Fuel detonation stability and authenticity and a method for measuring them.

new index is proposed in order to estimate the detonation stability of fuels, i.e., a combined detonation index depending on their electrophysical parameters. The real part of the index determines fuel detonation stability, and the imaginary part determines authenticity (corresponding to the standard). Relationships are studied between fuel octane and cetane numbers with the proposed indices. A block diagram of an instrument is provided for measuring these properties. [ABSTRACT FROM AUTHOR]