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Date of Publication:2022-10-07

Journal:热科学与技术

Affiliation of Author(s):能源与动力学院

Volume:14

Issue:5

Page Number:409-417

ISSN No.:1671-8097

Abstract:Large eddy simulations of injection and atomization of n-heptane under
   supercritical conditions were performed using commercial CFD software
   CONVERGE.The predictions were compared to experimental data provided by
   Sandia National Laboratories.Based on two cubic equations of
   state,i,e,SRK and PR equations,the effect of equations of state on
   dynamics of fuel spray,fuel jet density,the variation of mass fraction
   of fuel spray with temperature was studied and compared with
   experimental data.The simulated results show that the fuel spray
   penetration predicted by the SRK equation is deeper,and there exits a
   significant density gradient on the jet flow interface for both
   equations.The predictions agree well with the experimental results,but
   the PR equation behaves better than the SRK equation under supercritical
   conditions.The variation of mass fraction of fuel spray with temperature
   is well predicted.The sharp change in density verifies that the jet flow
   interface is a mixing layer between the liquid and its surrounding
   supercritical fluid.The density gradient can be used to identify the
   mixed layer position.

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