Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Mixing Layer Stability Analysis With Strong Temperature Gradients
Submission Author:
Matheus Silva , RS , Brazil
Co-Authors:
Matheus Silva, Cesar Cristaldo, Jhonatan andres aguirre manco , Fernando Filho Fachini, Marcio Teixeira de Mendonca
Presenter: Matheus Silva
doi://10.26678/ABCM.ENCIT2018.CIT18-0455
Abstract
The stability of compressible flow relevant to aeronautical applications are investigated regarding the effect of large temperature gradients. The temperature gradients when large are responsible for strong variations in gas properties such as density, viscosity and conductivity. Theses variations change the characteristics of the flow both in terms of its stability parameters such as growth rate and in terms of the flow topology and vorticity distribution. Direct numerical simulations and linear stability theory are used as tools for the intended study. Preliminary results show the stability characteristics of a chosen reference flow configuration against which the large temperature gradient cases will be compared to. Vorticity, pressure distribution and normal velocity components are presented for a range of Reynolds numbers for the reference flow configuration. The final paper will present results for the effect of Mach number and different temperature distributions leading to stabilizing and destabilizing density gradients, as well as a model problem with large temperatures at the center of the mixing layer, mimicking the effect of chemical reaction.
Keywords
Kelvin-Helmholtz instability, compressible mixing layer, direct numerical simulation
