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Keywords: The self-excited oscillation pulsed jet, numerical simulation, crush experiment. Abstract. Nearly 40 years, high pressure water jet technology has developed rapidly and increasingly(1,2), and it also added new methods to foundation engineering and geotechnical engineering for our country(3,4,5), such as High pressure jet grouting(6) and coal or ore mining(7,8), so choose what kind of jet can be more effective to crush rock became the focus of researching(9,10). In this paper, using the Fluent software numerical simulation technology to research the inlet velocity of jet from 5 m/s to 300 m/s and hit a target from 100 mm to 800 mm, exploring the hit force variation rule of oscillation pulsed jet. Then according to the variation curve draw force formula. Put forward that in the low velocity using exponential function fitting, and high velocity using the polynomial function fitting. Then tested self-excited oscillation pulsed jet force, the results is similar to the numerical simulation. And finally do contrast experiment between self-excited oscillation pulsed jet and consecutive jets, found that at low pressure condition, self-excited oscillation pulsed jet can crushing rock easier.

Simulation and Experimental Study on the Self-Excited Oscillation Jet Device