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： 研究了喷气纺纱喷嘴安装位置有关参数及解捻管槽数对成纱强响规。

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.从钻过钻柱内部输送到钻头喷嘴流体是一种瞬态流动，存在着压行波，使从普通喷嘴射出流体有一定程度脉动。