{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22412"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22412","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Laser diagnostic investigation of the structure of steady and driven hydrogen jet diffusion flames","abstract":"The structure of hydrogen jet diffusion flames has been investigated using coherent anti-Stokes Raman scattering (CARS) and laser-induced fluorescence (LIF) to obtain temperature and nitric oxide (NO) concentrations in steady laminar flames and during the interaction of induced fuel-side vortices with the diffusion flame sheet. The accuracy of the CARS system was evaluated by comparing experimental temperature measurements from H$\\sb2$/air flames produced with a Hencken burner with adiabatic flame temperatures found using the NASA Lewis equilibrium code. The experimental temperature and mole fraction profiles are compared with the results of direct numerical simulations (DNS) of the flames. From a comparison of measured and calculated temperatures in steady, laminar, H$\\sb2$ jet diffusion flames, thermal diffusion was found to be a significant effect. The experimental and computational results for the steady flames show good agreement when thermal diffusion effects are included in the DNS model.","abstract_html":"The structure of hydrogen jet diffusion flames has been investigated using coherent anti-Stokes Raman scattering (CARS) and laser-induced fluorescence (LIF) to obtain temperature and nitric oxide (NO) concentrations in steady laminar flames and during the interaction of induced fuel-side vortices with the diffusion flame sheet. The accuracy of the CARS system was evaluated by comparing experimental temperature measurements from H$\\sb2$/air flames produced with a Hencken burner with adiabatic flame temperatures found using the NASA Lewis equilibrium code. The experimental temperature and mole fraction profiles are compared with the results of direct numerical simulations (DNS) of the flames. From a comparison of measured and calculated temperatures in steady, laminar, H$\\sb2$ jet diffusion flames, thermal diffusion was found to be a significant effect. The experimental and computational results for the steady flames show good agreement when thermal diffusion effects are included in the DNS model.","abstract_has_math":true,"creators":["Hancock, Robert Dean"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Science and Engineering","degree_department":null,"school":null,"contributors":["Lucht, Robert P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:39:02Z","date_published":"2011-05-07T13:39:02Z","updated_at":"2026-07-22T22:25:19Z","subjects":["Engineering, Mechanical"],"languages":["eng"],"rights":["Copyright 1996 Hancock, Robert Dean"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591198867","AAI9712296","(UMI)AAI9712296"],"render_values":[{"text":"9780591198867","href":null,"code":true},{"text":"AAI9712296","href":null,"code":true},{"text":"(UMI)AAI9712296","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22412","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lucht, Robert P."]},{"key":"dc:creator","label":"Author","values":["Hancock, Robert Dean"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:39:02Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Science and Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Mechanical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1996 Hancock, Robert Dean"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591198867","AAI9712296","(UMI)AAI9712296","http://hdl.handle.net/2142/22412"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The structure of hydrogen jet diffusion flames has been investigated using coherent anti-Stokes Raman scattering (CARS) and laser-induced fluorescence (LIF) to obtain temperature and nitric oxide (NO) concentrations in steady laminar flames and during the interaction of induced fuel-side vortices with the diffusion flame sheet. The accuracy of the CARS system was evaluated by comparing experimental temperature measurements from H$\\sb2$/air flames produced with a Hencken burner with adiabatic flame temperatures found using the NASA Lewis equilibrium code. The experimental temperature and mole fraction profiles are compared with the results of direct numerical simulations (DNS) of the flames. From a comparison of measured and calculated temperatures in steady, laminar, H$\\sb2$ jet diffusion flames, thermal diffusion was found to be a significant effect. The experimental and computational results for the steady flames show good agreement when thermal diffusion effects are included in the DNS model.","CARS radial temperature profiles were obtained during vortex-flame interactions in $\\rm H\\sb2/N\\sb2$ and $\\rm H\\sb2/N\\sb2/He$ flames. It has been predicted by Katta and Roquemore (Combust. Flame 100:61-70 (1995)) that the local flame temperature in non-unity Lewis number flames can depart significantly from the local steady-state temperature during vortex-flame interactions. The CARS and DNS model results support this prediction and show similar temperature departures from the steady-state solution. The experimental and numerical NO LIF radial profiles show good quantitative agreement and similar trends. The flames with the highest concentration of nitrogen in the flame zone typically had the highest levels of NO.","A dual-pump CARS apparatus was developed for the simultaneous measurement of gas-phase temperature and the relative concentrations of molecular nitrogen and oxygen. A polarization technique was used to vary the relative intensities of the two CARS signals and expand the dynamic range of the relative concentration measurements. Temperature and oxygen mole fraction measurements obtained in the stabilization region of a $\\rm H\\sb2/N\\sb2$ jet diffusion flame indicate that there exists a region below the nozzle rim where significant amounts of oxygen are found on the fuel side of the flame zone.","Made available in DSpace on 2011-05-07T13:39:02Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712296.pdf: 9278491 bytes, checksum: 0cc3d046390283c0841439002f3b3cb8 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:57:26Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:56-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Laser diagnostic investigation of the structure of steady and driven hydrogen jet diffusion flames"]}]}],"canonical_facts":{"dc:contributor":["Lucht, Robert P."],"dc:creator":["Hancock, Robert Dean"],"dc:date":["2011-05-07T13:39:02Z","10000-01-01","1996"],"dc:description":["The structure of hydrogen jet diffusion flames has been investigated using coherent anti-Stokes Raman scattering (CARS) and laser-induced fluorescence (LIF) to obtain temperature and nitric oxide (NO) concentrations in steady laminar flames and during the interaction of induced fuel-side vortices with the diffusion flame sheet. The accuracy of the CARS system was evaluated by comparing experimental temperature measurements from H$\\sb2$/air flames produced with a Hencken burner with adiabatic flame temperatures found using the NASA Lewis equilibrium code. The experimental temperature and mole fraction profiles are compared with the results of direct numerical simulations (DNS) of the flames. From a comparison of measured and calculated temperatures in steady, laminar, H$\\sb2$ jet diffusion flames, thermal diffusion was found to be a significant effect. The experimental and computational results for the steady flames show good agreement when thermal diffusion effects are included in the DNS model.","CARS radial temperature profiles were obtained during vortex-flame interactions in $\\rm H\\sb2/N\\sb2$ and $\\rm H\\sb2/N\\sb2/He$ flames. It has been predicted by Katta and Roquemore (Combust. Flame 100:61-70 (1995)) that the local flame temperature in non-unity Lewis number flames can depart significantly from the local steady-state temperature during vortex-flame interactions. The CARS and DNS model results support this prediction and show similar temperature departures from the steady-state solution. The experimental and numerical NO LIF radial profiles show good quantitative agreement and similar trends. The flames with the highest concentration of nitrogen in the flame zone typically had the highest levels of NO.","A dual-pump CARS apparatus was developed for the simultaneous measurement of gas-phase temperature and the relative concentrations of molecular nitrogen and oxygen. A polarization technique was used to vary the relative intensities of the two CARS signals and expand the dynamic range of the relative concentration measurements. Temperature and oxygen mole fraction measurements obtained in the stabilization region of a $\\rm H\\sb2/N\\sb2$ jet diffusion flame indicate that there exists a region below the nozzle rim where significant amounts of oxygen are found on the fuel side of the flame zone.","Made available in DSpace on 2011-05-07T13:39:02Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712296.pdf: 9278491 bytes, checksum: 0cc3d046390283c0841439002f3b3cb8 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:57:26Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:56-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["9780591198867","AAI9712296","(UMI)AAI9712296","http://hdl.handle.net/2142/22412"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Hancock, Robert Dean"],"dc:subject":["Engineering, Mechanical"],"dc:title":["Laser diagnostic investigation of the structure of steady and driven hydrogen jet diffusion flames"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Science and Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:19Z"}