Low temperature combustion (LTC) is a potential thermodynamic pathway to maximize the thermal efficiency of internal combustion (IC) engines. However, high exergy loss is also observed within this combustion concept. The present study focuses on the homogeneous combustion process and examines the detailed exergy destruction mechanisms under representative LTC engine conditions. By varying both equivalence ratios (φ) and temperatures (T) at initial pressure of 50 bar, it is found that the decreased total exergy destruction fraction (f_ED) with increasing initial temperature mainly results from the decreased exergy destruction in the high temperature heat release stage, while using rich mixture can significantly reduce the f_ED in the ignition delay stage, which is dominated by the reactions involving large molecules (C7 species). Reaction pathway analysis reveals that the detailed exergy destruction sources are significantly affected by the reaction pathways. Furthermore, a qualitative exergy loss φ-T map was created to illustrate the exergy loss reduction potential. It is concluded that the combustion pathway that reforming the rich fuel/air mixtures before ignition followed by the low temperature combustion of lean reforming products offers the potential to simultaneously reduce exergy destruction and avoid soot and NOx formation. However, the potential advantages of this exergy reduction combustion concept still require further work.

低温燃烧（LTC）是潜在的热力学途径，可最大限度地提高内燃机（IC）的热效率。然而，在该燃烧概念内也观察到高的火用损失。本研究着重于均质燃烧过程，并研究了具有代表性的LTC发动机工况下的详细火用破坏机理。通过改变初始压力为50 bar时的当量比（φ）和温度（T），可以发现，随着初始温度的升高，总的总火用破坏率（f _ED）降低，这主要是由于高温热导致的火用破坏减少了。释放阶段，同时使用丰富的混合物可以显着降低f_ED处于点火延迟阶段，主要由涉及大分子（C7物种）的反应主导。反应途径分析表明，详细的火用破坏源受到反应途径的显着影响。此外，创建了定性的火用损失φ - T图，以说明减少了火用损失。可以得出结论，在燃烧通道点火随后的稀重整产品提供低温燃烧以同时减少有效能的破坏，并避免烟灰和NO的电位之前重整富燃料/空气混合物X形成。然而，这种减少火用燃烧概念的潜在优点仍然需要进一步的工作。