Recently, the terminology of "lift-off flame" is proposed in the case of diesel combustion. However, this terminology is precisely defined in the burning of pre-mixed gas, thus, it is not always suitable to use in the field of diesel combustion. The reason is why the part of a diesel spray near the nozzle exit is too dense to break out the flame because the number density of droplets is too much dense and their velocity is too first to prepare the mixture for the ignition. The author proposes the new terminology of "no flame region" instead of lift-off flame based on his previous investigation on the characteristics of diesel spray and those of its combustion.
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