旋流器是旋流微燃烧室的关键部件。旋流器叶片影响进入燃烧器通道的混合气体的流动并改变燃烧器的燃烧特性。研究并比较了不同进气速度、当量比和壁材料下叶片角度对直叶片 (SCSV) 或扭曲叶片 (SCTV) 旋流微燃烧器燃烧特性的影响。结果表明，增加叶片角度扩大了SCSV的角回流区（CRZ）和SCTV的内回流区（IRZ）。再循环区的扩大通过在高入口速度下固定火焰来提高燃烧稳定性。叶片角度对壁温的影响对于 SCSV 和 SCTV 是不同的。当入口速度为 40 m/s 时，当叶片角度从 15° 增加到 75° 时，SCSV 的平均外壁温度升高 47 K，SCTV 的平均外壁温度下降 30 K。在以SiC为壁材的SCTV中，大叶片角提高了预热效果，传给混合气的热量（Qpre ) 在叶片角度为 75° 时比 15° 大 13.6%。在高入口速度下，旋流器的叶片角对燃烧效率和压力损失有显着影响。当进气速度为40 m/s时，SCSV在15°、30°、75°叶片角下的燃烧效率和全压损失系数分别为97%和1.9%、97.7%和2.8%、97.3%和8.3% ， 分别。
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Effect of vane angle on combustion characteristics of premixed H2/air in swirl micro-combustors with straight vane or twisted vane
The swirler is a key part of the swirl micro-combustor. The swirler vanes affect the flow of the mixture gas entering the combustor channel and change the combustion characteristics of the combustor. The effect of the vane angle on the combustion characteristics in swirl micro-combustors with straight vane (SCSV) or twisted vane (SCTV) was investigated and compared under different inlet velocities, equivalence ratios, and wall materials. The results show that increasing the vane angle expands the corner recirculation zone (CRZ) of SCSV and the inner recirculation zone (IRZ) of SCTV. The expansion of recirculation zone improves the combustion stability by anchoring the flame at high inlet velocities. The effect of vane angle on the wall temperature is different for SCSV and SCTV. When the inlet velocity is 40 m/s, the mean outer wall temperature rises by 47 K in SCSV and drops by 30 K in SCTV as the vane angle increases from 15° to 75°. In SCTV with SiC as the wall material, the large vane angle improves the preheating effect, and the heat transferred to the mixture gas (Qpre) is greater by 13.6% at a vane angle of 75° compared to 15°. At high inlet velocities, the vane angle of the swirler has a significant effect on the combustion efficiency and pressure loss. When the inlet velocity is 40 m/s, the combustion efficiency and total pressure loss coefficient of SCSV are 97% and 1.9%, 97.7% and 2.8%, 97.3% and 8.3% at vane angles of 15°, 30°, 75°, respectively.