2024 Stuttgart International Symposium 

Automotive and Engine Technology

2 - 3 July 2024

Session: HYDROGEN II | | 18:00 - 18:30

A fast and reliable CFD Approach to design Hydrogen SI Engines for industrial Applications

Federico Ramognino, Politecnico di Milano

SI engines fueled with hydrogen represent a promising powertrain solution to meet the ambitious target of carbon-free emissions at the tailpipe. Therefore, fast and reliable numerical tools can significantly support the automotive industry in the optimization of such technology. In this work, a 1D-3D methodology is presented to simulate in detail the combustion process with minimal computational effort. First, a 1D analysis of the complete engine cycle is carried out on the user-defined powertrain configuration. The purpose is to achieve reliable boundary conditions for the combustion chamber, based on realistic engine parameters. Then, a 3D simulation of the power-cycle is performed to mimic the combustion process. The flow velocity and turbulence distributions are initialized without the need of simulating the gas exchange process, according to a validated technique. However, coupled 1D-3D simulations of the engine scavenging can be carried out as well to increase the accuracy of the predicted IVC flow fields. The proposed methodology was validated against experimental measurements from a pent-roof single-cylinder SI engine, in which different values of hydrogen-air dilution were investigated. The achieved results were able to capture the measured pressure and heat release trends, demonstrating the industrial applicability of the presented methodology.