折叠V形火焰稳定器原型的冷态与稳燃特性研究

In order to obtain the cold flow and combustion characteristics of a new proto type flame holder called folded V bluff body, the cold flow experiments and combustion numerical simulation of 10 groups of folded V bluff body flame holders with different folding angles were carried out by wind tunnel experiments and Hybrid RANS/LES simulation. The cold flow experimental wind speed is 10~50m/s with Re number range of 1×10⁴ to 8×10⁴. And the combustion numerical simulation conditions are: intake temperature 700K, inflow speed 50~150m/s, Re number range from 2×10⁴ to 6×10⁴, equivalent ratio 0.2~1. The total pressure recovery coefficient of folded V bluff bodies with variable folding angles was measured by experiments. The drag coefficient, blowing out performance and combustion efficiency of folded-V bluff body were further obtained by numerical simulation, and the flame shape downstream were analyzed in detail. The results show that the total pressure recovery coefficient and drag coefficient of each folded V bluff bodies are better than those of the standard V bluff body. The total pressure recovery coefficient increases with the decrease of the folding angle, while the drag coefficient decreases. The blow out performance and combustion efficiency of the folded V bluff body are better than those of the standard V bluff body. The downstream flame diffusion characteristics of the folded V- bluff body are significantly different from those of the standard V bluff body.