Study on noise characteristics and mechanism of supersonic aerodynamic spray technology
To explore the noise characteristics and noise-causing mechanism of supersonic aerodynamic spray dust removal technology,this study adopts the experimental method and uses the YSD130 noise analyzer to measure the noise of supersonic coaxial atomization dust removal device.By comparing the airflow noise and spray noise at the sound source under different working conditions and parameters,the spectrum characteristics and changes of the noise under different pressure and water flow rates are analyzed.The research shows that the supersonic dynamic spray noise is mainly high-frequency noise,and the sound pressure level increases with the increase of frequency,and the average noise is 110.1 dB,which will cause damage to the human hearing system.In the process of atomization,the distribution of the noise spectrum is determined by different atomization amounts and atomization levels.The atomization amount determines the increase and decrease trend of sound pressure level,and the atomization level determines the different noise frequency bands.At 0.3 MPa,the particle size distribution of the droplets is large,and the atomization effect is relatively poor,which increases the sound pressure level of the low-frequency band(＜500 Hz),and long-term contact is likely to cause symptoms such as neurasthenia,insomnia,headache,etc.At 0.4 MPa,the particle size distribution of the droplets is small,and the atomization effect is more efficient,increasing the sound pressure level of the middle and high-frequency band(≥500 Hz).Long-term exposure to this environment is likely to cause vocal cord fatigue,vocal cord inflammation,and other symptoms.Under the same water flow,with the increase of aerodynamic pressure,the sound pressure level of supersonic aerodynamic spray noise increases first and then decreases.Under the same pressure,with the increase of water flow,the sound pressure level of different frequency bands increases first and then decreases.The decrease in airflow energy and interlayer relative velocity is the main reason for the decrease in noise intensity.When the water flow rate is 60 mL/min and the aerodynamic pressure is 0.4 MPa,the noise parameters are the largest,especially the peak sound pressure level reaches 132.2 dB.
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