To reveal the effect of particle size gradation on the loading characteristics and flowability of powder fuels and im-prove the working performance of powder ramjet engines,the effects of particle properties and grading methods on the loading characteristics and flowability of powder fuels were investigated taking boron-based powder fuels as research object.And the fluidized transport performance of the graded powder was verified by powder supply system.The results show that the filling of small-size particles in the gap of large-size particles can improve the filling density but reduce the flowability.When the small-size particles in the multi-stage graded powder are less flowable,the filling density of premixed graded particles is higher than that of batch filling method,and vice versa.The particle size distribution of boron-based powder fuel prepared by agglomera-ted granulation has the characteristics of fractal distribution.The fractal gradation method can also increase the particle filling density by about 15.7％,the fractal dimension after fractal grading is 2.33,filling density is 0.957g/cm3 and filling rate is 53.8％,maintaining good fluidization performance.
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