On the suppression of negative temperature coefficient (NTC) in autoignition of n-heptane droplets

Autoignition of n-heptane droplets under microgravity is investigated numerically. The comprehensive model, considering the transience in both the gas and liquid phases and non-ideal thermophysical properties, includes the 116-step reaction mechanism of Griffiths. Two-stage ignition manifests for ambient temperature less than 900 K at elevated pressures of 0.5 and 1.0 MPa. The predicted first delays and total delays agree well with the...