Spark Ignition Parameters of Cryogenic Hydrogen in Oxygen and Nitrogen Mixtures

Abstract

This paper presents the results of an experimental program to determine the effect of cryogenic temperatures on spark ignition of hydrogen in oxygen and nitrogen mixtures. The parameters investigated are breakdown voltage, quenching distance, flammability limit, and spark ignition energy. Analytical methods for predicting values of most spark ignition parameters for engineering application are cumbersome. Very few data are available in the literature on ignition at cryogenic temperature. This experimental program is intended to supplement the literature data. Data are presented for gaseous mixtures at 180°R and 5, 14.75, and 40 psia. Since ignition and breakdown voltage are influenced by mechanical configuration and materials used in the test apparatus, several tests were conducted at standard conditions, 520°R and 14.75 psia, as a basis for data comparison.