Detonation to Deflagration Transition (DDT) is the process of accelerating a laminar flame to supersonic speeds to cause a detonation. A method used to reach Chapman-Jouguet (CJ) detonation velocities is the induction of turbulence to increase the surface area of the flame front, increasing the consumption rate of unburned gases and the propagation speed of the flame. Perforated plates helped achieve flame acceleration in previous studies to induce turbulence when the flame front interacts with the turbulator; previous work also accomplished detonation speeds with perforated plates. This work aims to visualize the flame front and perforated plate interaction and analyze it. Also, quantify the velocity and pressure of the flame during the flame-turbulator interaction. Experimental data was collected in a semi-confined facility using piezoelectric pressure transducers and high-speed schlieren; for this experiment, a perforated plate was introduced in the middle of the test section to allow for the visualization of the process and data acquisition. The data collected of this work further validates and demonstrates the following: acceleration of flame front using perforated plates; increase in air-fuel ratio and flame acceleration; pressure changes and its effect on flame velocities. The schlieren images allow for the visualization of the interaction between the flame front and the perforated plate previously done in numerical simulations but not experimentally.
Bachelor of Science in Mechanical Engineering (B.S.M.E.)
College of Engineering and Computer Science
Perez, Hector, "Flow Field Dynamics as a Result of Perforated Plates" (2021). Honors Undergraduate Theses. 1070.