Unsteady flow and the mixing efficiency in transverse jets

Author

Liu, Hui ; Xing, Yuming

Author_Institution

Beijing Univ. of Aeronaut. & Astronaut., Beijing, China

fYear

2011

fDate

16-18 April 2011

Firstpage

4608

Lastpage

4611

Abstract

A numerical method is used to compute the unsteady transverse jets flow and study the air-fuel mixing characteristics in the unsteady flowfield. The unsteady compressible Navier-Stokes equations are solved using a high-order AUSM+ method with dual-time-step implicit time scheme. It is found that the transverse jets flowfield is very unsteady and the unsteadiness is caused by the primary vortices emanating from the jet nozzle. Detained analysis of the instantaneous flow and mass fractions of species are performed, showing that the location of primary vortices significantly affects the mixing efficiency, and the mass fractions of species and mixing efficiency show unsteady and oscillatory with time.

Keywords

Navier-Stokes equations; flow simulation; jets; mixing; nozzles; numerical analysis; turbulence; vortices; air-fuel mixing characteristics; dual-time-step implicit time scheme; high-order AUSM+ method; instantaneous flow; jet nozzle; mass fractions; mixing efficiency; numerical method; primary vortex location; transverse jet flowfield; unsteadiness; unsteady compressible Navier-Stokes equations; unsteady flowfield; unsteady transverse jet flow; Atmospheric modeling; Computational modeling; Equations; Fuels; Heating; Mathematical model; Viscosity; mixing efficiency; numerical simulation; transverse jet; turbulence mixing; unsteady flow;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics, Communications and Networks (CECNet), 2011 International Conference on

Conference_Location

XianNing

Print_ISBN

978-1-61284-458-9

Type

conf

DOI

10.1109/CECNET.2011.5769062

Filename

5769062