ABSTRAKT

The paper deals with results of experimental research concerning distributions of spectral density components of a longitudinal and transversal power of a turbulent near-wall jet's velocity fluctuations in the vortical chamber. A contribution of various frequency components of the spectral densities to the total energy of the velocity fluctuation field is shown vs. variable jet's tangential chamber entrance angles, azimuth angles against the inlet nozzle, and normal distances to the chamber's wall flowed around by the jet. A swirling stream's core is more saturated by small-scale high-frequency vortices in comparison with a near-wall jet field where large-scale vortical systems predominate. As the azimuth angle of an incoming jet increases, longitudinal vortex scales get bigger in a near-wall jet field, and their contribution to the total fluctuation energy grows.