“…corresponds to the limiting position of polar IIb of the reflected shock (its contact with polar III, see Figure 3). The flow behind the reflected shock As a rule [7,[10][11][12][13][15][16][17][18] for an approximate analytical description of the flow in region 3 (Figure 1a,b), a model of a quasi-one-dimensional flow with some initial Mach number M 30 directly downstream from the main shock is used. The value M 30 can be determined by Formula ( 9), then M 30 = M 3T , or a similar relation for J 3 = J 3max , which corresponds to the flow at point N (Figure 1) behind the direct shock (then M 30 = M 3N ), or the half-sum of these values.…”