EPTT 2020

12th Spring School on Transition and Turbulence

Instability of Binary Subsonic Coaxial Jets

Submission Author: Jhonatan andres aguirre manco , SP
Co-Authors: Jhonatan andres aguirre manco , Marcio Teixeira de Mendonca
Presenter: Jhonatan andres aguirre manco

doi://10.26678/ABCM.EPTT2020.EPT20-0011

 

Abstract

The performance of rocket engines depends strongly on the proper injection and mixing between fuel and oxidizer. The injection of liquid propellants like oxygen and Hydrogen is performed using shear coaxial injectors. The hydrodynamic instabilities formed by the coaxial shear injector allows the mixing between the propellants through vorticity created by the instability of the shear layers. This work investigates the stability characteristics of axisymmetric coaxial jets composed of hydrogen and oxygen using both linear stability theory (LST) and high order simulations (HOS). The LST has shown that the cases where the hydrogen was used as species in the inner jet H2−O2 the amplification rates of Mode II are larger than the homogeneous coaxial jet, contrarily to what happens in O2−H2 configuration. However For Mode I, the binary mixing layer results can not be extrapolated for a coaxial binary jet, once the confinement effect, caused by the finite quantity of species that can be placed in the inner jet, plays an important role. The HOS simulations were performed to investigate the effect of nonlinearity and realistic velocity and density profiles. It also shows the flow topology development.

Keywords

Binary coaxial jets, hydrodynamic stability, Euler equation, high-order numerical simulation

 

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