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Investigation of the effects of volume change on flow structure and acoustic in a silencer.
- Source :
-
International Journal of Aeroacoustics . Nov2023, Vol. 22 Issue 7/8, p639-655. 17p. - Publication Year :
- 2023
-
Abstract
- This study numerically examined the propellant flow from gunfire using the kω-SST turbulence model and their sound attenuation using the Ffowcs-Williams and Hawkins equations (FW-H). For simulation, a pressure-based solver and 3D axisymmetric geometry were used. The second-order implicit time approach and the second-order upwind scheme spatial discretization were used in the simulation. The maximum exit pressure was 3.748 MPa for the suppressor with a length of 70 mm and diameter of 20 mm. However, when the diameter suppressor increased by 1/6, the maximum exit pressure was reduced to 3.4961 MPa. When the length increased by 1/6, the maximum pressure became 3.3636 MPa. Lastly, when the diameter and length were increased by 1/6, the maximum exit pressure became 3.177 MPa. For this suppressor, 20.835 dB (12.29%) sound pressure level attenuation was achieved with 16.823 MPa (84.115%) overpressure reduction and 484.86 K or 32.32% temperature reduction. Generally, the attenuation increased with the increase in the suppressor's internal volume. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PROPELLANTS
*GUNFIRE
*TURBULENCE
*SOUND pressure
Subjects
Details
- Language :
- English
- ISSN :
- 1475472X
- Volume :
- 22
- Issue :
- 7/8
- Database :
- Academic Search Index
- Journal :
- International Journal of Aeroacoustics
- Publication Type :
- Academic Journal
- Accession number :
- 174062750
- Full Text :
- https://doi.org/10.1177/1475472X231206497