MINIMUM SPARK IGNITION ENERGIES AND QUENCHING DISTANCES

Minimum Spark Ignition Energies and Quenching Distances 

Most of the data presented in Table HI are taken from Calcote et al. [Ind. Eng. Chem. 44, 2656 (1952)]. Additional data by Blanc et al. [Proceedings of the Combustion Institute 3, 363 (1949)] and Meltzer [NACA RM E53H31 (1953) and NACA RM E52 F27 (1952)] given in the table are designated by the letters B and M, respectively, in parentheses. Since the values for the least minimum ignition energy by Meltzer were extrapolated from low pressures, these values were not given if values by Calcote et al., or Blanc et al. were available. 

The column labeled plain contains data from 1/8-inch rod electrodes and that labeled flange contains data for the negative electrode flanged and the other electrode a 1/8 inch rod. Values in parentheses are taken from a Calcote et al. correlation between the two different types of electrode sets. 

Quenching distances can be obtained from the data presented in Table HI and the correlation given as Fig. 7.5. It is interesting to note that the most stable fuels have the least minimum ignition energy in the region of 0.2mj. 

TABLE HI Minimum Spark Ignition Energy Data for Fuels in Air at 1 atm Pressure 

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Appendix H Minimum Spark Ignition Energies and Quenching distances... 

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