Method for quickly calculating overpressure peak value of accidental explosion shock waves in urban streets

The invention discloses a rapid calculation method for an overpressure peak value of accidental explosion shock waves in urban streets, and belongs to the field of explosion fluid mechanics. The method is based on a virtual explosion source thought, reflected waves of explosion shock waves in urban streets on buildings on the two sides of the streets are equivalent to shock waves generated by a virtual explosion source, and the overpressure peak value of the explosion shock waves in the streets is calculated through superposition of a real explosion source flow field and a virtual explosion source flow field. Comprising the following steps: acquiring parameters and establishing an accidental explosion shock wave propagation model in urban streets; setting a virtual explosion source and calculating the equivalent of the virtual explosion source; calculating the geometrical relationship between the wave front of the real explosion source and the wave front of the virtual explosion source; respectively calculati