柴油机燃烧室的几何形状对缸内燃油的雾化和燃烧有着直接影响。为满足日益严格的排放法规，以某柴油机为研究对象，使用AVL Fire软件在保证相同压缩比的前提下，对原型ω燃烧室几何形状进行改造，引入环形凸起结构和中心凸台结构构造TCD（T表示涡轮增压，Turbocharger；C表示进气中冷，Charger air cooling；D表示柴油颗粒捕集器，Diesel particle filter）燃烧室，并对TCD燃烧室的结构参数进行优化。使用仿真模拟的方法，研究了不同几何形状的燃烧室对柴油机性能及排放的影响。研究结果表明：TCD燃烧室的燃烧性能主要受燃烧室直径的影响，直径过大或过小均会降低指示功率；TCD燃烧室优化后指示功率相对于优化前增加了0.98%，相对于原型ω燃烧室增加了8.26%； TCD燃烧室优化后Soot排放量相对于优化前降低了67.19%，相对于原型ω燃烧室降低了88.37%。

The combustion chamber geometry of diesel engine has a direct influence on the atomization and combustion of in-cylinder fuel. In order to meet the increasingly stringent emission regulations, a diesel engine was taken as the study object. The geometry of prototype ω-shaped combustion chamber was modified using AVL FIRE software under the premise of maintaining the same compression ratio. The annular convex structure and the center cam structure were introduced to construct the TCD combustion chamber. For TCD, the letter "T" stands for turbocharger, the letter "C" stands for charger air cooling, and the letter "D" stands for diesel particle filter. The structural parameters of TCD combustion chamber were then optimized. The effects of combustion chambers with different geometries on the performance and emissions of diesel engine were investigated using simulation. The results show that the performance of TCD combustion chamber is significantly influenced by the diameter of combustion chamber. Diameter that is either too large or too small will reduce the indicated power. The optimized TCD combustion chamber exhibits 0.98% increase in indicated power compared to that before optimization and 8.26% increase compared to the prototype ω-shaped combustion chamber. Furthermore, the soot emissions reduce by 67.19% compared to that before optimization and by 88.37% compared to the prototype ωshaped combustion chamber.