Simulation Study on Resonant Cavity Structure based on Hartmann Whistle Ultrasonic Nozzles
In order to study the dehumidification problem of steam turbine by the expermiental method,a new type of nozzle with large flow rate and high atomization degree was designed,and a resonant cavity structure similar to Hartmann whistle was incorporated into the nozzle design,hoping to enhance the at-omization effect of water droplets through the ultrasonic effect.The fluent fluid simulation software was used to numerically simulate the velocity,pressure pulsation and resonant frequency of the flow field un-der different Hartmann whistle resonant cavity structure sizes,and the optimal resonator layout structure size was obtained.The results show that when the nozzle inlet pressure is constant,changing the angle between the resonant cavity and the nozzle outlet(i.e.resonant cavity angle)increases the velocity pul-sation with the increase of the resonant cavity angle,while the pressure pulsation increases first and then decreases with the increase of the resonant cavity angle,reaching a peak at an angle of 125°;the maxi-mum velocity pulsation region and resonant frequency decreases with the increase of resonant cavity diam-eter;the structural parameters of the resonant cavity are finally determined that its angle is 125°,diame-ter is 3.4 mm and depth is 6.4 mm;the resonant frequency under this structure parameter is 21 kHz,which meets the required frequency.
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