Weak and Strong Ignition. II. Sensitivity of the Hydrogen-Oxygen System
Abstract
This paper identifies the physical and chemical mechanisms which cause certain mixtures of hydrogen, oxygen and argon to be very sensitive to sound wave or entropy (temperature) perturbations. Detailed simulations of the effects of sound waves in typical mixtures are used to show explicity the effects of such fluctuations on the chemical induction time. A quantity delta TAU max, is defined which represents the maximum variation produced in the chemical induction time of a system given the amplitude and frequency of a perturbation. It is observed that these perturbations may cause ignition to occur unevenly in such mixtures and this leads to ignition which appears spotty. Using detailed numerical simulations and a generalized induction parameter model derived from it, delta TAU max is evaluated and a criterion is developed for spotty and smooth ignition behind reflected shock waves. These effects are related to weak and strong ignition observed in shock tube experiments. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 07, 1981
- Accession Number
- ADA108843
Entities
People
- Elaine Oran
- Jay Paul Boris
Organizations
- United States Naval Research Laboratory