Abstract
Acoustical instability of the inhomogeneous heat-emitted gas flow in dependence on the Mach number is investigated. Obtained acoustical equations for perturbations of velocity, density, pressure, and temperature have diff erent forms in inhomogeneous media. Growth increments for these perturbations diff er from each other as well. They are significantly dependent on the Mach number and the flow direction. The features of sub- and supersonic acoustics are considered.
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