The critical length of the powder flow tube for the equal dliameter nozzle is determined by Mach Number check method and factors affecting the clogging of powder flow discussed by calculation of the numerical values.

• 采用马赫数检验法确定等直径管中气粉流的临界管长,并通过数值计算结果讨论各种因素对气粉流壅塞现象的影响。