Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Stability Analysis Of Compressible, Binary, Planar Jets Using DNS and LST Methods
Submission Author:
Vinícius Hagemeyer Chiumento , MG
Co-Authors:
Vinícius Hagemeyer Chiumento, Leandro Franco de Souza, Josuel Kruppa Rogenski, Marcio Teixeira de Mendonca
Presenter: Leandro Franco de Souza
doi://10.26678/ABCM.COBEM2019.COB2019-1420
Abstract
A binary jet is a fluid flow of a given chemical species moving with a higher velocity than the surrounding ambient that has another chemical species. Binary flows are very common in combustion systems where a high homogenization of the fluid mixture is desired and the mixing could be enhanced by turbulence. The stability theory analyzes the growth of small disturbances that lead to transition between laminar flow and turbulent flow. The stability of compressible, binary, planar jets composed by oxygen and hydrogen are analyzed in this study using Direct numerical simulation (DNS) and Linear Stability Theory (LST). The DNS simulations consider eigenfuctions provided by the linear stability theory. The amplification rates obtained by both methods are compared and show good agreement. The varicose and sinuous modes are analyzed and show that the sinuous modes has a higher amplifications rate than the varicose mode.
Keywords
Laminar-turbulent transition, direct numerical simulation, compressible jets, binary mixture, Linear stability theory
