriiAbstractThis thesis is concerned with the characterization of an industrial injector, whose modusoperandi is turbulent stratified premixed combustion. For this mode of operation, the fuel andair are premixed at molecular level; however, the fuel-air equivalence ratio varies locally atlarger scales. A burner was designed and manufactured to house a gaseous fuel/air injector,which was provided by the industrial partner. Both fully and stratified premixed flames ofmethane and air were tested for a range of mean bulk flow velocities varying between 5 and50 m/s. The (global) fuel-air equivalence ratio of the (stratified) premixed flames was set tounity. The cross-wire anemometry technique was used to characterize the background turbulentflow; and, the laser Rayleigh scattering technique was employed to investigate both the fueland air mixedness fields as well as the turbulent flames characteristics. Near the center ofthe injector lobes, a hydrodynamic i…
has type: Thesis/Dissertation
date issued: 2022-09
is shown at: 10.14288/1.0413673
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: Kheirkhah, Sina
type: Text
identifier URI: http://hdl.handle.net/2429/81612