摘要
运用超大涡模拟(VLES)方法对燃烧室冷态流场开展了数值模拟,研究流场中大尺度涡旋结构.选取圆管内有旋流动为基准算例开展数值模拟研究,与实验结果的比较验证了VLES方法的精度.计算结果表明,燃烧室内回流区形状合理.燃烧室中大孔射流与横向来流的相互作用形成了反向旋转涡对结构,Rothstein提出的射流迹线公式能够合理预测主燃孔的射流穿透.进动涡核(PVC)发源于燃烧室头部旋流器装置内部,基于功率谱密度预测了PVC引发流场振荡的特征频率.
Very large eddy simulation(VLES)was performed to study non-reacting flow fields in a combustor.Large scale vortex structures were investigated in the flow fields.A benchmark case for turbulent swirling flow in circular tube was studied by numerical simulation.The accuracy of VLES method was verified by a comparison with experimental data.The simulation results show that the shape of the recirculation zone in the combustor is reasonable.The counter-rotating vortex pairs are generated by the interaction between a large hole jet and a crossflow in the combustor.The jet trajectory formula given by Rothstein can reasonably predict the jet penetration of the main combustion hole.The precessing vortex core(PVC)originates from the combustor head swirler.The power spectral density was employed to predict the characteristic frequency of flow oscillation induced by PVC.
作者
张宏达
万斌
张成凯
林宏军
尚守堂
韩省思
叶桃红
ZHANG Hongda;WAN Bin;ZHANG Chengkai;LIN Hongjun;SHANG Shoutang;HAN Xingsi;YE Taohong(AECC Shenyang Engine Research Institute, Shenyang 110015, China;College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China)
基金
国家自然科学基金(91641205,51606095)资助.
关键词
燃烧室
超大涡模拟
旋流
反向旋转涡对
进动涡核
combustor
very large eddy simulation(VLES)
swirling flow
counter-rotating vortex pairs
precessing vortex core(PVC)
