{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/132697"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/132697","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Flame front imaging and ignition performance of ultra-compact trapped-vortex combustor","abstract":"In this study, the flame dynamics and ignition performance of a novel ultra-compact trapped-vortex combustor, the ARC-S1, is investigated. Time-averaged OH* chemiluminescence was used to visualize flame anchoring and distribution inside the combustor. High-speed OH* PLIF imaging was conducted at two spanwise locations along the combustor cavity at 1∼3 atm, revealing an axial shift in flame distribution along the cavity vortex as pressures increased. The ignition performance of the ARC-S1 was investigated at atmospheric pressure, with air injection temperatures of 25° and 10°C, using a conventional spark igniter and an experimental plasma igniter. At lean operating conditions, plasma ignition exhibited up to a 45% reduction in Eign, although negligible improvements were observed from nominal to rich operating conditions.","abstract_html":"In this study, the flame dynamics and ignition performance of a novel ultra-compact trapped-vortex combustor, the ARC-S1, is investigated. Time-averaged OH* chemiluminescence was used to visualize flame anchoring and distribution inside the combustor. High-speed OH* PLIF imaging was conducted at two spanwise locations along the combustor cavity at 1∼3 atm, revealing an axial shift in flame distribution along the cavity vortex as pressures increased. The ignition performance of the ARC-S1 was investigated at atmospheric pressure, with air injection temperatures of 25° and 10°C, using a conventional spark igniter and an experimental plasma igniter. At lean operating conditions, plasma ignition exhibited up to a 45% reduction in Eign, although negligible improvements were observed from nominal to rich operating conditions.","abstract_has_math":false,"creators":["Yoon, Joshua"],"institution":"University of Illinois Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Lee, Tonghun"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-12","date_published":"2025-12","updated_at":"2026-07-22T22:25:07Z","subjects":["Flame Dynamics, Compact Combustor, Flame Imaging"],"languages":["en"],"rights":["Copyright 2025 Joshua Yoon"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/132697","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lee, Tonghun"]},{"key":"dc:creator","label":"Author","values":["Yoon, Joshua"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-12","2025-12-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Flame Dynamics, Compact Combustor, Flame Imaging"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2025 Joshua Yoon"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/132697"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In this study, the flame dynamics and ignition performance of a novel ultra-compact trapped-vortex combustor, the ARC-S1, is investigated. Time-averaged OH* chemiluminescence was used to visualize flame anchoring and distribution inside the combustor. High-speed OH* PLIF imaging was conducted at two spanwise locations along the combustor cavity at 1∼3 atm, revealing an axial shift in flame distribution along the cavity vortex as pressures increased. The ignition performance of the ARC-S1 was investigated at atmospheric pressure, with air injection temperatures of 25° and 10°C, using a conventional spark igniter and an experimental plasma igniter. At lean operating conditions, plasma ignition exhibited up to a 45% reduction in Eign, although negligible improvements were observed from nominal to rich operating conditions.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-12-01","The student, Joshua Yoon, accepted the attached license on 2025-12-05 at 21:44.","The student, Joshua Yoon, submitted this Thesis for approval on 2025-12-05 at 21:47.","This Thesis was approved for publication on 2025-12-08 at 08:26.","DSpace SAF Submission Ingestion Package generated from Vireo submission #23092 on 2026-02-19 at 18:46:50"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Flame front imaging and ignition performance of ultra-compact trapped-vortex combustor"]}]}],"canonical_facts":{"dc:contributor":["Lee, Tonghun"],"dc:creator":["Yoon, Joshua"],"dc:date":["2025-12","2025-12-08"],"dc:description":["In this study, the flame dynamics and ignition performance of a novel ultra-compact trapped-vortex combustor, the ARC-S1, is investigated. Time-averaged OH* chemiluminescence was used to visualize flame anchoring and distribution inside the combustor. High-speed OH* PLIF imaging was conducted at two spanwise locations along the combustor cavity at 1∼3 atm, revealing an axial shift in flame distribution along the cavity vortex as pressures increased. The ignition performance of the ARC-S1 was investigated at atmospheric pressure, with air injection temperatures of 25° and 10°C, using a conventional spark igniter and an experimental plasma igniter. At lean operating conditions, plasma ignition exhibited up to a 45% reduction in Eign, although negligible improvements were observed from nominal to rich operating conditions.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-12-01","The student, Joshua Yoon, accepted the attached license on 2025-12-05 at 21:44.","The student, Joshua Yoon, submitted this Thesis for approval on 2025-12-05 at 21:47.","This Thesis was approved for publication on 2025-12-08 at 08:26.","DSpace SAF Submission Ingestion Package generated from Vireo submission #23092 on 2026-02-19 at 18:46:50"],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/132697"],"dc:language":["en"],"dc:rights":["Copyright 2025 Joshua Yoon"],"dc:subject":["Flame Dynamics, Compact Combustor, Flame Imaging"],"dc:title":["Flame front imaging and ignition performance of ultra-compact trapped-vortex combustor"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:07Z"}