It is common to add boron particles into the gas generator to get a high specific impulse. However, the combustion efficiency of boron as a fuel is insufficient because of the poor ignition characteristics of boron particles. We know that the combustion efficiency rose by adding magnalium particles in the gas generator with boron. Because the ignition temperature of magnalium particles is lower than that of boron, it is thought that magnalium possibly promoted the ignition of fuel rich hot gas with boron. Therefore this study focuses on the ignition delay time of boron and magnalium particles, and the effects that magnalium gives to the ignition characteristics of fuel rich hot gas with boron. The ignition delay time of particles was measured with an electronic furnace, and the ignition delay time of fuel rich hot gas with boron was obtained by using a direct connected pipe ducted rocket. We made clear that the chemical ignition delay time of magnalium particles is shoter than that of boron particles. The ignition delay time of fuel rich hot gas with boron decrease with increasing the concentration of magnalium.
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