Abstract:

In the work by analysis of one-dimensional unsteady flows, based on the fundamental law of conservation with application of Fourier series is shown that in the presence of periodic, steady pulsations along the flow, the fundamental frequency as well as all higher frequencies remain constant and are changed only the amplitude of oscillations that is in full agreement with the results of analysis of more complex three-dimensional flows. Thus, is confirmed the validity of the principle of conservation of frequencies or time scale along the flow.

Keywords: frequency, time scale, preservation