Accession Number:

ADA083737

Title:

Ignition, Combustion, Detonation, and Quenching of Reactive Mixtures

Descriptive Note:

Interim rept. 1 Apr 78-31 Mar 79

Corporate Author:

OHIO STATE UNIV COLUMBUS DEPT OF AERONAUTICAL AND ASTRONAUTICAL ENGINEERING

Personal Author(s):

Report Date:

1979-11-01

Pagination or Media Count:

51.0

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

Subject Categories:

  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE