A Study of Detonation Structure: The Formation of Unreacted Gas Pockets.
Abstract
Schlieren photographs of detonations in low pressure H2-O2-Ar mixtures and numerical simulations of propagation detonations have revealed the presence of unreacted pockets of gas behind the shock front - Mach stem structure. These pockets are completely surrounded by burned gas, and they in turn burn more slowly, finally giving their energy to the system. Two-dimensional numberical simulations performed to study the development of unburned pockets show that they are peninsulas of cooler material cut off by the collision of two Mach stems or of a Mach stem and the wall. Their presence is observed when there is sufficient decoupling of the reaction zone from the incident shock. These unreacted gas pockets and the associated long induction distance are discussed in terms of possible mechanisms for cell reinitiation, cell generation, and the behavior of detonations near the detonation limits. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 26, 1982
- Accession Number
- ADA117849
Entities
People
- D. H. Edwards
- Elaine Oran
- J. Michael Picone
- Jay Paul Boris
- T. R. Young
Organizations
- United States Naval Research Laboratory