井底冲击压力特性的研究

STUDY ON PRESSURE CHARACTERISTICSOF IMPINGING JET ONTO BOTTOMHOLE

运用数值模拟的方法研究了单喷嘴射流撞击井底时产生的冲击压力及其分布规律。研究结果表明，井底最大冲击压力梯度所在的位置距撞击中心约０．１１４倍喷距处，井底最大冲击压力梯度和射流喷速成正比，和喷距成反比，本文绘出了其数学表达式。数值计算结果和室内实验数据吻合较为一致。

The theoretical analysis, numerical simulation and labrotory test are came'd out on thepresure characteristics of a turbulent submerged axisymmetric impinging jet onto the bottomhole. It is shown that the point of maximum pressure gradient is 0. 114 times stand--off distance to the stagnation point, and this maximum pressure gradient is proportional to jet exitvelocity and inverse proportional to stand - off distance. The numerical resuts agree wellwith experimental results.