CONTROLLING THE LEVEL OF THE SONIC BOOM GENERATED BY A FLYING VEHICLE BY MEANS OF CRYOGENIC FORCING. 2. DISTRIBUTED INJECTION OF A SUPERCOOLED GAS FROM THE VEHICLE SURFACE

摘要

The possibility of improving the effieiency of cryogenie forcing on the parameters of the hanging shock dettrmining the length of the region of minimization of the sonic boom (middle zone) generated by a modified power-law body is studied. The effect of distributed injection of the coolant from the body surface on the formation of a perturbed flow near the body and, at large distances from the body is considered. The scheme of distributed injection and the regime, of coolant exhaustion are demonstrated to exert, a significant effect, on the length of the middle zone of the sonic boom. A scheme of cryogenic forcing is determined, which ensures reduction of bow shock wave intensity by more than 40% at, distances corresponding to 7000 body diameters. The mechanism of cryogenic forcing on the flow structure near the body is discussed.