Evolution of hydrocarbons ignition delay time over HTAC (High Temperature Air Combustion) conditions

In this investigation, ignition processes of the methane and the propane using a high-temperature oxidizer (T _oxi > T _ai) with a varying oxygen concentration z _O2 - the HTAC (High Temperature Air Combustion) conditions, applying a constant-volume bomb (CVB) was investigated. The influence of the initial temperature of the oxidizer T _oxi was analyzed and discussed. It is shown that in order to achieve an effective reaction of ignition the oxidizer temperature needn't be maximized. Detailed evolution of ignition delay time with equivalence ratio τ _ig was presented. It can be concluded that increment of oxygen concentration z _O2 in oxidizer results in decrease of τ _ig. Trials with propane are characterizing lower values of ignition delay time τ _ig in comparison with methane.