{"id":{"repo_id":"utc","oai_identifier":"oai:scholar.utc.edu:theses-1895"},"canonical_url":"https://search.dev.ndltd.org/etd/utc/oai:scholar.utc.edu:theses-1895","repository":{"repo_id":"utc","name":"University of Tennessee - Chattanooga","base_url":"https://scholar.utc.edu/do/oai/"},"display":{"title":"Numerical investigation of effects of pressure and chemistry on characteristics of turbulent premixed flames","abstract":"Turbulent premixed flames are used in many energy conversion and propulsion devices. The efficiency and performance of these devices are affected by operating conditions, which also affect the highly nonlinear turbulence-chemistry interactions (TCIs). Previous fundamental studies characterize TCIs at atmospheric pressure, but relevant devices usually operate at higher pressures. This study investigates the effects of elevated pressure and finite-rate chemistry on methane/air turbulent premixed flames using direct numerical simulations performed at pressures of 1 atm and 10 atm and utilize an 8-species and 4-steps mechanism and a 13-species and 73-steps mechanism. The effects of pressure and chemistry on TCIs are examined in terms of the statistical and spectral features. At elevated pressure, there is more flame-front wrinkling, affecting flame curvature and heat release rate. The smaller length scales of turbulence become more energetic, and TCIs are more sensitive to finite-rate chemistry, indicating that complex chemical models may be more appropriate.","abstract_html":"Turbulent premixed flames are used in many energy conversion and propulsion devices. The efficiency and performance of these devices are affected by operating conditions, which also affect the highly nonlinear turbulence-chemistry interactions (TCIs). Previous fundamental studies characterize TCIs at atmospheric pressure, but relevant devices usually operate at higher pressures. This study investigates the effects of elevated pressure and finite-rate chemistry on methane/air turbulent premixed flames using direct numerical simulations performed at pressures of 1 atm and 10 atm and utilize an 8-species and 4-steps mechanism and a 13-species and 73-steps mechanism. The effects of pressure and chemistry on TCIs are examined in terms of the statistical and spectral features. At elevated pressure, there is more flame-front wrinkling, affecting flame curvature and heat release rate. The smaller length scales of turbulence become more energetic, and TCIs are more sensitive to finite-rate chemistry, indicating that complex chemical models may be more appropriate.","abstract_has_math":false,"creators":["Bowers, Jamie"],"institution":"University of Tennessee at Chattanooga","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Ranjan, Reetesh","Sreenivas, Kidambi; Margraves, Charles","College of Engineering and Computer Science"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T05:47:06Z","subjects":["Combustion","Flame","Mathematical models"],"languages":["English","eng"],"rights":[],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://scholar.utc.edu/theses/724","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ranjan, Reetesh","Sreenivas, Kidambi; Margraves, Charles","College of Engineering and Computer Science"]},{"key":"dc:creator","label":"Author","values":["Bowers, Jamie"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2021-08-01T07:00:00Z"]},{"key":"dc:publisher","label":"Institution","values":["University of Tennessee at Chattanooga","Chattanooga (Tenn.)"]},{"key":"dc:relation","label":"Dc Relation","values":["Masters Theses and Doctoral Dissertations"]},{"key":"dc:type","label":"Dc Type","values":["Masters theses","Text"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Combustion","Flame","Mathematical models"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholar.utc.edu/theses/724"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Dept. of Mechanical Engineering","M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science."]},{"key":"dc:description.abstract","label":"Abstract","values":["Turbulent premixed flames are used in many energy conversion and propulsion devices. The efficiency and performance of these devices are affected by operating conditions, which also affect the highly nonlinear turbulence-chemistry interactions (TCIs). Previous fundamental studies characterize TCIs at atmospheric pressure, but relevant devices usually operate at higher pressures. This study investigates the effects of elevated pressure and finite-rate chemistry on methane/air turbulent premixed flames using direct numerical simulations performed at pressures of 1 atm and 10 atm and utilize an 8-species and 4-steps mechanism and a 13-species and 73-steps mechanism. The effects of pressure and chemistry on TCIs are examined in terms of the statistical and spectral features. At elevated pressure, there is more flame-front wrinkling, affecting flame curvature and heat release rate. The smaller length scales of turbulence become more energetic, and TCIs are more sensitive to finite-rate chemistry, indicating that complex chemical models may be more appropriate."]},{"key":"dc:title","label":"Title","values":["Numerical investigation of effects of pressure and chemistry on characteristics of turbulent premixed flames"]}]}],"canonical_facts":{"dc:contributor":["Ranjan, Reetesh","Sreenivas, Kidambi; Margraves, Charles","College of Engineering and Computer Science"],"dc:creator":["Bowers, Jamie"],"dc:date":["2021-08-01T07:00:00Z"],"dc:description":["Dept. of Mechanical Engineering","M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science."],"dc:description.abstract":["Turbulent premixed flames are used in many energy conversion and propulsion devices. The efficiency and performance of these devices are affected by operating conditions, which also affect the highly nonlinear turbulence-chemistry interactions (TCIs). Previous fundamental studies characterize TCIs at atmospheric pressure, but relevant devices usually operate at higher pressures. This study investigates the effects of elevated pressure and finite-rate chemistry on methane/air turbulent premixed flames using direct numerical simulations performed at pressures of 1 atm and 10 atm and utilize an 8-species and 4-steps mechanism and a 13-species and 73-steps mechanism. The effects of pressure and chemistry on TCIs are examined in terms of the statistical and spectral features. At elevated pressure, there is more flame-front wrinkling, affecting flame curvature and heat release rate. The smaller length scales of turbulence become more energetic, and TCIs are more sensitive to finite-rate chemistry, indicating that complex chemical models may be more appropriate."],"dc:identifier":["https://scholar.utc.edu/theses/724"],"dc:language":["English","eng"],"dc:publisher":["University of Tennessee at Chattanooga","Chattanooga (Tenn.)"],"dc:relation":["Masters Theses and Doctoral Dissertations"],"dc:rights":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["Combustion","Flame","Mathematical models"],"dc:title":["Numerical investigation of effects of pressure and chemistry on characteristics of turbulent premixed flames"],"dc:type":["Masters theses","Text"]},"updated_at":"2026-07-24T05:47:06Z"}