Behavior of the Maximum Explosion Pressure of Gas-Air Mixtures in Small Free Volumes Inside Spherical Enclosures

National Metrology Institute

Determination of natural constants

Maintenance of the legal units of the SI

Partner in research and industry

Contain gases in designate pathways

Avoiding the spread of an explosion to the outside environment

Explosion pressure highest in spherical enclosures

Maximum Pressure Tests for capsules of small volumes very complex

Goal: Determine behavior of maximum explosion pressure in spherical object of smaller and smaller volume

1: Hollow sphere made of polypropylene2: Ignition electrodes3: Gas supply capillary4: Piezo-electric quartz- pressure sensor5: Polyester resin mantle

repository

Evacuation tank

2 experimental series: 1: Determination of the maximum explosion

pressure for hydrogen-air mixtures (hydrogen concentrations used: 10, 15, 20, 25, 31, 35, 40, 45, 50, 55, and 60%)

2: Determination of the maximum explosion pressure for gas-air mixtures of

propane (4.6%), ethylene (8%), and acetylene (14%)

Measurement interval: 50ms for both series

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