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Comparison of flamelet and PDF models with detailed experimental data for premixed turbulent combustion

The project undertook a comparison of two combustion models ("flamelet" model and "PDF" model) with experimental results for pre-mixed turbulent combustion, to establish which model applies. An intermediate combustion regime, the distributed reaction zones regime, was established, which has practical significance for equipment such as gas turbines and ramjet engines.

Work on turbulent combustion modelling has resulted in several models based on different approaches, such as the "flamelet" model or the "probability density function" (PDF) model. Predictions from both models needed to be compared to experimental data. This project compared these two models with detailed experimental data from a turbulent Bunsen flame, a well-suited and easily observed experimental set-up. In particular, it focused on an intermediate combustion regime, the "distributed reaction zones" (DRZ) regime, which lies between the flamelet regime (important for spark ignition engines) and the well-stirred reactor regime, where the PDF model applies. The project was intended to provide a better understanding of the complex turbulence/chemistry interactions during combustion. In the long-term, much of the empiricism, on which current chemical-source-term closure models for premixed turbulent combustion are based, should be removed.

Reported by

RWTH Institut für Technische Mechanik
Templergraben 55
52056 Aachen
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