Flame development characteristics inside a reverse-flow model combustor from early stages of combustion to steady operation
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Mollahoseini, Zahra
issued: 2021-03-24T23:08:59Z
issued: 2021
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Characteristics of flame development inside a small-scale power generator model combustor featuring a reverse-flow configuration and the influence of such configuration on these characteristics from early stages of combustion to the steady operation of the combustor are investigated experimentally. Simultaneous and high-speed OH* chemiluminescence and pressure measurements are utilized. Two sets of experiments are performed. In the first set, relatively lean premixed methane/air flames with a fuel-air equivalence ratio of 0.7 have been investigated. For these, four experiments pertaining to air flow rates of 100 and 160 standard liters per minute along with two igniter rod positions are performed. For the second set of experiments, the igniter position was fixed, and two fuel-air equivalence ratios of 0.9 and 1 along with two air flow rates of 120 and 130 standard liters per minute are tested. The results pertaining to the first set of experiments suggest that, prior to the appearance of steady thermoacoustic oscillations, three phases, namely, ignition, stabilization, and transition may exist. During the ignition phase, the normalized flame edge velocity can achieve relatively large maximum values owing to the reverse-flow configuration compared to that for closed chambers. The ignition phase is followed by the stabilization phase during which the flame is formed on the flame-holder. During the transition phase, the flame chemiluminescence features one long-period sinusoidal oscillation. Despite significant influence of the reverse-flow configuration on flame dynamics during the ignition and stabilization phases, the spectral characteristics of pressure and flame chemiluminescence oscillations are similar to those of unconfined flames. The results pertaining to the relatively rich flames suggest, depending on the phase of the flame development, the reverse-flow combustor can serve as either a closed or an open system. It was shown that, during the ignition and stab…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/77621
note: Flame development characteristicsinside a reverse-flow model combustorfrom early stages of combustion tosteady operationbyZahra MollahoseiniB.Sc., Sharif University of Technology, 2015M.Sc., University of Tehran, 2018A 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)March 2021© Zahra Mollahoseini, 2021The following individuals certify that they have read, and recommend to the College ofGraduate Studies for acceptance, a thesis/dissertation entitled:Flame development characteristics inside a reverse-flow model combustor from early stagesof combustion to steady operationsubmitted by Zahra Mollahoseini in partial fulfillment of the requirements of the degree ofMaster of Applied ScienceDr. Sina Kheirkhah, UBC, School of EngineeringSupervisorDr. Patrick Kirchen, UBC, Mechanical EngineeringCo-supervisorDr. Sunny Li, UBC, School of EngineeringSupervisory Committee MemberDr. Joshua Brinkerhoff, UBC, School of EngineeringSupervisory Committee MemberDr. Morad Abdelaziz, UBC, School of EngineeringUniversity ExamineriiAbstractCharacteristics of flame development inside a small-scale power generator model combustorfeaturing a reverse-flow configuration and the influence of such configuration on these character-istics from early stages of combustion to the steady operation of the combustor are investigatedexperimentally. Simultaneous and high-speed OH∗ chemiluminescence and pressure measure-ments are utilized. Two sets of experiments are performed. In the first set, relatively leanpremixed methane/air flames with a fuel-air equivalence ratio of 0.7 have been investigated. Forthese, four experiments pertaining to air flow rates of 100 and 160 standard liters per minutealong with two igniter rod positions are performed. For the second set of experiments, theigniter position was fixed, and two fuel-air equivalence ratios of 0.9 and…
has type: Thesis/Dissertation
date issued: 2021-05
is shown at: 10.14288/1.0396347
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/2429/77621