Search button


Date Range:

From: To:

View all

  • Graduate Student Center Graduate Student Center
  • General Public Presentations General Public Presentations
  • Thesis/Dissertation Seminars Thesis/Dissertation Seminars
  • Arts and Humanities Seminars Arts and Humanities Seminars
  • Education Seminars Education Seminars
  • Health Professions Seminars Health Professions Seminars
  • Professional/Business Seminars Professional/Business Seminars
  • Social Sciences Seminars Social Sciences Seminars
  • STEM* Seminars STEM* Seminars
  • Social Events Social Events
  • Student and Professional Development Student and Professional Development
  • Informational Events Informational Events
  • Important Dates Important Dates

*STEM: Science, Technology, Engineering, and Mathematics

International Community

Events Calendar   

Back to Summary

Thesis/Dissertation Seminars

Thesis Defense: Characterization of Fast Flames for Turbulence-Induced Deflagration to Detonation Transition

MAE Lab 102
March 21, 2018 @ 11:00 AM - 01:00 PM

Announcing the Final Examination of Jessica Chambers for the degree of Master of Science

Detonation is a highly efficient mode of pressure gain combustion (PGC) that exploits a rise in stagnation pressure to achieve high thermodynamic efficiencies and thrust capabilities. It has been a challenge to integrate detonation combustion into power generation and combustion applications due to the unstable and unsteady nature of detonations. The critical flow field conditions that drive the onset of a detonation require further investigation. One of the fundamental mechanisms for detonation initiation is turbulence driven deflagration to detonation transition (TDDT). The present research experimentally explores the propagation dynamics of fast, deflagrated hydrogen-air flames interacting with highly turbulent reactants. Fast flames produce extremely high turbulent flame speeds values, increased levels of compressibility and develop a runaway mechanism that leads to TDDT. The flame structural dynamics and reacting flow field are characterized using advanced optical diagnostics including simultaneous high-speed particle image velocimetry, chemiluminescence, and schlieren. These techniques enable the detailed classification of flame propagation modes at various flame acceleration regimes. The study further examines a turbulent, fast flame at the boundary of transitioning to quasi-detonation in order to characterize the evolution of flame-compressibility dynamics approaching critical TDDT conditions. The local measured turbulent flame speed is found to be greater than the Chapman-Jouguet deflagration flame speed, which classifies the flame in the spontaneous transition regime within the deflagration-to-detonation transition runaway process.

Committee in Charge: Kareem Ahmed (Chair), Jayanta Kapat, Alain Kassab


The University of Central Florida is accredited by the Southern Association of Colleges and Schools Commission on Colleges (SACSCOC) to award degrees at the associate, baccalaureate, master’s, specialist, and doctoral levels. Contact the Commission on Colleges at 1866 Southern Lane, Decatur, Georgia 30033-4097 or call (404) 679-4500 for questions about the accreditation of the University of Central Florida.

Please note the commission's expectation that contact occur only if there is evidence to support significant non-compliance with a requirement or standard. For other information about UCF’s SACSCOC accreditation, please contact the university's SACSCOC liaison in UCF's Office of Academic Affairs.

| © 2015 University of Central Florida - College of Graduate Studies