Jet plume temperature effects on afterbody pressure distribution and drag

Experiments have been carried out on an axisymmetric configuration with a circular arc boat tailed afterbody to study the jet plume temperature effects on afterbody pressure distribution and drag. It is found that the jet plume temperature systematically affects afterbody pressure distribution and that the afterbody drag decreases with increasing jet plume temperature. At Mach 0.62 and a jet pressure ratio of 2.9, the afterbody pressure drag coefficient at a jet temperature of 945 K is 30-40 percent less than its value at a jet temperature of 307 K (cold jet)