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中文摘要：
采用大涡模拟方法（LES）模拟了悉尼旋流燃烧器的中等旋流数算例（N29S054和N29S045）的冷态流场，研究了涡旋破碎泡（下游二次回流区）的不稳定模式．LES结果得到的统计矩总体上与实验值符合得较好．研究发现：涡旋破碎泡没有螺旋形结构，其周围也没有出现螺旋形状的进动涡核，表明涡旋破碎泡没有典型的进动特征；瞬时速度分布显示了涡旋破碎泡存在着周期性的收缩／崩塌与膨胀的现象；功率谱的特征峰证实了涡旋破碎泡存在着周期性运动．
英文摘要：
Large eddy simulation （LES） was applied to the non-reactive cases with medium swirl numbers （N29S054 and N29S045） of the Sydney swirl burner, and the instability mode of the vortex breakdown bubble （the downstream second recirculation zone） was investigated. The statistical moment obtained from LES results shows good overall agreement with experimental data. The vortex breakdown bubble （VBB） did not exhibit the spiral-type, and was not surrounded by the spiral precessing vortex core （PVC）, which indicates that the VBB shows no distinct precession motion. The instantaneous velocity contours suggest the existence of cyclic collapse/contraction and expansion of VBB. The distinct peak of power spectrum density gives further evidence for periodic motion.
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