12 research outputs found
Large Eddy Simulation and PIV Measurements of Unsteady Premixed Flames Accelerated by Obstacles
Effective Geometric F-ront Dynamics for Premixed Turbulent Combustion With Separated Velocity Scales
Simultaneous Flow Field and Fuel Concentration Imaging at 4.8 kHz in an Operating Engine
High-speed particle image velocimetry (PIV) and planar laser induced fluorescence (PLIF) techniques are combined to acquire flow field and fuel concentration in a spray-guided spark-ignited direct-injection (SG-SIDI) engine under motored and fired operation. This is a crucial step to enable studies that seek correlations between marginal engine operation (misfires or partial burns) and local, instantaneous mixture and flow conditions. Correlated flow and fuel data are extracted from a 4 mm_4 mm sub-region directly downstream the spark plug to characterize the in-cylinder conditions next to the spark plug during the spray and ignition event. Values of equivalence ratio, velocity magnitude, shear strain rate, and vorticity all increase during the spray event and decrease an order of magnitude during the duration of the spark event.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/86778/1/Sick15.pd