{"id":{"repo_id":"calgary","oai_identifier":"oai:ucalgary.scholaris.ca:1880/119767"},"canonical_url":"https://search.dev.ndltd.org/etd/calgary/oai:ucalgary.scholaris.ca:1880/119767","repository":{"repo_id":"calgary","name":"University of Calgary","base_url":"https://ucalgary.scholaris.ca/server/oai/request"},"display":{"title":"An Experimental Investigation of Ejector Ramjet Performance at Static Conditions","abstract":"The performance of a methane-fueled ejector ramjet (ERJ) equipped with the Atlantis Intake System (AIS) was tested at static conditions. For static tests with no forward velocity, the AIS ERJ successfully entrained and mixed the stagnant surrounding air to create a stoichiometric mixture of 17.2 when the Mach 2 primary jet’s total pressure was 625 ± 25 kPa. Combustion was most stable when the air-fuel mixture was lean. The maximum positive thrust and specific impulse were 22 ± 3 and 189 ± 33 s, respectively, when the primary jet total pressure was 400 kPa. Engine performance was compared to a 1D Ejector Ramjet (1D-ERAM) solver and showed good agreement with a 95% confidence interval during combustion. The solver did not accurately predict the combustion limits of the engine. Additional tests were performed with a nitrogen-diluted fuel jet, which extended the range of conditions for which the ERJ could sustain combustion. The engine demonstrated increased thrust when the primary jet’s total pressure was increased. The inverse Damkohler number was investigated as a tool for predicting engine blowout and provided improved resolution of the engine’s combustion limits, which could be applied to the 1D-ERAM solver","abstract_html":"The performance of a methane-fueled ejector ramjet (ERJ) equipped with the Atlantis Intake System (AIS) was tested at static conditions. For static tests with no forward velocity, the AIS ERJ successfully entrained and mixed the stagnant surrounding air to create a stoichiometric mixture of 17.2 when the Mach 2 primary jet’s total pressure was 625 ± 25 kPa. Combustion was most stable when the air-fuel mixture was lean. The maximum positive thrust and specific impulse were 22 ± 3 and 189 ± 33 s, respectively, when the primary jet total pressure was 400 kPa. Engine performance was compared to a 1D Ejector Ramjet (1D-ERAM) solver and showed good agreement with a 95% confidence interval during combustion. The solver did not accurately predict the combustion limits of the engine. Additional tests were performed with a nitrogen-diluted fuel jet, which extended the range of conditions for which the ERJ could sustain combustion. The engine demonstrated increased thrust when the primary jet’s total pressure was increased. The inverse Damkohler number was investigated as a tool for predicting engine blowout and provided improved resolution of the engine’s combustion limits, which could be applied to the 1D-ERAM solver","abstract_has_math":false,"creators":["Long, Lisa"],"institution":"Graduate Studies","degree_name":"Master of Science (MSc)","degree_level":null,"degree_discipline":"Engineering – Mechanical & Manufacturing","degree_department":null,"school":null,"contributors":[],"advisors":["Johansen, Craig"],"committee_chairs":[],"committee_members":["Gates, Ian","Bauwens, Luc"],"year":2024,"date_issued":"2024-09-16","date_published":"2024-09-16","updated_at":"2026-07-24T01:30:20Z","subjects":["Ejector Ramjet","Aerospace Propulsion","Combustion","Experiment"],"languages":["en"],"rights":["University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://dx.doi.org/10.11575/PRISM/47378"],"render_values":[{"text":"https://dx.doi.org/10.11575/PRISM/47378","href":"https://dx.doi.org/10.11575/PRISM/47378","code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/1880/119767","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Johansen, Craig"]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Gates, Ian","Bauwens, Luc"]},{"key":"dc:creator","label":"Author","values":["Long, Lisa"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2024-11"]},{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-09-18T21:02:04Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-09-18T21:02:04Z"]},{"key":"dc:date.issued","label":"Date","values":["2024-09-16"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Calgary"]},{"key":"dc:type","label":"Dc Type","values":["master thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Engineering – Mechanical & Manufacturing"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MSc)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Calgary"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Ejector Ramjet","Aerospace Propulsion","Combustion","Experiment"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["University of Calgary graduate students retain copyright ownership and moral rights for their thesis. 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Combustion was most stable when the air-fuel mixture was lean. The maximum positive thrust and specific impulse were 22 ± 3 and 189 ± 33 s, respectively, when the primary jet total pressure was 400 kPa. Engine performance was compared to a 1D Ejector Ramjet (1D-ERAM) solver and showed good agreement with a 95% confidence interval during combustion. The solver did not accurately predict the combustion limits of the engine. Additional tests were performed with a nitrogen-diluted fuel jet, which extended the range of conditions for which the ERJ could sustain combustion. The engine demonstrated increased thrust when the primary jet’s total pressure was increased. The inverse Damkohler number was investigated as a tool for predicting engine blowout and provided improved resolution of the engine’s combustion limits, which could be applied to the 1D-ERAM solver"]},{"key":"dc:title","label":"Title","values":["An Experimental Investigation of Ejector Ramjet Performance at Static Conditions"]}]}],"canonical_facts":{"dc:contributor.advisor":["Johansen, Craig"],"dc:contributor.committeemember":["Gates, Ian","Bauwens, Luc"],"dc:creator":["Long, Lisa"],"dc:date":["2024-11"],"dc:date.accessioned":["2024-09-18T21:02:04Z"],"dc:date.available":["2024-09-18T21:02:04Z"],"dc:date.issued":["2024-09-16"],"dc:description.abstract":["The performance of a methane-fueled ejector ramjet (ERJ) equipped with the Atlantis Intake System (AIS) was tested at static conditions. For static tests with no forward velocity, the AIS ERJ successfully entrained and mixed the stagnant surrounding air to create a stoichiometric mixture of 17.2 when the Mach 2 primary jet’s total pressure was 625 ± 25 kPa. Combustion was most stable when the air-fuel mixture was lean. The maximum positive thrust and specific impulse were 22 ± 3 and 189 ± 33 s, respectively, when the primary jet total pressure was 400 kPa. Engine performance was compared to a 1D Ejector Ramjet (1D-ERAM) solver and showed good agreement with a 95% confidence interval during combustion. The solver did not accurately predict the combustion limits of the engine. Additional tests were performed with a nitrogen-diluted fuel jet, which extended the range of conditions for which the ERJ could sustain combustion. The engine demonstrated increased thrust when the primary jet’s total pressure was increased. The inverse Damkohler number was investigated as a tool for predicting engine blowout and provided improved resolution of the engine’s combustion limits, which could be applied to the 1D-ERAM solver"],"dc:identifier.doi":["https://dx.doi.org/10.11575/PRISM/47378"],"dc:identifier.uri":["https://hdl.handle.net/1880/119767"],"dc:language.iso":["en"],"dc:publisher.institution":["University of Calgary"],"dc:rights":["University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. 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