Ignition delay times of DME/air-mixtures diluted with steam

Background

Shockless Explosion Combustion (SEC) is a novel concept to implement constant-volume-combustion in order to achieve an efficiency increase compared to conventional gas turbines. SEC is based on quasi-homogeneous auto-ignition of the fuel/air mixture in the combustion chamber. Therefore, the SEC-process is very sensitive to small perturbations, e.g. in temperature or mixture composition. Dilution of the fuel/air-mixture with steam or exhaust gas are promising strategies to decrease the sensitivity of the process to perturbations^[1]. However, dilution causes an increase in ignition delay time, which again influences the SEC-process. Current reaction mechanisms are not validated for mixture diluted with steam or exhaust gas. Therefore, ignition delay times of DME/air mixtures diluted with steam are measured in the scope of this thesis in a shock tube and compared to predictions of common reaction mechanisms.

Aufgaben

• Literature review.
• Measurement of ignition delay times of DME/air with steam addition in a shock tube.
• Post-processing of measurement data.
• Comparison of measurement data to prediction by reaction mechanisms.

Requirements

• Knowledge in combustion.
• Experimental experience is preferable.
• Knowledge of kinetic software is preferable.

Start: immediately

Contact details: Lisa Zander