Measurement of solid rocket motor thermally induced radial bond stresses

Abstract

rate, fluorine injection. Long prepressurization times (23 sec) were required to reach 100 psig, and this long, continuous, high-velocity fluorine injection probably created a hole in the Z/H2 that reached from the injector to the ullage along the tank centerline. The vapor in this ullage extension was heated by injection in the same way that US mode injection heats the ullage, which gave a high initial pressurization efficiency that is comparable to that of the US mode. Further, at this high tank pressure, the LH2 outflow rate was quite high, so that the drain from an ullage fraction of 44-78% (shown as the straight solid line) took place in only 6.6 sec. This short time gives little opportunity for heat transfer and could explain the fact that efficiency remained uniform and high. Again, with large ullage volume (and empty tank), all of the injection modes tend to an efficiency value of about 50% of the ullage heating prediction.