Abstract
This study presents the one-dimensional thermodynamic assessment of a novel two-stroke, direct-injection aircraft Diesel engine incorporating two original mechanical elements, a dedicated cylinder architecture, and a dual-role crankshaft. The cylinder combines piston-controlled scavenging ports with a laterally integrated exhaust valve, while the crankshaft performs both its conventional power-transmission function and the direct mechanical actuation of the exhaust valve. This arrangement enables uniflow gas exchange without a conventional camshaft dedicated to exhaust-valve actuation. The engine further employs an analogue control architecture, wet-sump lubrication, turbocharging and charge-air cooling. The previously developed three-dimensional mechanical configuration is implemented in AVL BOOST and investigated using the AVL Mixing Controlled Combustion (AVL-MCC) model at a compressor pressure ratio of 3.0. Gas exchange, boosting, in-cylinder thermodynamics, combustion, heat transfer and indicated and brake performance are evaluated as coupled processes. The study establishes the functional relationship between the proposed cylinder–crankshaft architecture and the predicted thermodynamic response of the complete engine, providing a system-level numerical assessment of the proposed aircraft-engine concept.