CURRENT STATUS OF ROCKET DEVELOPMENTS IN UNIVERSITIES-DEVELOPMENT OF CAMUI HYBRID ROCKET

摘要

To enhance the gasification rate of hybrid rocket motor that is essential for its practical use in a small launcher, the authors have been developing a new type of hybrid rocket named CAMUI as an abbreviation of Cascaded Multistage Impinging-jet. The fuel grain in the CAMUI motor is a set of cylindrical fuel blocks with two ports in axial direction. To develop a prediction method of the regression progress in the CAMUI hybrid motor, the authors investigated regression progress of CAMUI fuel with a 70 kgf thrust class static firing test motor, varying liquid oxygen flow rate and burning duration. By adopting least square method to the experimental data, we obtained empirical constants in regression formulae for each burning surface. The calculated regression distances agree well with the experimental value, showing the validity of the obtained regression formulae. It is possible to predict the history of the fuel flow rate by using the regression formulae of burning surfaces, assuming that the regression of each surface progresses in one direction and independently. The predicted chamber pressure history is in good agreement with the experimental one, showing the validity of the method to predict the fuel gasification rate.