Abstract
The PIV and PLIF OH techniques were used to experimentally study the structure of a jet impinging on a flat obstacle with swirling and combustion of a propane–air mixture with an equivalence ratio of 0.7 for a nozzle–obstacle distance H/d = 1 and 3 and in the absence of the obstacle. The swirl ratio was 0.41 and 1.0, and the Reynolds number was 5 000. It is concluded that for both values of the swirl ratio, the presence of the impact surface leads to the formation of an extended central cone-shaped recirculation zones. For H/d = 3 and 2, the OH fluorescence intensity near the impact surface and inside the recirculation zone is significantly reduced. This effect may be caused by a decrease in the temperature of combustion products in the recirculation zone, including in the vicinity of the flame front.
Original language | English |
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Pages (from-to) | 131-136 |
Number of pages | 6 |
Journal | Combustion, Explosion and Shock Waves |
Volume | 56 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Mar 2020 |
Keywords
- impact jet
- near-wall combustion
- swirling jet
- vortex combustion