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Gas delivery from the seva two chamber airbag gasgenerator

: Niehaus, M.; Pohsner, U.; Greeb, O.; Popp, H.; Menke, K.; Cord, P.; Bouyer, F.; Beteille, F.

Fulltext urn:nbn:de:0011-n-215962 (180 KByte PDF)
MD5 Fingerprint: 9de684bdd18f0a97108d9963d9feb0d6
Created on: 26.9.2013

Fraunhofer-Institut für Chemische Technologie -ICT-, Pfinztal:
Energetic materials - structure and properties : 35th International Annual Conference of ICT, June 29 - July 29, 2004
Pfinztal: ICT, 2004
Fraunhofer-Institut für Chemische Technologie (Internationale Jahrestagung) <35, 2004, Karlsruhe>
Fraunhofer-Institut für Chemische Technologie (International Annual Conference) <35, 2004, Karlsruhe>
Conference Paper, Electronic Publication
Fraunhofer ICT ()

The two chamber system developed by SEVA-Technologies offers several chances and benefits for airbag application. These include clean gas delivery, low sensitivity of the majority of gas generating propellant together with a high gas yield and significantly reduced dimensions of the gas generator.
The major components are a small amount of hot pyrotechnic gas generating charge in the first high pressure combustion chamber connected to the majority of gas generating propellant in the second and low pressure combustion chamber.
In this contribution the thermodynamic profile and several combustion experiments are described with 4 g of an extruded double base propellant in the first and 16 g of ammonium nitrate propellant mixture in the 2nd combustion chamber. The gas yield of this system depends on the overall heat of explosion and therefore on its oxygen balance.
Good conditions with respect to pressure response, gas yield, CO and NOx evolution are obtained with an intimate particulate or pelletized mixture of ammoniumnitrate and a reactive organic component which may act as a fuel and NOx scavenger. Further enhancement of the gas yield and improved CO or NOx conversion can be performed by using small amounts of combustion catalyst. Overall this system generates a higher gas yield and significantly less amounts of particles in the combustion gases than any conventional airbag propellant.