Numerical analysis of turbulent flow dynamics and heat transport in a round jet at supercritical conditions

摘要

Using a direct numerical simulation (DNS), a round jet of cryogenic nitrogen, which mimics the experiment by Mayer et. al. (2003) in terms of geometry, thermodynamics, and hydrodynamics, but at reduced Reynolds-Number (Re = 5300 based on the injection diameter), is investigated. The objectives of the present paper are: (1) to reliably predict the turbulence statistics in order to investigate the physical mechanisms, that dominate the flow dynamics, and to investigate the fuel disintegration and mixture formation, (2) to analyze the characteristics of heat transport phenomena of supercritical flows in order to determine parameter regimes advantageous to mixing, and (3) to provide a database for model development and validation that is difficult to obtain experimentally at such extreme thermodynamic conditions.