Abstract
The dynamic impact of a water jet with a periodically changing structure can be used in various industries. The paper presents a design solution for a self-excited pulse head. This head can be used in mining for drilling holes and breaking rocks. The design of the head was developed based on computer simulations, which made it possible to learn the mechanism of impulse shaping inside the head. Tests of the water jet produced in the self-excited pulsation head showed the occurrence of periodic changes in its internal structure and pulsation frequency. A significant increase in the dynamic stream pressures was demonstrated for the head working in the water environment compared to the head working in the air environment For example, for nominal medium and highest pressures, this increase is up to 82%, while for the lowest pressures (10 MPa), the pressure force values increase by 46%. It was found that an increase in the nominal water pressure causes a decrease in the frequency of hydrodynamic pulses in the head operating in both the water and air environment.
Highlights
The use of pulsating water jets in mining is a new issue
The frequency of the occurrence of water pulses in the pulsating water stream, generated in the self-excited pulsed head intended for drilling holes, was registered with the use of aThe piezoelectric forceof sensor
The distributions of velocity and pressure vectors as well as the shape of the vortex rings inside the head chamber with side openings situated at an angle of 120° do not
Summary
The use of pulsating water jets in mining is a new issue. There are many varieties of hole drilling technology using a high-pressure water jet. The impulse water jet is used, among others, in drilling technology. There is still a search for better solutions for the use of a pulsed jet in the drilling technology in oil mining [2,3]. A pulse head with specific geometrical parameters of the vortex chamber is usually used to generate such a stream. The advantage of such heads is the lack of moving parts. The most important technical problems include the strong dependence of the stream properties on the design parameters of the self-excited pulse heads
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
