ID#: 178
Abstract Title: Temperature Profiles and their Influence on the ZND Detonation Structure
Session Title: Detonation Structure
Session Date: 7/30/01
Session Start Time: 2:00 PM
Contributing Author: Bauwens, L.
Organization: University of Calgary
Country: Canada
Authors: Luc Bauwens, D. Scott Stewart
Short Abstract: High activation energies usually lead to a detonation structure made up of a shock followed by a subsonic deflagration structure that includes a long induction zone in which temperature changes are of the order of the inverse activation energy, and finally a narrow zone of intense reaction. But it has been known at least since Kassoy and Clarke (JFM, 1985) that, in a subsonic stream of reactive mixture delivered at a fixed origin, this deflagration structure cannot exist, if the Mach number is above the inverse of the square root of the ratio of the specific heats at the origin. On the other hand, it is clear that ZND solutions exist for arbitrary heat release models and arbitrary Mach numbers above the Chapman-Jouguet value, and that similar underdriven steady solutions also exist under the same conditions up the the sonic point (which appears then at incomplete reaction). This apparent contradiction is addressed in detail; it is found that a number of structures are theoretically possible, including, in addition to the zone of intense reaction, which is thin at high activation energies, either an induction zone, or a completion zone, or both.