Numerical study on the breakup and atomization characteristics of crossflow under time-varying flow conditions
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摘要:
针对涡轮基组合循环发动机加力/冲压燃烧室模态转化过程中进口气流随时间剧烈变化的问题,以横向射流为研究对象,在来流温度300~800 K、来流速度100~164 m/s和来流加速度20~100 m/s2条件下,采用雷诺平均/离散相模型相结合的方法探讨了来流加速度对横向射流外轨迹以及索太尔平均直径(SMD)分布的影响,采用大涡模拟/流体体积法相结合的方法探讨了来流加速度对横向射流燃油雾化过程的影响。结果表明:来流加速度对横向射流外轨迹和下游SMD分布几乎没有影响;来流加速度可能引起射流液柱破碎点延后、反向对转涡沿喷射方向分布变宽且沿展向在边缘处强度减弱,但影响并不显著;时变来流对于燃油破碎及雾化特性无明显影响。
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关键词:
- 时变来流 /
- 流体体积(VOF)模型 /
- 液雾分布轨迹 /
- 索太尔平均直径(SMD)分布 /
- 破碎点
Abstract: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.
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表 1 模拟工况表
Table 1. Simulation case table
工况 来流温度T/K 来流加速度a/(m/s2) 目标来流速度Vair,t/(m/s) 燃油速度Uj/(m/s) 目标液气动量比qt Case A0~A3 300 0,20,50,100 100 20 27 Case B0~B3 500 0,20,50,100 128.77 20 27 Case C0~C3 700 0,20,50,100 153.45 20 27 Case D0~D3 800 0,20,50,100 163.58 20 27 Case E0 300 0 120 20 18 Case F0 300 0 140 20 14 -
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