Numerical Investigations on Stable Detonation Limit in a Two-dimensional Curved Channel
Speaker: Akiko Matsuo, Keio University, Japan
Department: Mechanical & Aerospace Engineering
Location: Engineering Quadrangle J201
Date/Time: Friday, May 3, 2013, 11:00 a.m. - 12:00 p.m.
The numerical results of detonation propagating in two-dimensional curved channel. The propagation behavior and the stable propagation limit are examined based on the numerical findings. The detonation propagates in two-dimensional curved channels, where the ratio of inner and outer radii is 1.5. Two propagation modes, namely unstable and stable modes, are observed depending on inner radius. In unstable mode, diffraction and accumulation effect from inner and outer wall complexly appear in detonation propagation. A curved detonation propagates with repetition of decay, re-ignition and propagation. Its velocity varies from underdriven to overdriven in one cycle. In stable mode, the detonation propagates steadily with keeping a curved shock front structure with multi-cellular pattern and a constant detonation velocity in circumferential direction. To investigate the stable propagation limit, the idea of quasi-steady solution is utilized to explain the numerical results of detonation propagation in the curved channels.
Prof. Matsuos research area includes computational fluid dynamics, supersonic combustion, high speed propulsion, and detonation. She has made a number of important contributions in numerical simulations of detonation. One of her major accomplishments in this area is on detonation instability. Dr. Matsuo got her Ph.D. at Nagoya University in 1994. She took a faculty position in the Department of Mechanical Engineering at Keio University in 1997. She was appointed as a full professor in 2008.