Self-sustained oscillations in a homogeneous-density round jet |
| |
Authors: | A Boguslawski A Tyliszczak S Drobniak D Asendrych |
| |
Institution: | Faculty of Mechanical Engineering and Computer Sciences, Institute of Thermal Machinery , Czestochowa University of Technology , Czestochowa , Poland |
| |
Abstract: | The paper is devoted to a new phenomenon of self-sustained oscillations triggered in a round free homogeneous-density jet. It was shown by the experimental investigations supported by the numerical approach based on extensive-Large Eddy Simulations studies that such a self-sustained regime can be established in a homogeneous-density jet, provided that the boundary layer at the nozzle exit is sufficiently thin and the perturbation level sufficiently low. The growth rate of the naturally amplified unstable modes is high enough to induce backflow leading to self-excited oscillations. |
| |
Keywords: | round jet instability Kelvin–Helmholtz instability LES |
|