Comparison of the Lift-Off Lengths Obtained by Simultaneous OH-LIF and OH∗ Chemiluminescence Imaging in an Optical Heavy-Duty Diesel Engine
The presence of OH radicals as a marker of the high temperature reaction region usually has been used to determine the lift-off length (LOL) in diesel engines. Both OH Laser Induced Fluorescence (LIF) and OH∗ chemiluminescence diagnostics have been widely used in optical engines for measuring the LOL. OH∗ chemiluminescence is radiation from OH being formed in the exited states (OH∗). As a conseque