Numerical Simulation and Modeling of a Muffler
Abstract
The problem of attenuating the noise from weapons firing was studied, experimentally and numerically. As a possible method of attenuating the noise significantly, a silencer with no internal baffles was attached to the M242 cannon. The internal pressures at selected locations inside the muffler were measured. The near field overpressures outside the muffler at various polar angles were also measured. A numerical simulation of the flow through the muffler was performed, using Harten's shock capturing method to solve the Euler equations of ideal compressible flow. The numerical simulation yields a detailed picture of the flow field as displayed by the pressure and Mach contours. Pressure-time curves obtained at selected locations are compared with experimental data. There is good agreement except that the numerical simulation generates more vigorous oscillations with higher peak values. As an aid to understanding the early flow processes in the muffler and as a design tool requiring little computational effort, a one-dimensional analytical model was constructed. Gun attenuators, Impulse noise, Computation fluid dynamics, Unsteady euler, Computations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1989
- Accession Number
- ADA206746
Entities
People
- Charlie H. Cooke
- Kevin S. Fansler
Organizations
- Ballistic Research Laboratory