摘要
基于水声学和流体动力学原理,分析了自激振荡射流中碰撞剪切流动压力扰动波的传播速度及其对射流振荡频率的影响规律,建立了振荡腔内脉冲射流频率的数学模型,得出了声压、流体密度以及模态数是影响射流频率的关键因素。为获得更为有效的冲击压力和破岩效率,从提高脉冲射流瞬时峰值出发,研究射流频率和射流压力峰值的实际影响因素。实验采用SD150测试系统主要研究了泵压和自激振荡腔长对射流频率的影响。实验结果表明:泵压升高,射流频率增加;腔长增大,射流频率降低。另外,存在一个最佳腔长使脉冲射流压力峰值达到最大。实验结果与理论分析一致。
On the basis of hydro-acoustics and fluid dynamics, this paper analyzed the disturbance wave of impinging shear flow pressure and its effects on frequencies of the self-excited oscillation jet, developed the model of the jet oscillating frequency, and concluded that the key factors affecting jet frequency include audio pressure, fluid density and mode number. In order to get more effective impact pressure and higher rock-cutting efficiency, the actual factors affecting the jet frequency and peak value of jet are investigated from the aspect of improving instantaneous peak value of jet. The effects of pump pressure and the length of the oscillation cavity on the jet oscillating frequency are studied using SD150 test system. The test results clearly show that the oscillating frequency increases with increasing pump pressure and decreases with increasing oscillation cavity length. In addition, there is an optimum length of oscillation cavity corresponding to the peak value of the self-excited oscillation pulsed water jet. The experimental results show no difference with theoretic analysis results.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2007年第11期55-57,共3页
Natural Gas Industry
基金
国家自然科学基金项目(编号:50374087)
湖南省教育厅重点项目(编号:04A067)的资助
关键词
喷射钻井
自激振荡脉冲射流
速度
喷嘴
频率
研究
jet drilling, self-excited oscillation pulsed jet, speed, nozzle, frequency, study
