An experimental study was conducted using outwardly propagating flame to evaluate the laminar burning velocity and flame intrinsic instability of diluted H₂/CO/air mixtures. The laminar burning velocity of H₂/CO/air mixtures diluted with CO₂ and N₂ was measured at lean equivalence ratios with different dilution fractions and hydrogen fractions at 0.1 MPa; two fitting formulas are proposed to express the laminar burning velocity in our experimental scope. The flame instability was evaluated for diluted H₂/CO/air mixtures under different hydrogen fractions at 0.3 MPa and room temperature. As the H₂ fraction in H₂/CO mixtures was more than 50%, the flame became more unstable with the decrease in equivalence ratio; however, the flame became more stable with the decrease in equivalence ratio when the hydrogen fraction was low. The flame instability of 70%H₂/30%CO premixed flames hardly changed with increasing dilution fraction. However, the flames became more stable with increasing dilution fraction for 30%H₂/70%CO premixed flames. The variation in cellular instability was analyzed, and the effects of hydrogen fraction, equivalence ratio, and dilution fraction on diffusive-thermal and hydrodynamic instabilities were discussed.

使用向外传播的火焰进行了实验研究，以评估稀释的H ₂ / CO /空气混合物的层流燃烧速度和火焰固有不稳定性。燃烧h的速度的层₂与CO稀释/ CO /空气混合物₂和N ₂混合物在0.1兆帕不同稀释馏分和氢气贫馏分当量比测量; 在实验范围内，提出了两个拟合公式来表示层流燃烧速度。在0.3 MPa和室温下，在不同氢气分数下，对稀释的H ₂ / CO /空气混合物的火焰不稳定性进行了评估。作为H ₂ H中分数₂/ CO混合气含量超过50％，当当量比降低，火焰变得更加不稳定；但是，当氢含量低时，当量比降低，火焰变得更稳定。70％H ₂ /30％CO预混火焰的火焰不稳定性几乎不会随着稀释分数的增加而改变。但是，对于30％H ₂ /70％CO预混火焰，随着稀释比例的增加，火焰变得更加稳定。分析了细胞不稳定性的变化，并讨论了氢分数，当量比和稀释分数对扩散热和流体动力学不稳定性的影响。