ZURUECK HOCH VOR INHALT SUCHEN

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Proposing Institution

Institut für Technische Verbrennung, RWTH Aachen
Project Manager

Dr. Antonio Attili
Templergraben 64
52056 Aachen
Abstract
For the development of gas turbine engines, pollutant formation during combustion plays a significant role. Due to increasingly stringent emission limits, further improvements and optimization are required. Numerical simulations can contribute to cost reduction and acceleration of the development process. However, regarding pollutant emissions, a lack in the predictive quality of state-of-the-art combustion models often limits the usefulness of numerical results. In stationary gas turbines, CO emissions become relevant under part load conditions, which are characterized by low equivalence ratios of the air/fuel mixture leading to low exhaust temperatures. Under these conditions, heat losses due to cooling or mixing with cold air can affect the overall combustion process. This leads to quenching of CO oxidation and a deviation of the time scales of CO chemistry. Consequently, the common assumption of fast-chemistry for CO production and consumption becomes invalid. The effect of turbulence/chemistry interaction on these phenomena are not fully understood and this project aims at shedding light at the relevant effects, which need to be captured by reduced order combustion models. Although experimental setups provide relevant and important data, the measurements of CO are limited to few locations, notably in the exhaust region. This data is insufficient to identify and better understand the processes involved in altering CO chemistry. To this end, Direct Numerical Simulations are performed within this project in a simplified configuration, which represent the combustion processes and provide the necessary data by which turbulence/chemistry interactions can be studied in detail. Based on the findings obtained, CO emission models will be developed for turbulent combustion in the context of large-eddy simulations.

Impressum, Conny Wendler