关键词: 亚声速进气道;流动特性;分离流

Abstract: low characteristics in a large s-bend rectangular diffuser are analysed and compared under four through incoming flow conditions flow visulization on the walls of the diffuser, distribution plots of total pressure recovery, plots of velocity vector and distribution of static pressure recovery along the walls. As indicated in experiments, the flow characteristics are influnced greatly by incoming flow conditions, of which the incoming flow condition with uniform core velocity represents the common characteristics of the large s-ben4 diffuser, such as highest average total pressure recovery, smaller circumferential total pressure distortion and weaker secondary flow. The investigation under static condition on flow characteristics in the large S-bend rectangar diffuser with side inlet is more pratically significante. Test results show lower exit average total pressure recovery, larger circumferential total pressure distortion and stronger and more irregular secondary flow.

Key words: ubsonic inlet;Flow characteristic;Separated flow