激光同轴送粉头喷出的粉末汇聚和分布特性直接影响激光制造的质量和精度。研究了同轴送粉时粉末分布规律和汇聚情况，提出了同轴送粉式粉末分布理论模型，开发了一种粉末流场检测系统，对喷嘴喷出的粉末汇聚情况和分布形貌进行了实时检测，结果表明，计算结果与实验测量结果比较吻合。通过系统观察和分析粉末流的汇聚和分布的实时变动行为，有利于更好地优化设计送粉头和控制激光制造过程。

Distribution of powder stream from coaxial nozzle directly affects the quality and accuracy of the parts by laser manufacturing. The convergent distribution of powder flow and powder convergent performance is researched. A theoretical model of coaxial powder nozzle is established. And a detecting system of powder stream field is developed to real- time measure morphology and concentration distribution of powder stream. The results show that the simulations of the powder flow agree well with the experimental measurements. The systemic studies on the behaviors of powder stream morphology and concentration distribution of powder stream help to optimize the design of coaxial powder feeding head and control laser manufacturing better.