The attenuation of sound propagating through a radial diffuser with absorptive walls

An analytical model for acoustic propagation through an idealized radial diffuser under zero flow conditions has been developed. The model has been used to generate a computer program which is capable of predicting radial attenuation for a variety of diffuser wall impedance combinations. Numerical results are presented for the following three cases: (i) one hard diffuser wall and one finite impedance wall, (ii) equal finite impedance diffuser walls, and (iii) unequal finite impedance diffuser walls. The results for cases (i) and (ii) are found to be in good agreement with analytical results from the literature.