High pressure hydraulic pulse is effective to deal with some engineering problems such as hydraulic breaking rock and cutting metals. This paper advances a novel rotary ball pulsing nozzle based on whistle principle in daily life. The mechanism of pulse activated by this novel rotary ball pulsing nozzle is pretty complex. In order to check up its effect, a high-pressure pump with 50 m3/s flow is used to experiment on the pulsing nozzle, and the results are compared with the high pressure efflux produced by general nozzles. Experiment indicates that the novel rotary ball pulsing nozzle can produce high frequency pulse, while the efflux produced by general nozzles is common turbulent flow with no obvious pulse; the fluctuating pressure produced by this novel rotary ball pulsing nozzle is far higher than the high pressure efflux by general nozzle, thus it is in favor of breaking rocks or metals. The experimental study has considerable reference value in engineering design.
