New One Shot Engine Validation Based on Aerodynamic Characterization and Preliminary Combustion Tests

Abstract

Among the technological solutions proposed to reduce air pollutants and greenhouse gas emissions, the so-called “downsizing” operating mode for internal combustion engines is considered one of the most promising. By boosting the intake air pressure, this operating mode achieves higher efficiency, thus reducing pollutant emissions. Modelling the combustion process in these drastic conditions (high pressure, high temperature and high dilution rate) remains challenging, however, as classical models of premixed turbulent combustion prove insufficiently robust. The present work presents, characterizes and validates a dedicated apparatus based on the innovative new one shot engine (NOSE) to investigate turbulent premixed flames under these drastic conditions. The great flexibility of NOSE can generate different internal flow aerodynamic conditions as well as temperature and pressure values, up to a turbulent intensity of 3.3 m/s at 21 bar and 585 K, so at a Ka number ~ 10, with a characteristic integral length of 2 mm. The first milestones of the present work focus on the aerodynamic characterization of NOSE with different ad-hoc studied configurations. The validation of the setup is supported by some examples of the combustion tests performed.