Numerical study on the breakup and atomization characteristics of crossflow under time-varying flow conditions
In view of the problem that the inlet flow changes dramatically with time during the modal transformation of afterburner/ramjet of turbo-based combined cycle engine,the transverse jet was taken as the research object.Under the conditions of inlet temperature of 300-800 K,inlet velocity of 100-164 m/s and inlet acceleration of 20-100 m/s2,the Reynolds mean/discrete phase model was used to discuss the influence of the inlet acceleration on the lateral jet trajectory and Sauter mean diameter(SMD)distribution.The large eddy simulation/fluid volume method was used to discuss the influence of the inlet acceleration on the lateral jet fuel atomization process.The results showed that the inflow acceleration had little effect on the lateral jet trajectory and downstream SMD distribution.The acceleration of the inlet flow may cause the delayed and reverse vortex to be more widely distributed along the jet direction,but the intensity weakened at the edge along the spanwise direction.But the effect was not significant;the time-varying incoming flow had no obvious effect on the fuel crushing and atomization characteristics.
time-varying flowvolume of fluid(VOF)modeltrajectory of the spray distributiondistribution of Sauter mean diameter(SMD)breakup point
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