水力脉冲射流特性室内实验和数值模拟

水力脉冲射流是提高深井机械钻速的一种经济有效的方法,在分析水力脉冲空化射流发生器调制脉冲射流机理的基础上,采用室内实验和数值模拟两种方法对水力脉冲空化射流发生器所产生的脉冲射流特性进行了研究。着重研究了入口流量和叶轮叶片结构对该工具产生的脉动压力振幅的影响。室内实验和数值模拟结果表明：在同一叶轮结构下,随着入口流量的增大,脉动压力振幅呈增大趋势。在同一排量下,采用3叶片叶轮结构的工具调制出脉冲射流的脉动压力振幅较大。因此建议在现场试验条件允许的情况下尽可能地增大泵的排量,并且重点对3叶片叶轮结构的工具进行现场试验研究。

Study on hydraulic pulsed jet characteristic by in-house experiment and numerical simulation

Hydraulic pulsed jet is a cost-effective method to improve the rate of penetration（ROP） in deep well.Basing on analysis of pulsed jet modulation mechanism of hydraulic pulsed cavitation jet generator,we adopt in-house experiment and numerical simulation to research hydraulic pulsed jet characteristic which is generated by hydraulic pulsed cavitation jet generator.Our research focuses on the impact of the inlet flow rate and the number of blade impeller on the outlet pulsating pressure amplitude.The author arrives at the following conclusions.In the same impeller structure,the outlet pulsating pressure amplitude increases with the increase of inlet flow rate.Under the same delivery capacity,the outlet pulsating pressure amplitude which is modulated by 3 blade impeller structure tool is bigger.Therefore we suggest to increase the delivery of pump as much as possible in the field test.And we propose to focus on 3 blade impeller structure tool doing field test.