{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21262"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21262","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"An experimental investigation of transverse injection from circular and elliptical nozzles into a supersonic crossflow","abstract":"U of I Only","abstract_html":"U of I Only","abstract_has_math":false,"creators":["Gruber, Mark Robert"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Dutton, J. Craig"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:03:24Z","date_published":"2011-05-07T13:03:24Z","updated_at":"2026-07-22T22:25:17Z","subjects":["Engineering, Aerospace","Engineering, Mechanical"],"languages":["eng"],"rights":["Copyright 1996 Gruber, Mark Robert"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9625139","(UMI)AAI9625139"],"render_values":[{"text":"AAI9625139","href":null,"code":true},{"text":"(UMI)AAI9625139","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21262","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dutton, J. 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Four injectant gas/injector geometry combinations were investigated with each case being operated at a jet-to-freestream momentum flux ratio (J) of 2.9. Instantaneous shadowgraph visualizations were produced for each case allowing examination of the flowfield's shock structure and the global characteristics of the jet/freestream interaction. Rayleigh/Mie scattering from silicone dioxide particles seeded into the moist freestream air allowed the collection of ensembles of digital images from several measurement planes in each case; end view planes were examined at four streamwise locations and the spanwise centerplane was investigated extensively. Pitot and concentration probes were used at two end view planes in the two cases using helium as the injectant gas.","Instantaneous images show a highly three-dimensional interaction dominated by large- and small-scale vortices. Analyses of the image ensembles provide mean and standard deviation statistics, lateral spreading and transverse penetration characteristics, large-scale mixing information, two-dimensional spatial correlation fields, pertinent bow and separation shock features, and large-scale convection velocity measurements. Results indicate that the elliptical nozzle produces a jet with greater lateral spread than does the jet from the circular nozzle, while the transverse penetration is significantly suppressed. Injectant molecular weight does not strongly affect the jet's transverse penetration, although it leads to substantial compressibility differences that dramatically influence the characteristics of the large-scale structures formed in the shear layer and the entrainment and mixing occurring between the injectant and crossflow. Mixing layer fluctuations present in air injection cases (low compressibility) intrude deeper into the jet fluid as compared to helium injection cases (high compressibility), where these fluctuations are confined near the jet edge. Probe-based measurement techniques provide quantitative comparisons of the total pressure losses and time-averaged mixing characteristics in these injection flowfields. Results indicate slight performance differences between the two injector geometries that suggest better near-field mixing and slightly lower total pressure losses in the elliptical injection flowfield.","Made available in DSpace on 2011-05-07T13:03:24Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9625139.pdf: 12224151 bytes, checksum: 365faf78d97dda1b7efacaabd48396e4 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:49:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:22:34-05:00 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"]},{"key":"dc:title","label":"Title","values":["An experimental investigation of transverse injection from circular and elliptical nozzles into a supersonic crossflow"]}]}],"canonical_facts":{"dc:contributor":["Dutton, J. Craig"],"dc:creator":["Gruber, Mark Robert"],"dc:date":["2011-05-07T13:03:24Z","10000-01-01","1996"],"dc:description":["U of I Only","Flowfields created by transverse injection of helium and air through circular and elliptical nozzles into a supersonic crossflow have been investigated experimentally using nonintrusive optical diagnostics and intrusive probe-based measurement techniques. Four injectant gas/injector geometry combinations were investigated with each case being operated at a jet-to-freestream momentum flux ratio (J) of 2.9. Instantaneous shadowgraph visualizations were produced for each case allowing examination of the flowfield's shock structure and the global characteristics of the jet/freestream interaction. Rayleigh/Mie scattering from silicone dioxide particles seeded into the moist freestream air allowed the collection of ensembles of digital images from several measurement planes in each case; end view planes were examined at four streamwise locations and the spanwise centerplane was investigated extensively. Pitot and concentration probes were used at two end view planes in the two cases using helium as the injectant gas.","Instantaneous images show a highly three-dimensional interaction dominated by large- and small-scale vortices. Analyses of the image ensembles provide mean and standard deviation statistics, lateral spreading and transverse penetration characteristics, large-scale mixing information, two-dimensional spatial correlation fields, pertinent bow and separation shock features, and large-scale convection velocity measurements. Results indicate that the elliptical nozzle produces a jet with greater lateral spread than does the jet from the circular nozzle, while the transverse penetration is significantly suppressed. Injectant molecular weight does not strongly affect the jet's transverse penetration, although it leads to substantial compressibility differences that dramatically influence the characteristics of the large-scale structures formed in the shear layer and the entrainment and mixing occurring between the injectant and crossflow. Mixing layer fluctuations present in air injection cases (low compressibility) intrude deeper into the jet fluid as compared to helium injection cases (high compressibility), where these fluctuations are confined near the jet edge. Probe-based measurement techniques provide quantitative comparisons of the total pressure losses and time-averaged mixing characteristics in these injection flowfields. Results indicate slight performance differences between the two injector geometries that suggest better near-field mixing and slightly lower total pressure losses in the elliptical injection flowfield.","Made available in DSpace on 2011-05-07T13:03:24Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9625139.pdf: 12224151 bytes, checksum: 365faf78d97dda1b7efacaabd48396e4 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:49:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:22:34-05:00 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"],"dc:identifier":["AAI9625139","(UMI)AAI9625139","http://hdl.handle.net/2142/21262"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Gruber, Mark Robert"],"dc:subject":["Engineering, Aerospace","Engineering, Mechanical"],"dc:title":["An experimental investigation of transverse injection from circular and elliptical nozzles into a supersonic crossflow"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:17Z"}