| In order to solve the problem of siltation in reservoir areas of silt-laden rivers in China,a self-excited inhaler pulse jet device with a strong effect of energy collection after inhalation was used to perform water jet technology for siltation of reservoir sediments.The jet technology can generate strong instantaneous impact force after inhalation,and it is beneficial to sediment disturbance in the bottom of the reservoir.In this paper,the impact test of the self-excited inhaled pulsed jet device under submerged conditions was carried out.The effect of different working pressures and the dimensionless structural parameters of the nozzle on the impact characteristics of the self-excited suction pulse jet was studied by using time-frequency analysis techniques:(1)The time-frequency characteristics and energy spectrum distribution of the impact pressure signal for the self-excited suction pulse jet nozzle were analyzed.The effects of working pressure on the nozzle impact pressure,pressure pulsation frequency and amplitude,impact energy were obtained.(2)The time-frequency characteristics of the impact pressure under suction and non-aspirate conditions were compared and analyzed.The magnitude of the impact force after the suction,the amplitude of the impulse pressure fluctuation signal,the pulsation frequency,and the energy of the impact force were significantly higher than those without suction.(3)The influence of dimensionless structural parameter matching on the time-frequency characteristics and energy spectrum distribution of impact force under different working pressures was studied,and the dimensionless structural parameter ratio range with the best time-frequency characteristics of impact pressure was obtained.The research results in this paper provide the theoretical basis for the optimization of the structural parameter ratio optimization of the underwater self-excited inhaler pulse jet nozzle under changing working pressure. |
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