Heptane autoignition temperature

Heptane An alkane (saturated aliphatic hydrocarbon) with six carbon atoms, CH3(CH2)4CHj. A volatile, colorless, flammable liquid (autoignition temperature, 222°C). Toxic by inhalation. Obtained by fi actionation of petroleum. Used as a solvent and in organic synthesis. Also called -Heptane. 

Griffiths [85] and Schrieber et al. [86] have shown how the Muller scheme can be modified to incorporate these features by slightly expanding the low temperature part of the mechanisms and adding a further intermediate. While mass and energy balances were intrinsic in the formulation, an empirical approach was adopted both for the form of the additional reaction and for all the rate constants. The latter, for instance, included pressure dependent terms. Good fits were obtained to rapid compression machine and shock-tube autoignition delay-times for heptane, iso-octane, and their mixtures. 

Bradley et al. [80] report elevations of CARS temperatures, with a 90% iso-octane/10% heptane fuel prior to autoignition, of about 100 K above such values, with mean values of about 900 K in non-knocking cycles. The greater the end gas pressure, the greater was the CARS temperature and the knock intensity. The temperature elevations were in line with the computed predictions of the simplified five-reaction parrot scheme, de-... 

In Figure (9), temperature and species profile plots obtained in an investigation of autoignition in the end-gas of an Sl-engine, known as knock, as presented by Soyhan et al. ( yhan et al., 2000), are shown. The calculations are obtained in employing a two-zone model (burnt and unburnt zones), the detailed mechanism for iso-octane and n-heptane mixtures... 

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