IGNITION CHARACTERISTICS OF FUELS AND LUBRICANTS
Summary rept. 1 Jan - 31 Dec 1963
BUREAU OF MINES PITTSBURGH PA
Pagination or Media Count:
Ignition temperatures of n-hexane, n-octane, n-decane, JP-6 jet fuel and aircraft engine oil MIL-L-7808 0-60-18 were determined in air using heated Pyrex cylinders of 0.314-inch to 1.38-inch diameter and Nichrome wires, rods, or tubes of 0.016-inch to 0.75-inch diameter. The ignition temperature varied little with fuel-air ratio but increased as the size of the heat source was decreased. Expressions are given which define the variation of the hot surface ignition temperatures of these combustibles with the radius and the surface area of the heat source. The expressions are applicable to stagnant or low velocity flow conditions 0.2 insec. In addition, the hot gas ignition temperatures of the combustible vapor-air mixtures were determined with 14, 38 and 12-inch diameter jets of hot air. These ignition temperatures also varied little with fuel-air ratio and increased as the diameter of the heat source was decreased.
- Combustion and Ignition