张克松，乔 意

（山东交通学院，山东 济南  250357）

    摘要：本文以正庚烷和菲作为代表物质，组成理论空燃比和自燃特性与普通柴油较为接近的表征燃料，开发了较为精简的,包含26种组分，30个反应的柴油燃烧简化机理。在此基础上，针对某型轻型车用柴油机开展研究，通过CFD耦合反应机理技术对其燃烧过程进行了数值模拟，并与台架试验测量结果对比验证。计算得到的燃烧始点、燃烧相位、最高压力等均与实测数据符合得较好。对于1800rpm的工况，其对改变喷油提前角控制燃烧过程的预测体现出很高的精度。研究还发现，对于因扩散燃烧造成的两阶段放热现象，需要使用更精细的网格进行燃烧的数值模拟。

    关键词：轻型柴油机；燃烧模拟；简化机理

    Abstract: N-heptane and phenanthrene were chosen as surrogates to form a reference fuel which is similar to diesel with similar stoichiometric ratio and self-ignition characteristics. A reduced oxidation mechanism contains 26 species and 30 reactions was developed. Numerical investigation of a light-duty diesel combustion by CFD coupling with oxidation mechanism was carried out and validated by experimental tests. It is shown that the calculated combustion phase and maximum in cylinder pressure had good agreement with the experimental data, especially for injection timing scanning when engine speed was maintained at 1800rpm. Meanwhile, a greater refinement of meshing was necessary for two-stage heat release of diffusion combustion.

    Keyword: Light-Duty Diesel; Combustion Simulation; Reduced Mechanism