Computational Technologies and Mathematical Models for Research, Engineering and Education

Almaty, Kazakhstan, September, 18-20, 2002

Abstracts

3-D modeling of gas-dynamic processes in combustion chamber of airbag

Shokina N.Yu., Rychkov A.D.

Institute of Computational Technologies SB RAS (Novosibirsk)

At present the airbag becomes a very popular automotive individual safety device. It consists of the combustion chamber, which is filled with the granules of solid monofuel with comparatively low combustion temperature, connected to the special elastic shell, which is made of gas-proof fabric. In initial state the shell is rolled up into the compact roll. After collision of an automobile with an obstacle the system of solid fuel ignition responds. The combustion products fill the shell during 50 – 80 milliseconds, transforming it into the elastic bag.

The present paper is devoted to the mathematical modelling of the processes in the model of airbag combustion chamber with two slots as output nozzles. The problem consists in investigation of the influence of 3-D flow field structure on the ignition and combustion of propellant granules. The numerical algorithm is developed, which takes into account the non-uniform distribution of temperature in the bulk of every granule and allows the calculation of the movement of combustion products in the regime of percolations. As result there is the opportunity to predict the dynamic if the ignition process in the framework of combustion model with constant surface temperature with the adequate accuracy. 3-D algorithm is based on the second-order upwind LU difference scheme with TVD-properties.

Note. Abstracts are published in author's edition

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