Abstract
A hypersonic flight experiment by a combination of a scientific observation balloon and a CAMUI-type hybrid rocket is proposed. This is one of the rockoon methods. In this experiment, liquid oxygen (LOX) is filled on the ground and thermally insulated until the launch in high altitudes. The gas phase volume in the LOX tank decrease with time due to heat input from ambient. Eventually, the gas phase disappears, followed by a sudden increase of the LOX tank pressure. The heat insulation of the LOX tank has to provide no less than five hours from the LOX filing to the sudden pressure increase. In this study, a numerical model to predict pressure histories in the LOX tank was developed. The results were compared and verified with experimental results in a small scale. Finally, pressure histories at a full-scale system were predicted to provide a guideline for the design of a thermal insulator.
