Correlation in the Near and Far Field of Compressible Jet to Identify Noise Source Characteristics

Nikam, Shailesh R.; Sharma, S.K.

doi:10.1007/s10494-021-00299-2

Cited by 4 publications

(1 citation statement)

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“…Due to the complexity of the acoustic wave generated by the fluid, the theoretical simulation may not apply to various working conditions that generate acoustic waves. Therefore, experimental research is also essential for aerodynamic acoustic source research [16,17]. In addition to the acoustic wave generated by the airflow modulation, which is similar to the human voice, the aerodynamic acoustic source also has the acoustic of jets [18][19][20], high-pressure air flowing through some components [21,22], and so on.…”

Section: Introductionmentioning

confidence: 99%

A high-intensity low-frequency acoustic generator based on the Helmholtz resonator and airflow modulator

Zhang,

Dong,

et al. 2024

PLoS ONE

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The high-intensity low-frequency acoustic sources have essential applications in acoustic biological effects research, airport bird repelling, and boiler ash removal. However, generating high-intensity low-frequency acoustic waves in open space is difficult. In this paper, a low-frequency acoustic generator with a resonant cavity used to enhance the acoustic intensity in open space was developed, which is an aerodynamic acoustic generator to radiates a high-intensity acoustic wave of 52Hz. Some experiments were carried out to measure this generator’s internal flow field and radiated acoustic field characteristics, including the propagation characteristics at 100m. The experimental results show that the resonant enhancement effect is presented near the predetermined resonance frequency, and the enhanced value is about 4dB. The acoustic intensity for 52Hz at 1m position is 124dB. By combining the Helmholtz resonator with the airflow modulator, the airflow resonance in the resonator enhances the air pressure pulsation inside the chamber and increases the disturbance of acoustic radiation to the air. So as to improve the sound intensity and radiation efficiency in the low-frequency range.

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