Laser-induced-fluorescence imaging of NO in an n-heptane- and diesel-fuel-driven diesel engine

Continuous on-line imaging by 2D-LIF techniques of in-cylinder NO distributions in a running Diesel engine is explored using an ArF-excimer laser at 193 nm operating at low power. For the first time NO excitation spectra could be measured as a result of high optical transparencies during measurements over longer periods of time. The averaged distributions show different combustion behaviour of both fuels proving the potential of the 2D-LIF technique in application to non-intrusive combustion diagnostics in a steady running Diesel engine.