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EFFECTS OF HEAT RELEASE ON TURBULENT JET FLOWS

Matthias Ihme
Department of Mechanical Engineering Stanford University Stanford, CA 94305, USA

Heinz Pitsch
Center for Turbulence Research Stanford University Stanford, CA

Abstract

Large-eddy simulations of isothermal and reactive turbulent round jets at a jet Reynolds number of 14,720 have been performed to study the effects of heat release on jet dynamics and entrainment. Results for flow field statistics from the simulations are in good agreement with available experimental data. Effects of buoyancy and temperature-dependent molecular properties on the instantaneous flow field and statistical flow field quantities are investigated in separate numerical simulations. Mass flux and jet entrainment rates have been computed from the simulations. It is shown that the fluctuating mass flux, which is difficult to determine experimentally, amounts to as much as 15% of the total mass flux.