Experimental data and detailed numerical modelling are presented on the burning characteristics of a model gasoline/biofuel mixture consisting of n-heptane and iso-butanol. A droplet burning in an environment that minimises the influence of buoyant and forced convective flows in the standard atmosphere is used to promote one-dimensional gas transport to facilitate numerical modelling of the droplet burning process. The numerical model includes a detailed combustion kinetic mechanism, unsteady gas and liquid transport, multicomponent diffusion inside the droplet, variable properties, and non-luminous radiative heat transfer from the flame. The numerical simulation was validated by experimental measurements in the standard atmosphere which showed good agreement with the evolutions of droplet and flame diameters. The iso-butanol concentration had a strong effect on formation of particulates. Above ~20% (volume) iso-butanol, flame luminosity was significantly diminished anddecreased with increasing iso-butanol concentration, while CO₂ emissions as a representative greenhouse gas were not strongly influenced by the iso-butanol loading. The soot shell was located near a 1350 K isotherm for concentrations up to 20% (volume) iso-butanol, suggesting this value as a possible soot inception temperature for the mixture droplet. The combustion rate decreased with increasing iso-butanol concentration which was attributed to iso-butanol's higher liquid density. No evidence of a low temperature burning regime, or of extinction, was found (in experiments and simulations) for the small droplet sizes investigated.

给出了由正庚烷和异丁醇组成的模型汽油/生物燃料混合物的燃烧特性的实验数据和详细的数值模型。在使标准大气中的浮力和强迫对流最小化的环境中燃烧液滴可用于促进一维气体传输，以促进液滴燃烧过程的数值模拟。数值模型包括详细的燃烧动力学机制，不稳定的气体和液体传输，液滴内部的多组分扩散，可变的特性以及来自火焰的非发光辐射热传递。通过在标准大气中的实验测量对数值模拟进行了验证，该实验表明与液滴和火焰直径的变化具有良好的一致性。异丁醇的浓度对颗粒的形成有很强的影响。异丁醇含量超过约20％（体积）时，随着异丁醇浓度的增加，火焰的光度显着降低并降低。作为代表性温室气体的₂排放量不受异丁醇负载的强烈影响。烟灰壳位于1350 K等温线附近，浓度高达20％（体积）的异丁醇，表明该值是混合物液滴可能的烟灰起始温度。燃烧速率随异丁醇浓度的增加而降低，这归因于异丁醇的较高液体密度。对于所研究的小液滴尺寸，在实验和模拟中均未发现低温燃烧或熄灭的证据。