Further technological optimizations
Thermoacoustic converters

In addition to the above choices, satisfactory performance also depends on a number of precautions: minimizing all causes of loss.

• Reducing viscous losses: the first point in obtaining sufficient performance from a thermoacoustic machine is to reduce the acoustic impedance $\raisebox{1ex}{$p_{\text{r}}$}\!\left/ \!\raisebox{-1ex}{${\overline{u}}_{\text{r}}$}\right.={\overline{\rho }}_{\text{g}}c$ of the regenerative stack, otherwise excessive speeds will generate prohibitive viscous losses. For example, when using standing...