Abstract
The self-ignition behaviour of various fuel-air mixtures under engine relevant conditions has been investigated in a high-pressure shock tube without using a heat bath. Mixtures of n-heptane, benzene, iso-octane, methanol and MTBE with air were investigated. Two pressure levels for the investigation: 13 bar and nearly 40 bar have been chosen. For n-heptane, the temperature variation covers the region between 1350 K and 660 K, depending on the pressure level, while the ignition behaviour of the other fuels has been determined only above 800 K. The ignition of n-heptane begins with a rapid pressure increase, especially at higher temperatures. Iso-octane, methanol, MTBE and especially benzene show a slow initiation of the ignition without distinct pressure peak (mild ignition) at low temperatures, which at higher temperatures changes to a rapid pressure increase after a variable time lag (strong ignition). A comparison of the ignition delay times is also presented.
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