Abstract
Hybrid rocket motor/engine forms a boundary layer combustion in the chamber because it is composed of liquid oxidizer and solid fuel. Liquefying polymers like paraffin are recently employed as hybrid rocket fuel due to higher regression rate compared to conventional fuels. The observation studies of combustion flame on liquefying fuel surface were conducted at low oxidizer mass flux. And its combustion detailed process is still unclear. Therefore, to examine the melting fuel behavior, a two-dimensional chamber with observation window was performed at GOX 104 kg/m2s and PC 2.0 MPa. In addition, the temperature profiles near the fuel surface were measured using a thermocouple. Distance between fuel surface and flame zone affected by GOX was obtained using thermocouple technique.
