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本文利用流体阻抗法对几种常见管系提供了求其固有频率的分析和计算方法。在此基础上,设计了一种产生共振射流的适用装置,并对所产生的共振射流的结构及其打击效果进行了一系列的试验研究。瞬态压力测试表明,共振射流具有强烈的压力脉动特性,在喷咀处共振射流的峰值压力可比压力平均值提高一倍左右,而且理论预测的管系固有频率与实测的结果基本一致;高速摄影结果表明,共振射流是由一串前峰粗大而又密集的液珠所组成的。最后又通过测试其冲击压力和进行实际的切割煤样的试验,证明共振射流的打击力与打击效果都比普通连续射流提高一倍左右。因此,共振射流在水力采煤中的应用是有其优越性的。
In this paper, the fluid impedance method for several common pipelines to find its natural frequency analysis and calculation methods. Based on this, a suitable device for generating resonance jet was designed, and a series of experimental studies on the structure of the generated resonance jet and its blow effect were carried out. The transient pressure tests show that the resonance jet has a strong pressure-pulsation characteristic. The peak pressure of the resonance jet at the nozzle can be double that of the average pressure, and the theoretical natural frequency of the tube system is basically consistent with the measured one. High-speed photography The results show that the resonant jet consists of a series of thick and dense liquid beads. Finally, by testing the impact pressure and actual cutting coal samples, it is proved that the striking power and the striking effect of the resonance jet are both doubled than that of the ordinary continuous jet. Therefore, the application of resonance jet in hydraulic coal mining has its advantages.