Impact of Piston Ring Gap on the Thermodynamic Performance of Gasoline Direct Injection Engines.

With escalating environmental standards and the pursuit of energy efficiency, Gasoline Direct Injection (GDI) technology has become crucial for enhancing engine performance and reducing emissions. As a vital component of the engine, the design of the piston ring significantly influences the thermodynamic performance of the engine. This paper systematically studies the thermodynamic impact of piston ring gaps in GDI engines. Initially, through the analysis of heat transfer and piston strength associated with piston ring gaps, the effects on engine thermal efficiency and structural stability are explored. Subsequently, by integrating three different thermal analysis boundary conditions and mechanical load conditions, we assess how these variables affect the piston's thermal state and engine performance. Existing studies, often relying on simplified models or empirical formulas, tend to overlook the complex thermodynamic and mechanical interactions under actual operating conditions, resulting in inadequate predictive accuracy. This research introduces more complex boundary condition simulations, aiming to provide a more precise method for predicting piston performance, thus offering theoretical support and practical guidance for the optimization of GDI engine design. This study not only fills the research gap regarding piston ring gaps but also provides new perspectives and data support for engine design and optimization, contributing to the advancement of efficient, low-emission engine technologies. [ABSTRACT FROM AUTHOR]