At present the numerical modeling is an effective tool for understanding in detail the complex physical-chemical processes in different technical devices. One of them is an airbag as part of modern automotive security systems. The present paper is devoted to numerical modeling of the combustion processes in a model airbag elaborated in ICT with two slots as output nozzles. Its topic is the spatial character of reaction product flow in combustion chamber. It is necessary to investigate the influence of structure of flow field on ignition and burning of propellant and booster granules. For modeling of this processes, a numerical algorithm has been developed. It takes into account the non-uniform distribution of temperature in bulk of granules and allows to calculate the movement of burning products in the percolation mode. As a result, it is possible to predict the start of ignition and its displacement in the framework of model burning with fairly realistic constant surface temperature. The basis of the algorithm is the second-order upwind LU difference scheme with TVD-properties.
Numerical modeling of processes in combustion chambers of automotive airbags
Numerische Modellierung von Prozessen in Brennkammern von Kfz-Airbags
2002
6 Seiten, 1 Bild, 1 Quelle
Conference paper
English
Airbag , Automobilindustrie , Brennkammer , dreidimensionale Strömung , Düsenströmung , Fahrzeugbauteil , Festtreibstoff , Gasströmung , mathematisches Modell , numerische Simulation , Oberflächentemperatur , partielle Differenzialgleichung , Phasengleichgewicht , Reaktionswärme , Schutzeinrichtung , Spline-Funktion , Strömungsfeld , Treibmittel , Verbrennungsverhalten , Versuchsmodell , Zündung , Pellets (Erzkonzentrat)
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