Experimental study of the influence of annular nozzle on acoustic characteristics of detonation sound wave generated by pulse detonation engine

Kang, Yang; Li, Ning; Huang, Xiaolong; Wang, Chunsheng

doi:10.1088/1674-1056/ac80a9

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…; r = 0.2 m and 0.4 m from the center of the cavity under a wind speed of 4.4 m/s. It is observed that the sound pressure level at a distance radius (r) of 0.2 m is higher than at a distance radius (r) of 0.4 m. This suggests that the acoustic wave gradually increased with a near distance of the source of noise [95]. This figure also reveals that the obvious directivity location can be observed for both distances at 0° and 45⁰ intervals, with 2.9 dB and 4.9 dB differences, respectively.…”

Section: Influence Of Wind Orientation Anglementioning

confidence: 92%

Co-simulation approach for computational aero-acoustic modeling: Investigating wind-induced noise within two-way radio microphone ports cavity

Hairudin,

Mat,

Ooi

et al. 2024

J. Mech. Eng. Sci.

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Wind-induced noise (aeroacoustic) can cause problem with any outdoor microphone applications, notably impacting the performance of telecommunication mobile. One prominent source in two way radios is the microphone port cavity. In this article, the noise characteristics behaviour is studied at scale-up of microphone port cavity through computational aero-accoustics (CAA) numerical simulation and experimental test. This research aims to investigate the wind-induced noise (aeroacoustic) generated inside the microphone port cavity at various wind orientation angles (wind direction) and distance radii, r. A direct-hybrid co-simulation CAA method, utilizing the LES-WALE (Wall-Adapting Local Eddy-viscosity) and Ffowcs William-Hawking (FW-H) models, is employed to obtain the near-field noise source and far-field noise patterns inside a microphone port cavity. The simulations are conducted using the scFLOW2Actran software. Richardson extrapolation and Grid Convergence Index (GCI) are applied to evaluate the accuracy of the grid independency in numerical simulations.The findings reveal that the leading edge, centre and trailing edge are the primary noise sources and generations inside a microphone port. The study indicates that the noise level in the microphone port cavity is characterized by low frequency noise.The results indicates that at an observation of angles of 0° and distance radii of 0.2 m, the wind noise level is higher compared to other orientation angle and distance radii. This can be attributed to the proximity to the noise source at this location. The directivity pattern of noise propagation exhibits a typical dipole pattern observed at observation angles of 0° to 45°. Numerical results align well with the experimental results from the wind tunnel test, demonstrating the feasibility of the proposed approach for flow-acoustic coupling application. This research holds significant value for engineers as it provides a comprehensive understanding of the physical phenomena involved in microphone port design.

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Section: Influence Of Wind Orientation Anglementioning

confidence: 92%

Co-simulation approach for computational aero-acoustic modeling: Investigating wind-induced noise within two-way radio microphone ports cavity

Hairudin,

Mat,

Ooi

et al. 2024

J. Mech. Eng. Sci.

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Pressure field characteristics of underwater detonation gas jet below and above free water surface

Wei

Li²,

Huang³

et al. 2023

Experimental Thermal and Fluid Science

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Experimental study on the transmission characteristics of near-field detonation noise into water

Wei

Kang

et al. 2022

Physics of Fluids

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To study the transmission characteristics of near-field detonation noise into water, the detonation noise transmission system is built on a laboratory-scale water tank using a detonation tube with a diameter of 30 mm. The interaction of the detonation gas jet with the air-water interface, the development of the cavity and the growth of the liquid column are experimentally observed by a high-speed camera. The spectral distribution characteristics of detonation noise above and below the interface are recorded by a microphone, a hydrophone and an underwater blast sensor. Analysis of the experimental images shows that the size of the cavity increases with increasing filling pressure and decreases with increasing nozzle height. By normalizing the evolution time of the cavity with the cavity lifetime, it is concluded that the time for the cavity to develop to the deepest is about 0.27, independent of the filling pressure. The pressure field data analysis results show that the main frequencies of the detonation sound waves are 100 Hz and 400 Hz, and the frequency distribution has nothing to do with the filling pressure. Through the defined acoustic wave energy transmission coefficient, it is demonstrated that the detonation acoustic wave transmission coefficient decreases with the increase of the frequency, and the shock wave transmission coefficient decreases with the increase of the angle.

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Experimental study of the influence of annular nozzle on acoustic characteristics of detonation sound wave generated by pulse detonation engine

Cited by 3 publications

References 21 publications

Co-simulation approach for computational aero-acoustic modeling: Investigating wind-induced noise within two-way radio microphone ports cavity

Co-simulation approach for computational aero-acoustic modeling: Investigating wind-induced noise within two-way radio microphone ports cavity

Pressure field characteristics of underwater detonation gas jet below and above free water surface

Experimental study on the transmission characteristics of near-field detonation noise into water

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