An airbag consists of the special elastic shell, which is made of a gas-proof fabric, connected to the combustion chamber which is filled with the granules of a solid monopropellant with comparatively low combustion temperature. In initial state the shell is rolled up into a compact roll. After collision of an automobile with an obstacle the system of solid propellant ignition is initialized. The combustion products fill the shell during 60-100 milliseconds, transforming it into the elastic bag. Pyrotechnic gas-generators are widely used as high-production gas sources for filling the elastic airbag shell. Their solid monopropellant compositions provide ecologically safe gaseous combustion products with low temperature as output. The number of different constructions of such airbags can reach few tens, beginning from miniature ones, which serves for pulling safety belts, to gas-generators for filling airbags of varying capacity which can change, for example, according to weight of passenger or driver. In the development these gas-generators make their way, which is similar to solid-propellant rocket engines. It is the way from purely experimental investigation using model facilities and test benches to development of computer modelling systems which allow decreasing significantly gas-generator projection time and expenses as well as to improve its quality. Nowadays for the numerical modelling zero-dimensional (balance) models are mainly used. Multidimensional effects are taken into account with the help of different subsidary coefficients which are obtained by experiments. The composition of combustion products is defined on the basis of thermodynamic calculations. The calculation of the process of airbag shell filling is very often limited by the modelling of filling of stiff cylindrical vessel of the same volume as the filled shell. The present paper describes the physical model and the numerical modelling of an airbag combustion chamber. It points out which steps have to be taken to the modelling of a full airbag deployment. As the calculation of a combustion process with the current model is already calculation time intensive, high performance computing systems are considered as target platforms. The current results of the joint project of the Institute of Computational Technologies of the Siberian Branch of the Russian Academy of Sciences (ICT SB RAS, Novosibirsk, Russia) and the High Performance Computing Center Stuttgart (HLRS, Stuttgart, Germany) are presented. The project is realized within the framework of the activities of the German-Russian Center for Computational Technologies and High Performance Computing. A three-dimensional non-stationary flow in the airbag combustion chamber is numerically simulated. The technology of parallelization of the upwind LU difference scheme is considered. The future perspectives and challenges of the project are outlined.


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    Title :

    Parallel numerical modelling of gas-dynamic processes in airbag combustion chamber


    Additional title:

    Numerischer Parallel-Modellansatz des gasdynamischen Prozesses in der Airbag-Zündkammer


    Contributors:
    Rychkov, A.D. (author) / Shokina, N. (author) / Bönisch, T. (author) / Resch, M.M. (author) / Küster, U. (author)


    Publication date :

    2006


    Size :

    11 Seiten, 3 Bilder, 4 Quellen





    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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