A High Dilution Stoichiometric Combustion Concept Using a Wide Variable Spark Gap and In-Cylinder Air Injection in Order to Meet Future CO₂Requirements and World Wide Emission Regulations

Starting to Unpick the Unique Air–Fuel Mixing Dynamics in the Recuperated Split Cycle Engine

“…Air assisted fuel injectors have been mooted in the past [27][28][29][30][31][32][33][34]. In these studies, air assisted atomisation displayed promise for enhancing fuel atomisation, but adoption of air assisted atomisation in a conventional ICE architecture has so far been deemed prohibitive by manufacturers, possibly due to the potential gain versus the complexity and cost of adding and operating an auxiliary high pressure air system.…”

“…The RSCE architecture lends itself to a form of high-pressure air assisted fuel atomisation, as a high-pressure working fluid source is readily available. However, the case in the RSCE differs from the air assisted atomisation literature [27][28][29][30][31][32][33][34], as the chamber pressure is low at the start of the air and fuel injection, and the air is heated by exhaust gas. This enables a higher-pressure difference than performed in the assist air literature to date and creates a lag in temperature equalisation, as the air expands and then compresses downstream of the poppet valves.…”