Parameters of Spatial Fuel-Air Mixture Detonation

Characteristic Sachs dimension Re = [P/Pol was taken as a reference scale to neglect the shape of the explosive volume in determining the relative distance R =R/Re. That approach does not imply analysis of blast wave parameters at distances of 1 P/Py 3. In experiments described in [1], the radius of the cylinder filled with HAM was Py = 1.7 m. In mixtures with less than 28.7% H2 content the pressure and impulse values became lower. 

Gelfand et al., Thermo-Gas Dynamics of Hydrogen Combustion and Explosion, Shock Wave and High Pressure Phenomena, 

Contrary to the aforesaid, in the 52.9% H2 mixture, the blast wave attenuation was not recorded which can be explained by the excessive delay in fuel burning resulting from the expansion of the unbumed hydrogen together with the burn products. The blast characteristics data obtained in [1] for detonation should be supplemented with results from [4, 7, 8]. 

Generalization of data for cylinder blast parameters obtained in the close in zone was not allowed to approach the HAM-air boundary, while analysis of a hemispherical explosion makes it possible to complete the pressure/impulse diagrams at 0.1 i 1 distances (Fig. 9.3a, b). 

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