Critical tube diameter for detonation transmission and critical initiationenergy of spherical detonation

Two experimental setups are used to study propagation and attenuation of bl ast waves. In the first one; the blast wave is generated by a spherical det onation and in the second one, the blast wave is created by the diffraction of a planar detonation propagating in a tube. The similarity of these phen omena appears clearly by means of dimensionless space-time and pressure-spa ce diagrams of shock wave propagation. Dimensionless variables are expresse d as a function of the supplied energy. Two energy formulations are propose d: a piston model and a bulk energy model. The established diagrams cover a wide range of industrial applications. Under critical conditions, the ener gy released by a planar detonation is correlated to the ignition source ene rgy supply and a relationship which links the critical radius of detonation to the critical tube diameter.