Ignition and combustion charateristics of boron-containing fuels in mini-tubes

In order to study the ignition and combustion charateristics of several boron-containing fuels with ammonium perchlorate as the oxidizer in mini-tubes, the high-speed camera and the fiber spectrometer were used, and the moving speed was calculated with high-speed image processing using the software of GRAFULA. The results show that: for boron-containing fuels, when the mass ratio of B is 1/2, combustion is sustainable, uniform and stable with the burning rate of 4.25 mm/s; when the mass ratio of B is 2/3, 3/4 and 4/5 respectively, the latter half of fuels is sprayed from tubes; when the mass ratio of B is 5/6, reaction is not continous. And with the increase of the mass ratio of B spectral intensity weakens, sustainable combustion time shortens, the moment of the most¹ dramatic burning advances, and reaction intensity and stability decreases. So the difficulty of stable ignition and combustion of propellant in micro-propulsion system can be overcomed by the reasonable prescription of boron-containing fuels.