Numerical Investigation of the Acoustic Scattering Behavior of a Butterfly Valve

In this paper, the scattering behavior of a butterfly valve is investigated numerically. This is done within the multi-port characterization framework, where the transmission and reflection of all cut-on modes in the inlet and outlet duct is described by a scatter matrix relation. The multiport characteristics of the valve are computed using a set of independent simulations, carried out with an in-house Runge-Kutta discontinuous Galerkin solver for the linearized Euler equations in time-domain. In order to fully benefit from the time-domain formulation, the impulse response approach is used: a broadband pulse excitation is imposed and the simulation runs until all energy has left the system. The multi-port characteristics are computed from the time-history of the pressure, stored at a well-chosen set of positions in the inlet and outlet duct. Due to the multi-modal character of the multi-port framework, the application of the impulse response technique is less straightforward than in a plane wave propagation context. However, these issues can be overcome using appropriate signal processing techniques. In this paper, this approach is validated by comparing the simulated multi-port characteristics of a butterfly valve to an experimental reference, yielding a good agreement over the whole frequency range of interest.

Jaar van publicatie:2017

Toegankelijkheid:Closed