High-Temperature Ignition of Propane-Oxygen-Argon Mixtures in a Shock Tube at A Pressure of 30 Atm

The ignition delay times are measured in propane-oxygenl mixtures strongly diluted with argon. The experiments are carried out in a shock tube behind the front of the reflected shock wave in the temperature range T = 1250-1770 K at pressure p = 30 atm and the following values of the excess fuel ratios: phi = 0.5, 1.0, and 2.0. It is shown that, in the region of the studied temperatures, the ignition delay time in propane increases with an increase in phi. The obtained data are compared with the results of other measurements, which shows that at low temperatures (T <= 1000 K) the dependence of the ignition delay time on phi has the opposite character.

Automated summary

The ignition delay times of propane in propane-oxygen mixtures diluted with argon are measured behind the front of the reflected shock wave in a shock tube. The results show that the ignition delay time of propane increases with an increase in the excess fuel ratio phi in the studied temperature range. Comparing the obtained data with other measurements reveals that at low temperatures (T <= 1000 K), the dependence of the ignition delay time on phi is opposite.