摘要
提出采用多孔介质材料制作火焰稳定器,利用其通透和弥散性能改善钝体后燃空比,降低钝体引起的压力损失,提高火焰稳定性.通过实心钝体、10和40PPI(pores perinch)多孔介质钝体火焰稳定特性和冷态尾迹测量对比实验发现:多孔介质火焰稳定器可获得更宽的火焰稳定范围;相同燃料和空气伴流条件下,多孔介质钝体后火焰刚性更强,燃烧更充分;实心钝体回流区较靠近钝体,回流区强度较强;多孔介质钝体回流区向下游发展,回流区强度较弱,但空气燃料混合更好.因此多孔介质稳定器关键是要确定合适的孔径,使火焰更稳定燃烧。
Porous media were investigated for the preparation of flame holders,for porous media＇s permeability and dispersivity can bring down pressure loss and improve the ratio of fuel and air after the bluff-bodies.Based on the comparative trials of a solid bluff-body and another two with 10PPI（pores per inch） and 40PPI,respectively,it was found that the porous media flame holder can have a wider range of flame stability.Under the same fuel and air co-flow conditions,a porous medium makes burning more complete,and the flame more rigid.The recirculation zone of a solid bluff-body is closer to the bluff-body and the back flow intensity is stronger than that of a body made of porous media.Hence,considering the pressure loss and the effects of fuel and air mixing,an appropriate diameter of porous media is the key to stabilizing flames.
基金
国家自然科学重点基金(50936005)资助
