Abstract
KEYWORDS:
IC-Engine, Scavenging, Mixture Formation, Combustion, Simulation
ABSTRACT:
The requirements on future internal combustion engines # from high power-to-weight ratio and acceleration response to the significant reduction of fuel consumption and pollutant emission # determine an increasing complexity of their thermodynamic processes. An optimum adaptation of the main process stages # scavenging, fuel supply, mixture formation, combustion # for every combination of load and speed requires their exact analysis, which is practically not feasible by an unique simulation tool or by experiments only. This paper presents a method of coupling and adjustment of suitable numerical models and experimental routines in a coherent analysis strategy. 1D and 3D CFD codes such as AMESim, BOOST, FIRE and VECTIS are focused on specific process forms and connected in a system of input/output parameters. Validation, calibration and additional attributes of particular transformations of state are obtained by specific experimental tests. The final result is evaluated in base of the function analysis at the engine test bench. This strategy allows an advantageous configuration of functional elements such as supercharger, intake and exhaust system geometry, valve timing, injection rate when using direct injection, combustion chamber geometry, spark plug and injector location.