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.
从钻井泵经过钻柱内部输送到钻头
流体是一种瞬态流
，存在着压力行波，使从普通射出流体有一定程度
。
搏;悸
;；压力冲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.
从钻井泵经过钻柱内部输送到钻头流体是一种瞬态流，存在着压力行波，使从普通射出流体有一定程度。
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