Design of Self-Excited Oscillation Ultrasonic Nozzle and Experiment of Jet Frequency Characteristics
A self-excited oscillating jet model was established for ultrasonic nozzle based on fluid network theory.The frequency spectrum structure of self-excited oscillating jet was established by signal analysis.The induced mechanism of oscillation was sim-ulated and analyzed,and the variation characteristics of revealing jet frequency performance caused by different jet structures were studied.The results show that when the fluid disturbance frequency is close to the natural frequency of pipe network,the low frequency pulsation of jet is significantly enhanced.The self-excited frequency of the jet is close to the natural frequency of the noz-zle.The jet generated by the non-flaring nozzle is mainly characterized by low frequency oscillation,while the flaring nozzle is characterized by high frequency oscillation.The non-flaring nozzle forms a low frequency signal with high intensity,and the fre-quency component will not be changed by the confining pressure,and the amplitude is usually around 0.1MPa.Under the condi-tion of flaring nozzle,high frequency oscillating jet is formed,and its frequency and amplitude are significantly affected by con-fining pressure.Using high frequency oscillating jet in submerged state can effectively enhance the impact of jet on erosion.
Self-Excited Oscillating JetDevice StructureFrequency CharacteristicsLow Frequency PulsationHigh Frequency Oscillation
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