4. How do you calculate the cloud's combustion energy?

In order to use the abacus to estimate the overpressure at a given distance, it is necessary to know the cloud's combustion energy (since this is included in the abscissa term of the abacus). This energy, E, is determined as follows

From cloud mass : $E = m_{c o m b} \times Δ H_{c o m b}$

From cloud volume : $E = V_{m e l} \times C_{c o m b} \times ρ \times Δ H_{c o m b}$

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Bibliography

Champassith (A.), Methods for modeling gas explosions [SE5068].
Champassith (A.) – Illustrated choice between CFD and multi-energy for modeling open-air gas explosions [SE5069]
Paris (L.), Assessing the effects of an open-air gas explosion [SE5062].

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