Influence of Various Parameters on Initiation Stability and Limits of Detonations
Abstract
During this grant study was carried out on the mechanisms and processes governing transition between flame and detonation in unconfined spherical explosive clouds and how they can be influenced. During the last several years, emphasis has been on investigation of the influence of obstacles on flames and initiation of detonations. Experiments were performed in tubes of various diameters with an orifice placed in the flame path. Various fuels (eg, hydrogen, methane, ethylene, acetylene and carbon disulfide) were used in stoichiometric fuel-oxygen mixtures with reduced nitrogen concentration (compared to air). Smear camera photographs and simultaneously time resolved pressure records were taken. The orifices were found to cause very pronounced local accelerations together with a pressure rise when the flame is transmitted through the orifices. These effects were correlated with the open diameter of the orifices. The maximum pressure was obtained when the orifice diameter is about half the diameter of the initiation section. No detonations were observed in experiments with hydrocarbon-air mixtures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1978
- Accession Number
- ADA068755
Entities
People
- H. Gg. Wagner
- W. Jost
Organizations
- University of Göttingen