To analyze of flow characteristics of the pylon before/after injection in supersonic combustion

the numerical simulation was carried out to investigate the effect rules of pylon on ethylene injection cold flow field.The influence of several conditions on flow field was contrastive analyzed

such as: with and without pylon

different injection locations and different injection angles. It is found that the streamwise vortex zone and low pressure depression behind the pylon are the paramount mechanism for mixing enhancement. Further distance between the pylon and injector is good for mixing enhancement for stronger wise vortex zone

but leads to higher total pressure loss for less low pressure depression. Moreover

injection with the distance between pylon and injector of 2.2d

injection angle of 90 degree is recommended regarding high mixing efficiency and less total pressure loss.