中文摘要：

针对堆积粉料的破散性问题,在设计和构建高压气体射流冲击试验装置的基础上,开展了射流形态、射流喷距和射流冲击实验,探讨了射流压强、喷距、时间、喷嘴形式及喷嘴个数对堆积粉料的破散效果。试验结果表明,当微孔喷嘴直径为0.5 mm时,相同条件下9孔喷嘴的冲击坑体积约为单孔喷嘴的5倍、穿透深度约为单孔的1.5倍。在综合考虑冲击性能、经济成本等因素时,对于孔径为0.5 mm的单孔喷嘴,其最佳工艺参数为喷距20 mm、压强0.5 MPa;最后采用Fluent模拟了单孔喷嘴的冲击过程,得到的仿真结果与实验结果两者之间非常吻合。

英文摘要：

In order to solve the broken dispersion problem of bulk powder,a jet impacting test device with high pressure air has been designed and constructed to develop the test of jet pattern,jet distance and jet impingement.Experiments were conducted to study the broken dispersion effect of jet pressure,jet distance,time,form of nozzle and nozzle number on bulk powder.When the microstructure nozzle diameter is 0.5 mm,the experimental results show that the impact crater volume of nine-hole nozzle is about 5 times of the single-hole nozzle and its penetration depth is about 1.5 times under the same conditions.In the integrated system to consider the impact performance,economic cost and other factors,for single-hole nozzle that diameter is 0.5 mm,its optimal process parameters are that the jet distance is 20 mm,the pressure is 0.5 MPa.Finally,using Fluent software the impact process of singlehole nozzle is simulated,the simulation results were in good agreement with the experimental results.