数字全息在固体推进剂铝燃烧三维测量中的应用研究

In order to obtain the refined process of dynamic combustion of aluminum particles in the solid propellant, the digital holography technique is applied to the three-dimensional dynamic process measurement of aluminum combustion in solid propellant, which solves the problem of the small depth of the traditional optical direct imaging method. A digital holographic measurement system for aluminum combustion in solid propellant is developed, the experiments of the aluminum combustion are carried out under the pressure of 0.1MPa and 1.0MPa, and the holographic images of the 3D dynamic combustion process of aluminum particles in propellant combustion are obtained. The results show that the digital holography can obtain the particle information at different space planes, and track the dynamic combustion process of particles, obtain the particle size information accurately and realize the three-dimensional dynamic measurement. The holographic method can clearly distinguish more than ten micron to hundred micron scale aluminum particles in the dynamic combustion process, and the measurement error is less than 8%. After tracking the dynamic process of single aluminum particles, the variation laws of the particle size, space distribution, particle size distribution, combustion flame zone, particle velocity, and the dynamic formation process of the oxidation cap were clearly obtained. The establishment of this method can provide an effective three-dimensional experimental measurement method for studying the dynamic combustion mechanism of aluminum particles in solid propellant.