Aviation heavy-fuel spark ignition (SI) piston engines have been paid more and more attention in the area of small aviation. Aviation heavy-fuel refers to aviation kerosene or light diesel fuel, which is safer to use and store compared to gasoline fuel. And diesel fuel is more suitable for small aviation application on land. In this study, numerical simulation was performed to evaluate the possibility of switching from gasoline direct injection spark ignition (DISI) to diesel DISI combustion. Diesel was injected into the cylinder by original DI system and ignited by spark. In the simulation, computational models were calibrated by test data from a DI engine. Based on the calibrated models, furthermore, the behavior of diesel DISI combustion was investigated. The results indicate that diesel DISI combustion is slower compared to gasoline, and the knock tendency of diesel in SI combustion is higher. For a diesel/air mixture with an equivalence ratio of 0.6 to 1.4, higher combustion pressure and faster burning rate occur when the equivalence ratios are 1.2 and 1.0, but the latter has a higher possibility of knock. In summary, the SI combustion of diesel fuel with a rich mixture can achieve better combustion performance in the engine.

在小型航空领域，航空重油火花点火（SI）活塞发动机越来越受到关注。航空重油是指航空煤油或轻柴油，与汽油相比，使用和储存更安全。柴油更适合陆地上的小型航空应用。在这项研究中，进行了数值模拟，以评估从汽油直喷火花点火（DISI）转换为柴油DISI燃烧的可能性。柴油通过原始的DI系统注入到气缸中，并被火花点燃。在仿真中，通过来自DI引擎的测试数据来校准计算模型。此外，在校准模型的基础上，还研究了柴油DISI燃烧的行为。结果表明，柴油DISI燃烧比汽油慢，SI燃烧中柴油的爆震趋势较高。对于当量比为0.6到1.4的柴油/空气混合物，当当量比为1.2和1.0时，燃烧压力更高，燃烧速率更快，但是后者的爆燃可能性更高。总而言之，具有浓混合气的柴油的SI燃烧可以在发动机中实现更好的燃烧性能。