等离子体助燃是一项能有效缩短点火延迟时间、提高燃烧效率和燃烧稳定性的新技术,可应用于航空发动机和汽车内燃机.为研究非平衡等离子体对丙烷燃烧的强化作用,建立了化学动力学模型,计算分析了非平衡等离子体中所含活性组分对丙烷燃烧的点火延迟时间和层流火焰传播速度的影响.计算结果表明:在丙烷/氧气/氩气预混气体中加入活性粒子(O、OH、NO)和自由基(CH2、CH3),混合气体的点火延迟时间减小2～3个量级,加入1％NO后,燃烧过程中活性中间体(O、OH、CH、CH2、CH3)的摩尔浓度会明显增加；化学当量比φ=0.8～1.0范围内的丙烷/空气预混气体燃烧时,加入自由基CH或CH3能增强层流火焰传播速度,在φ=0.8～1.2范围内,加入1％的活性粒子O、OH,火焰传播速度明显提高.%Plasma-enhanced combustion is an innovative technology for decreasing the ignition delay time, enhancing combustion efficiency and stability of combustors such as aircraft engines and internal combustion engines. In this paper, the chemical kinetic model is established to study the enhancement of the non-equilibrium plasma on propane combustion, the influence of active components in the non-equilibrium plasma on the propane combustion is calculated and analyzed. The calculative results of the model show that the ignition delay time of premixed propane-oxygen diluted with argon can be reduced 2-3 orders by adding active species (O, OH, NO) and free radicals (CH2, CH3). The mole concentrations of active intermediates in the combustion, such as O, OH, CH, CH2, CH3, are increased by adding 1 % NO. Additive free radicals CH or CH3 can increase the lean premixed propane/air laminar flow flame propagation speed with for the equivalence ratio ψ=0. 8-1. 0, the flame propagation speed is increased by accession 1% active species O or OH on the equivalence ratio ψ = 0.8-1.2.
展开▼
