Solution For Acoustic Field Research Articles

Analytical solutions for the acoustic field in a thin annular duct with temperature gradient and mean flow

The analytical solution for the one-dimensional acoustic field in a straight duct with arbitrary mean temperature gradient and mean flow has been recently derived based on an adapted WKB approximation (J. Li, A.S. Morgans, J. Sound Vib. 400 (2017) 248–269 [12]). These solutions reproduce the acoustic field very accurately across a wide range of flow conditions. These approaches are applied herein to a more complex configuration – a thin annular duct with arbitrary mean temperature gradient and mean flow; this is a common element (e.g., the annular combustion chamber) used in gas turbines and aero-engines. The derived analytical solutions are also validated on similar configurations and by using the same methods as our previous work.

Solution for acoustic field of thermo-acoustic emission from arbitrary source

In this work, an expression for acoustic field of thermo-acoustic (TA) emission from arbitrary source is presented by deriving the solutions of TA emission from spherical surface and point source in gas and then taking advantage of the point sources superposition and the surface heat distribution factor. Accordingly, the computational analysis of acoustic pressure field of TA emission is extended to three-dimensional cases. The theory developed in this work is in good agreement with the experimental results and applicable for solving many complex and important TA emission problems including nanothermophones and phased array and impulse-driven TA emissions.

Investigation of acoustic field near to elastic thin plate using integral method

Investigation of acoustic field near to elastic thin plate using integral method The influence of boundary conditions on sound wave propagation, radiation and transmission through thin elastic plate is investigated. Necessary for that numerical model was found using the Helmholtz equation and equation of oscilated plate by means of integral formulation of the solution for acoustic fields near to elastic thin plate and for bending waves of small amplitudes.