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ON THE USE OF CFD IN MODELING COMBUSTION DYNAMICS

Peter Flohr
ALSTOM (Switzerland) Ltd, CH-5405 Baden-Dattwil, Switzerland

Christian Oliver Paschereit
Hermann-Fottinger-Institute, Technical University Berlin, Germany

Аннотация

A method is proposed to derive the complete burner transfer function from a steady-state CFD analysis. This analysis essentially consists of two parts, corresponding to the distinction between the premix flame and lossy burner flow. Firstly, the transfer function of the flame is determined through the assumption of a time-lag mechanism. The convective time-lag between fuel injector and location of the premix flame is obtained from a standard numerical simulation with heat release. Secondly, the transfer function of the burner itself is obtained by assuming that the complex flow through the burner can be described in terms of its aerodynamic losses and an inertia term which is related to the fluctuating column of air inside the burner. A simple transformation makes it possible to determine directly the loss coefficient and the burner inertia from a steady computation if one assumes that the aerodynamic losses are linked to the rotational burner flow, whilst the burner inertia is linked to the burner irrotational flow. This transformation is tested against a generic orifice configuration where experimental data of the transfer function exists. The method is then applied to an experimental gas turbine burner where the transfer function model parameters have been measured in detail. It is found that the model is generally in good agreement with experiments. It is also demonstrated that the model can be used to map the burner stability charactistics for various operating conditions, e.g. for variations in power and flame temperature. A stability analysis is performed by incorporating the flame and burner flow transfer functions into a combustor network model.

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