Abstract: The burning rate of pyrotechnic composition of implosive thruster is measured by optical fiber speed-measuring technique, and the effects of the proportion of components and the main charge density on burning rate are studied. The pressure exponent of burning rate is measured by closed-bomb test. The results show that the burning rates of pyrotechnic compositions with different proportions are different at initial stage and are tend to be the same at later stage, and the burning rate increases first and then decreases with the increase in main charge density. The maximum burning rate of pyrotechnic composition can reach 800 m/s at the density of 1.45 g/cm³. The pressure exponent of burning rate is 0.736 4 in the test pressure range. It shows that the pyrotechnic composition can burn stably in a certain pressure range and can satisfy impulsive thrust requirement. Key

Key words: pyrotechniccomposition, opticalfibertest, burningrate, pressureexponent