关键词: 固体推进剂;铝燃烧;同轴数字全息;图像重建;概率密度粒径分布

Abstract: In order to obtain the particle sizes of three-dimensional dynamic combustion of aluminum particles in the solid propellant， a new method used digital in-line holography（DIH） techniques for measuring the size of aluminum particle during solid propellants combustion was studied.Under normal pressure and temperature， two propellants were measured with two magnification times （1.1 times and 2.7 times） DIH system， the particle size information of all aluminum combustion particles was extracted from the holographic reconstructed image， and the detailed parameters of particle size distribution were obtained by Log-Normal multi-peak fitting method. The experimental results show that: Based on the particle reconstruction hologram image， the measurement accuracy of particle size is greatly improved by interpolation method， and the relative measurement error can be reduced to 0.4% in the range of 10μm～200μm. The method can clearly obtain the information such as particle size distribution and average particle size of all the aluminum combustion particles in the range of 10μm～900μm， and it is proved that this method is suitable for refine measurement of the aluminum particles combustion in solid propellant. So， it can provide fine measuring means and important data support for inform aluminum and agglomeration combustion model and evaluate new propellant formulations.

Key words: Solid propellant;Aluminum combustion;Digital in-line holography（DIH）;Image reconstruction;Particle distribution function（PDF）