Abstract
To investigate the effect of recirculated combustion products on the combustion process of a typical gas-turbine engine, shock-tube and modeling investigation of ignition delay time was performed. Different mixtures of CH 4 -O 2 -Ar-N 2 -H 2 O were tested. Results showed that replacing N 2 by combustion product components, CO 2 and H 2 O, at concentrations and temperature range, which are typical for the flameless oxidation regime, did not affect the ignition delay time. The temperature range of the shock-heated samples was 1350-1800 K, and the pressure range was 5-10 atm. Modeling calculations were carried out with two mechanisms, and they both showed similar tendency. The correlation between the experimental data and calculations is discussed.
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