Abstract
A number of experiments have been per ormed with blast waves arising from the ignition of homogeneous and well defined mixtures of methane, oxygen and nitrogen, contained within spherical balloons with controlled initial diimnsions.
The maximum flame speed has been of the order of 100 m/s, resulting in positive peak pressures of 50-iOO*102Pa in 5-10 m distance from the source. The explosion process was found to be reasonable symmetric.
The attenuation of the blast wave due to vegetation and the influence of obstacles as banks, walls and houses on the pressure field have been investigated. The presence of the bank and the house was felt in a zone with a length corresponding to a typical dimension of the obstacles, whereas the overall pressure field is shown to be unaffected by the the type of obstacles and vegetation investigated.
For the wall and house, reflection factors have been established, and some variation over the surface has been measured.
The scatter of the pressure measurements is estimated for stable, neutral and unstable atmospheric conditions, and an attempt to determine the ground reflection factor has been performed.
Finally the accelerations of a house exposed to the blast wave have been examined.
The maximum flame speed has been of the order of 100 m/s, resulting in positive peak pressures of 50-iOO*102Pa in 5-10 m distance from the source. The explosion process was found to be reasonable symmetric.
The attenuation of the blast wave due to vegetation and the influence of obstacles as banks, walls and houses on the pressure field have been investigated. The presence of the bank and the house was felt in a zone with a length corresponding to a typical dimension of the obstacles, whereas the overall pressure field is shown to be unaffected by the the type of obstacles and vegetation investigated.
For the wall and house, reflection factors have been established, and some variation over the surface has been measured.
The scatter of the pressure measurements is estimated for stable, neutral and unstable atmospheric conditions, and an attempt to determine the ground reflection factor has been performed.
Finally the accelerations of a house exposed to the blast wave have been examined.
| Original language | English |
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| Place of Publication | Roskilde |
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| Publisher | Risø National Laboratory |
| Number of pages | 162 |
| ISBN (Print) | 87-550-1121-7 |
| Publication status | Published - 1987 |
| Series | Denmark. Forskningscenter Risoe. Risoe-R |
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| Number | 499 |
| ISSN | 0106-2840 |
Keywords
- Risø-R-499
- Risø-R-499(EN)