Measurements of laminar burning velocity and analysis of its field for the laminar premixed methane-air flames using the Bunsen burner method and schlieren technique
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摘要: 层流燃烧速度是确定燃烧传播模型和验证化学反应机理的关键参数。搭建了本生灯实验系统和纹影实验系统用于探究甲烷预混层流燃烧特性，通过本生灯法和纹影技术测得了甲烷/氮气/空气的层流燃烧速度和火焰外部流场，并且探究了当量比及氮气掺混对层流燃烧速度和火焰外部流场的影响。研究发现，当量比对甲烷层流预混火焰燃烧特性有着重要的影响，随着当量比的增加，层流燃烧速度先增大后减小，锥形火焰高度先减小后增加，火焰外部流场开始逐渐趋于稳定；氮气掺混对层流燃烧速度起着降低的作用，且掺混的氮气越多，层流燃烧速度降低幅度越大；掺混氮气后火焰高度增加，但是火焰外部流场变得更加紊乱，难以稳定。Abstract: The laminar burning velocity is a key parameter for determining the combustion propagation model and verifying the chemical reaction mechanism. In this paper, the Bunsen burner experiment system and the schlieren experiment system are built to carry out research on the laminar premixed combustion characteristics of methane. The laminar burning velocity and the flame external field of methane/nitrogen/air were measured by the Bunsen burner method and the schlieren technique respectively, and the effects of equivalence ratio (ER) and nitrogen blending on the laminar burning velocity and the external field of the flame were investigated. The following conclusions are obtained through experiments: the equivalence ratio has an important influence on the laminar premixed combustion characteristics of the methane; and as the equivalence ratio increases, the laminar burning velocity increases first and then decreases, and the cone flame height decreases first and then increases; as well the external field of the flame starts to stabilize gradually. Nitrogen blending plays a negative role in the laminar burning velocity variation, at the same fime, the more nitrogen is blended, the more the laminar burning velocity decreases. The flame height increases with the increase of N2 doping ratio, but the external flow field of the flame becomes more disordered and difficult to stabilize.
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图 7 纹影图中火焰位置和外部流场位置
Figure 7. Flame position and external flow field position in the schlieren
图 8 甲烷流量为280 mL/min时，不同当量比下的层流预混火焰纹影
Figure 8. Laminar premixed flame schlieren photographs at different equivalence ratios with the methane flow rate of 280 mL/min
图 9 甲烷流量为280 mL/min时，不同当量比下的层流预混火焰纹影
Figure 9. Laminar premixed flame schlieren photographs at different equivalence ratios with the methane flow rate of 280 mL/min
图 10 甲烷掺混20%氮气、当量比为1.00~1.40时，甲烷/氮气/空气层流预混火焰外部流场纹影
Figure 10. Methane/N2/Air laminar premixed flame external field photograph with blending 20% N2 at Φ=1.10~1.40
图 11 甲烷掺混40%氮气、当量比为1.00~1.30时，甲烷/氮气/空气层流预混火焰外部流场纹影
Figure 11. Methan/N2/Air laminar premixed flame external field photograph with blending 40% N2 at Φ=1.00~1.30
表 1 甲烷/空气层流预混火焰实验工况
Table 1. Experimental data for CH4/Air laminar premixed flame
当量比
Φ甲烷流量
/(mL·min-1)氧气流量
/(mL·min-1)空气流量
/(mL·min-1)0.90 280 622.22 2962.96 0.95 280 589.47 2807.02 1.00 280 560.00 2666.67 1.05 280 533.33 2953.68 1.10 280 509.09 2424.24 1.15 280 486.96 2318.84 1.20 280 466.67 2222.22 1.25 280 448.00 2133.33 1.30 280 430.77 2051.28 1.35 280 414.81 1975.31 1.40 280 400.00 1904.76 1.45 280 386.21 1839.01 1.50 280 666.67 1777.78 1.55 280 361.29 1720.43 1.60 280 350.00 1666.67 
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表 2 甲烷流量为260 mL/min、掺混20%氮气时实验工况
Table 2. Experimental data for methane of 260 mL/min with 20% N2 blending
当量比
Φ甲烷流量
/(mL·min-1)氧气流量
/(mL·min-1)空气流量
/(mL·min-1)掺混氮气流量
/(mL·min-1)总氮气流量
/(mL·min-1)1.00 260 520.00 2476.19 65 2021.19 1.05 260 495.24 2358.28 65 1928.04 1.10 260 472.73 2251.08 65 1843.35 1.15 260 452.17 2153.21 65 1766.04 1.20 260 433.33 2063.49 65 1695.16 1.25 260 416.00 1980.95 65 1629.95 1.30 260 400.00 1904.76 65 1569.76 1.35 260 385.19 1834.22 65 1514.03 1.40 260 371.43 1768.21 65 1462.28
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表 3 甲烷流量为260 mL/min、掺混40%氮气时实验工况
Table 3. Experimental data for methane of 260 mL/min with 40% N2 blending
当量比
Φ甲烷流量
/(mL·min-1)氧气流量
/(mL·min-1)空气流量
/(mL·min-1)掺混氮气流量
/(mL·min-1)总氮气流量
/(mL·min-1)1.00 260 520.00 2476.19 173.33 2129.53 1.05 260 495.24 2358.28 173.33 2036.37 1.10 260 472.73 2251.08 173.33 1951.69 1.15 260 452.17 2153.21 173.33 1874.37 1.20 260 433.33 2063.49 173.33 1803.49 1.25 260 416.00 1980.95 173.33 1738.29 1.30 260 400.00 1904.76 173.33 1678.10 1.35 260 385.19 1834.22 173.33 1622.36 1.40 260 371.43 1768.21 173.33 1570.61
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