Lean burn combustion systems have the potential to reduce CO2 emissions, and for that reason this project seeks to develop them further. The SGDI project is currently focusing on stratified combustion.
The objectives of the current project are:
To quantify emissions, especially particulates (number, size, and mass), under various engine operating conditions and to understand how they can be minimized under realistic operating conditions.
Quantify factors affecting combustion stability in a stratified combustion system.
Compare stratified operation to homogeneous operation with respect to emissions and fuel consumption under various operating conditions.
Measurements are conducted in a metal engine, an optically accessible single-cylinder engine, and a spray vessel. Both outward-opening, piezo-actuated injectors and solenoid-actuated multi-hole injectors are under investigation. Engine-out particulate are sampled according to the Particulate Measurement Programme (PMP) protocols and detected by a Cambustion DMS500 Mk2 particle analyzer. Advanced optical methods such as Phase Doppler Interferometry (PDI), Laser Induced Fluorescence (LIF), Mie scattering, Laser Induced Exciplex Fluorescence (LIEF), High-speed photography, and Direct imaging are used as well.