Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Stability of Binary Mixing Layers Under the Effect of Buoyancy Forces
Submission Author:
Yan da Silva Pedroni , SC
Co-Authors:
Yan da Silva Pedroni, Fernando Filho Fachini, Marcio Teixeira de Mendonca
Presenter: Yan da Silva Pedroni
doi://10.26678/ABCM.ENCIT2018.CIT18-0439
Abstract
Understanding the development of hydrodynamic instability in a free shear layer compose of two different chemical species is of utmost importance in aerospace propulsion for the development of more effective combustors. The differences between physical properties of each species, in special the density stratification in the presence of the gravity force, may influence the characteristic of the flow, affecting the growth rate of the disturbances and the flow topology. The present study considers the temporal stability of mixing layers using direct numeric simulation and compares results with results from the bibliography. The simulations show a damping effect of the growth rate with increasing compressibility and viscous effects, confirming previous results available in the literature. The effect of body forces due to density gradients is investigated and the results show that for the cases considered in this study there may be a stabilization of the mixing layer with a reduction of the order of 30\% for low values of the Froude number.
Keywords
Kelvin-Helmholtz instability, binary compressible mixing layer, irect Numeric Simulation, buoyancy force
