摘要：

Thermoacoustics deals with the acoustics of flows in which the variation of entropy plays a significant role. A range of processes are thermoacoustic sources. For example, unsteady combustion, diffusion of heat and mass and turbulent two-phase flows all generate sound. Chapters 11 and 12 demonstrate how the Lighthill theory provides a convenient description of sound generation. There we saw in Equation (11.46), for example, that the Navier-Stokes equation and the equation of mass conservation may be combined to give an inhomogeneous wave equation for the density fluctuations. When investigating thermoacoustic source processes it is convenient to use the pressure perturbation as the dependent variable.

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