Performance of a micro-mixing single-injector under H2O(g)/CO2/N2 dilution for methane-oxygen combustion
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摘要:
基于搭建的过热水蒸气（200 ℃）发生系统以及轴切型微混喷嘴，在水蒸气稀释条件下开展了甲烷纯氧微混燃烧实验研究。研究发现，随着水蒸气（H2O（g））稀释流量的增加和氧浓度的减小，火焰结构经历附着于喷嘴内部、附着于喷嘴出口、抬升火焰、被吹熄4个过程，同时当量比的增加提高了火焰抗吹熄能力；进一步对比研究了H2O（g）/CO2/N2稀释时在不同当量比下的火焰稳定性，发现H2O（g）稀释下的火焰相比于CO2稀释表现出更好的稳定性；温度测量结果表明：H2O（g）稀释下的火焰温度最高；此外，通过PIV技术对石英管内冷流流场进行了分析，结果表明石英管内存在明显的回流区，同时在喷嘴出口上方20 mm处存在轴向速度的极小值点，这一现象有助于增强火焰稳定性和抗吹熄能力。
Abstract:In response to the future development needs for efficient, advanced, zero-emission gas turbines, a system for generating superheated water vapor (200 ℃) was established and an axial-tangential micro-mixing swirl nozzle was designed to conduct experiments on pure oxygen combustion under conditions of water vapor dilution in this study. The results showed that as the flow rate of water vapor (H2O(g)) dilution increased, the concentration of oxygen decreased, leading to four distinct flame structure processes: attached to the inside of the nozzle, attached to the outlet of the nozzle, flame lifting, and blowout occurrence. Moreover, an increase in flame resistance against blowout with higher equivalent ratios was observed. Subsequently, flame stability with H2O(g)CO2/N2 dilution at different equivalent ratios was investigated, finding that H2O(g) dilution exhibited better stability compared with CO2 dilution. Furthermore, flame temperatures under three diluted gases were measured, finding that water vapor (H2O(g)) dilution yielded the highest temperature. Finally, through PIV analysis of the cold flow field within a glass tube, a prominent reflow area on its exterior was identified, and the distribution of axial velocity demonstrated a minimum point 20 mm above the nozzle exit, which enhanced flame stability and improved resistance against blow-out.
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图 3 水蒸气稀释条件下的燃烧稳定性相图
Figure 3. Phase diagram of flame stability under water vapor dilution
图 5 不同稀释气体稀释下的火焰层流燃烧速度（φ=0.8）
Figure 5. Flame laminar velocity under different dilution gases （φ=0.8）
图 7 不同当量比下的转变氧浓度
Figure 7. Transition oxygen concentrations at different equivalent ratios
图 10 不同轴向位置处管内温度径向分布（φ=0.8，β=0.45）
Figure 10. Radial distribution of in-tube temperature at different coaxial locations （φ=0.8，β=0.45）
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