1.Abstract： Some related parameters of nozzel installation positi on and the influencing regulation of the slotting numbers of untwisted tube on the yarn strength were researched.

1.摘 要： 研究了气纺纱安装位置有关解捻管槽对成纱强力的影响规。

2.Fluid is conveied to bit nozzel through drill string from pump is a transient state flowing with pressure wave, which makes the fluid jetted out from nozzel has certain pulsation.

2.从钻井泵经过钻柱内部输送到钻的流体是一种瞬态流动，存在着压力行波，使从普通射出的流体有一定程度的脉动。