Effects of pulsating fluid at nozzle inlet on the output characteristics of common and self?excited oscillation nozzle

High-speed water jets are key technologies for increased production efficiency in oil drilling, and high-speed self-excited oscillating pulsed (SEOPWs) offer many advantages compared to continuous most industrial applications. Therefore, studies have focused on this topic. However, the current hydraulic rarely extended integrated modeling of jet transmission process. To better apply SEOPWs, based fluid mechanics, theoretical model plunger pump–pipeline–nozzle is established, sensitivity different nozzles pulsating studied time domain. Furthermore, vibration characteristics nozzle further investigated frequency The results show that common has an enlarged role pressure amplitude, Helmholtz enlarges peak amplification more obvious with speedy growth pump. as pipeline becomes longer, difference between inlet outlet does not change. sensitive change pump speed. In domain, secondary 1.26 times larger than interference frequency, while it 1.08 nozzle. tend produce stronger natural vibrations nozzles. By comparing impact force, experimental good agreement simulated results. study provides a basis jet-assisted drilling deep wells lays foundation application self-oscillating tools.