{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/130160"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/130160","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Design and analysis of a compact high-speed air-breathing engine","abstract":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01","abstract_has_math":false,"creators":["Kato, Nozomu"],"institution":"University of Illinois Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Lee, Tonghun","Mayhew, Eric K.","Rovey, Joshua L","Chamorro, Leonardo P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-07-10","date_published":"2025-07-10","updated_at":"2026-07-22T22:25:06Z","subjects":["Scramjet","Ramjet","Air-breathing Engine","Hypersonics"],"languages":["en","eng"],"rights":["Copyright 2025 Nozomu Kato"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/130160","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lee, Tonghun","Mayhew, Eric K.","Rovey, Joshua L","Chamorro, Leonardo P."]},{"key":"dc:creator","label":"Author","values":["Kato, Nozomu"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-07-10","2025-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical 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 Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Scramjet","Ramjet","Air-breathing Engine","Hypersonics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2025 Nozomu Kato"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/130160"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01","The student, Nozomu Kato, accepted the attached license on 2025-07-09 at 14:50.","The student, Nozomu Kato, submitted this Dissertation for approval on 2025-07-09 at 15:18.","This Dissertation was approved for publication on 2025-07-10 at 11:28.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22466 on 2025-10-25 at 15:53:24","This dissertation investigates the underlying physics of challenges associated with compact, high-speed, air-breathing propulsion systems and examines potential solutions. The primary focus is on the unique technical challenges posed by the stringent requirement for a compact design, which will fundamentally alter system performance. Such propulsion systems are critical for the development of platforms such as the Air-Launched Effect (ALE)—a small, unmanned reconnaissance aircraft. To address these challenges, this study combines component design, theoretical analysis, high-speed wind tunnel experiments, and reduced-order modeling. Component-level analyses revealed critical design trade-offs. For the inlet, it was found that while scoop inlets offered high theoretical efficiency, truncated planar two-dimensional inlets provided superior performance for compact designs. For the combustor, experiments demonstrated that newly designed inserts, particularly mesh-based inserts, were capable of achieving stable and more compact combustion compared to a baseline configuration. For the exhaust nozzle, analysis showed that designing for under-expanded conditions enabled a remarkable 44 % length reduction with a corresponding thrust penalty of 20 %. Subsequently, these component-level findings were integrated into a reduced-order model. After its combustor sub-model was tuned and validated against the experimental data, the complete model was used to produce a preliminary integrated engine design, 1319.2 mm in length, capable of generating 137.8 N of thrust for the target flight condition. The primary contribution of this work is a complete design-and-analysis framework that provides critical insights into the performance of compact ramjet/scramjet components and delivers a validated tool for the rapid preliminary design of such propulsion systems."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Design and analysis of a compact high-speed air-breathing engine"]}]}],"canonical_facts":{"dc:contributor":["Lee, Tonghun","Mayhew, Eric K.","Rovey, Joshua L","Chamorro, Leonardo P."],"dc:creator":["Kato, Nozomu"],"dc:date":["2025-07-10","2025-08"],"dc:description":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01","The student, Nozomu Kato, accepted the attached license on 2025-07-09 at 14:50.","The student, Nozomu Kato, submitted this Dissertation for approval on 2025-07-09 at 15:18.","This Dissertation was approved for publication on 2025-07-10 at 11:28.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22466 on 2025-10-25 at 15:53:24","This dissertation investigates the underlying physics of challenges associated with compact, high-speed, air-breathing propulsion systems and examines potential solutions. The primary focus is on the unique technical challenges posed by the stringent requirement for a compact design, which will fundamentally alter system performance. Such propulsion systems are critical for the development of platforms such as the Air-Launched Effect (ALE)—a small, unmanned reconnaissance aircraft. To address these challenges, this study combines component design, theoretical analysis, high-speed wind tunnel experiments, and reduced-order modeling. Component-level analyses revealed critical design trade-offs. For the inlet, it was found that while scoop inlets offered high theoretical efficiency, truncated planar two-dimensional inlets provided superior performance for compact designs. For the combustor, experiments demonstrated that newly designed inserts, particularly mesh-based inserts, were capable of achieving stable and more compact combustion compared to a baseline configuration. For the exhaust nozzle, analysis showed that designing for under-expanded conditions enabled a remarkable 44 % length reduction with a corresponding thrust penalty of 20 %. Subsequently, these component-level findings were integrated into a reduced-order model. After its combustor sub-model was tuned and validated against the experimental data, the complete model was used to produce a preliminary integrated engine design, 1319.2 mm in length, capable of generating 137.8 N of thrust for the target flight condition. The primary contribution of this work is a complete design-and-analysis framework that provides critical insights into the performance of compact ramjet/scramjet components and delivers a validated tool for the rapid preliminary design of such propulsion systems."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/130160"],"dc:language":["en","eng"],"dc:rights":["Copyright 2025 Nozomu Kato"],"dc:subject":["Scramjet","Ramjet","Air-breathing Engine","Hypersonics"],"dc:title":["Design and analysis of a compact high-speed air-breathing engine"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:06Z"}