Study on the ignition delay times of propene/oxygen/nitrogen mixtures by using shock tube

Ignition delay times were measured for propene/oxygen/nitrogen mixtures behind reflected shock waves in a double diaphragm chemical shock tube in the range of 1650-1900 K and at 0.1 MPa. An appropriate definition of ignition delay time was proposed based on an analysis of the flow condition in an ideal shock tube. The experiment results show that the ignition delay times of the mixtures decreased with the increase in initial temperature. The logarithmic value of the ignition delay times was proportional to the reciprocal of temperature and inversely proportional to incident shock intensity. Under high temperature conditions, the ignition delay times increased with the increase in initial pressure and decreased with the increase in the concentration of propene in the mixtures. An Arrhenius-type correlation equation for the ignition delay time of propene/oxygen/nitrogen mixtures was developed, and its calculation results agree well with the data in literature.