{"583104":{"#nid":"583104","#data":{"type":"event","title":"Ph.D. Thesis Defense: Zu Puayen Tan","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003EPhD Defense by\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Ch2\u003E\u003Cstrong\u003EZu Puayen Tan\u003C\/strong\u003E\u003C\/h2\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAdvisor:\u0026nbsp; Prof. Ben T. Zinn\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Ch2\u003E\u003Cstrong\u003EExperimental Study of Spray-Formation Processes in Twin-Fluid Jet-In-Crossflow at Jet-Engine Operating Conditions\u003C\/strong\u003E\u003C\/h2\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E2:00 PM, Wednesday, November 9, 2016\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u003Cem\u003EMontgomery Knight Building Room 317\u003C\/em\u003E\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EJet-in-crossflow (JICF) fuel-injection is widely applied in modern jet-engines to provide rapid fuel-atomization and mixing. However, \u0026ldquo;classical\u0026rdquo; JICF places large amounts of fuel into the low-velocity region near the injector wall, which can cause flashback and fuel-coking on the wall. A nascent fuel-injection technique called Twin-Fluid (TF) JICF is being considered as a way to mitigate Classical-JICF\u0026rsquo;s shortcomings. In TF-JICF, air is co-injected around the fuel jet to modify its atomization and penetration characteristics. Designers expect TF-JICF to enhance the fuel\u0026rsquo;s penetration away from the wall (i.e., reduce near-wall fuel concentrations). However, the performance of TF-JICF is currently not well understood, especially at the high pressures found in jet-engines. This dissertation work addresses the knowledge gap by experimentally investigating a TF-JICF where liquid Jet-A fuel was co-injected with pressurized nitrogen into a crossflow of air. The crossflow and injection conditions were varied over wide ranges that cover those conditions reported in the available TF-JICF literature, as well as those expected for jet-engines. The resulting TF-JICF fuel sprays were imaged by shadowgraphy, and their penetrations, dispersions and atomization processes were analyzed.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; For a fixed fuel flow-rate, different levels of air-injection velocities were found to cause different spray characteristics (see figure below). A mild injection of air inhibited the atomization of the initial fuel jet, thus reducing the near-wall fuel concentration and flashback\/wall-coking risks. A very strong injection of air \u0026ldquo;propelled\u0026rdquo; the fuel very far away from the wall while also enhancing atomization. On the other hand, medium levels of air-injection were generally non-beneficial towards fuel-injector design. Four TF-JICF regimes were identified (i.e., Classical-JICF, Air-Assist JICF, Airblast JICF and Airblast Spray-in-Crossflow) based on these characteristics and their formation mechanisms.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EZu Puayen Tan will present his defense for doctoral research in \u0026quot;Experimental Study of Spray-Formation Processes in Twin-Fluid Jet-In-Crossflow at Jet-Engine Operating Conditions\u0026rdquo;\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"\u201cExperimental Study of Spray-Formation Processes in Twin-Fluid Jet-In-Crossflow at Jet-Engine Operating Conditions\u201d"}],"uid":"33975","created_gmt":"2016-10-25 18:19:34","changed_gmt":"2017-04-13 21:14:11","author":"Margaret Ojala","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2016-11-09T14:00:00-05:00","event_time_end":"2016-11-09T16:00:00-05:00","event_time_end_last":"2016-11-09T16:00:00-05:00","gmt_time_start":"2016-11-09 19:00:00","gmt_time_end":"2016-11-09 21:00:00","gmt_time_end_last":"2016-11-09 21:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1239","name":"School of Aerospace Engineering"}],"categories":[],"keywords":[{"id":"2082","name":"aerospace engineering"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78751","name":"Undergraduate students"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}