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Theoretical and numerical modelling of reactive compressible flows and experimental validation

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Reliable predictions of turbulent gaseous combustion events in large-scale industrial devices or nuclear reactor containments under accident conditions play an increasingly important role in the design process of such facilities. However, existing theoretical and numerical models of turbulent high-speed combustion, in particular for the transition to detonation, are as yet insufficient for design purposes.

In this research project, improved turbulent combustion models will be developed which will particularly account for the effects of compressibility and stochastic instability, based on two fundamentally different approaches. One approach relies on probability density methods and Monte Carlo simulation of the evolution of the probability density functions for a reactive scalar. The other scheme is based on the flamelet theory of turbulent combustion, which assumes chemical reactions to take place in an ensemble of thin quasi-one-dimensional laminar flames.

These existing models, valid for low-speed combustion, will be extended to compressible high-speed combustion regimes. The schemes will be implemented in modern shock capturing compressible flow solvers, which operate efficiently at both low and high flow Mach numbers. The extensive existing databases of two Russian participants will be used, as well as new specifically designed experiments on high-speed combustion, deflagration-to-detonation transition and stochastic auto-ignition in order to support the physical understanding and theoretical modelling. Suitable models for stochastic auto-ignition will also be developed and included in the numerical schemes, in order to capture both the possibilities of a rapid flame acceleration and stochastic/gasdynamic auto-ignition in the unburned gases.

A detailed report on the specific problems arising together with comparably detailed research proposals for further study or preferably new solutions to overcome these difficulties will be provided.

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Rheinisch Westfälische Technische Hochschule Aachen
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Adresse
Templergraben 64
52056 Aachen
Deutschland

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Letzte Aktualisierung: 19 September 1996

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Permalink: https://cordis.europa.eu/project/id/INTAS-94-2580/de

European Union, 2024