Application of a high-repetition-rate laser diagnostic system for single-cycle-resolved imaging in internal combustion engines.
High-repetition-rate laser-induced fluorescence measurements of fuel and OH concentrations in internal combustion engines are demonstrated. Series of as many as eight fluorescence images, with a temporal resolution ranging from 10 micros to 1 ms, are acquired within one engine cycle. A multiple-laser system in combination with a multiple-CCD camera is used for cycle-resolved imaging in spark-ignition, direct-injection stratified-charge, and homogeneous-charge compression-ignition engines. The recorded data reveal unique information on cycle-to-cycle variations in fuel transport and combustion. Moreover, the imaging system in combination with a scanning mirror is used to perform instantaneous three-dimensional fuel-concentration measurements.
Department of Combustion Physics, Lund Institute of Technology, Sweden. johan.hult@forbrf.lth.se
Johan
J
Hult
Mattias
M
Richter
Jenny
J
Nygren
Marcus
M
Aldén
Anders
A
Hultqvist
Magnus
M
Christensen
Bengt
B
Johansson