Ignition, Combustion, Detonation, and Quenching of Reactive Mixtures
Abstract
The effects of initial gas temperature, pressure, density, and energy transfer to the gas in the detonation wave have been studied to develop an equation which can be used to predict the length of transition from deflagration to detonation (induction distance) in confined and unconfined combustible gas mixtures. Flame speeds of various hydrogen-oxygen-inert gas mixtures have been measured to determine the relationship between flame speed (deflagration) and induction distance. A nozzle burner having a sine curve contour was used for these experiments to obtain well-defined laminar flame cones permitting reliable and reproducible evaluations. The quenching distances of methane-air, methane- oxygen, acetylene-air and hydrogen-air flames were not affected by potassium chloride, sodium-bicarbonate, or potassium phosphate coatings on the quenching surfaces. It was also found that the quenching distances of these flames are independent of the linear speed of the unburned gas as long as the flows are laminar. Variations of the burner width also did not affect the quenching distances. However, rather significant increase of the quenching distances were observed when the narrow sides between the quenching distances were observed when the narrow sides between the quenching surfaces were closed. New iteration formulas have been developed to simplify to simplify and reduce the computational work for calculating detonation parameters and the performance of thermal engines (ramjet, rocket, gas turbine, and internal combustion engine). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1979
- Accession Number
- ADA083737
Entities
People
- Rudolph Edse
Organizations
- Ohio State University