Abstract: The numerical simulation has been carried out to investigate the effects of the rear blunt body with different open angle and slot size on the advanced vortex combustor(AVC).The results show that AVC has better flow characteristics when there is a slot in the rear blunt body. By selecting the appropriate open angle and slot size to optimize the open structure of the rear blunt body in advanced vortex combustor，stable combustion with lower pressure drop can be achieved. This new structure combustor can improve the cavity temperature effectively and make temperature distribution more uniform. For the rear blunt body of AVC structure，when half open angle θ is 50° and slot size is 2mm，AVC can achieve the best performance.

Key words: Advanced vortex combustor; Rear blunt body; Vortex; Turbulence; Numerical simulation

摘要： 为了研究不同后钝体开口结构对先进旋涡燃烧室(AVC)流场的影响，分别对不同开口角度和开口尺寸的AVC流场进行了数值模拟。结果表明，后钝体开口比不开口有明显的优势，可通过选择合适的后钝体开口角度和开口尺寸来优化AVC，实现低压降的稳定燃烧。后钝体开口结构AVC可有效提高凹腔温度并使温度分布更加均匀。对于本文AVC结构的后钝体，半开口角度 θ 为50°，开口尺寸为2mm时，AVC综合性能最佳。

关键词: 先进旋涡燃烧室；后钝体； 旋涡；湍流；数值模拟