Two-dimensional temperature measurements in an SI engine using two-line tracer LIF
In: SAE Technical Paper Series 982468, (1998)
Zeitschriftenaufsatz / Fach: Maschinenbau
Transient two-dimensional temperature distributions in the compression stroke and in the unburned end-gas of an SI engine were measured employing laser-induced fluorescence (LIF) of a fuel marker that possesses strongly temperature-dependent spectroscopic proper-ties. The use of two different excitation wavelengths sim-plifies the otherwise complicated relation between LIF signal intensity and system parameters. The temperature fields obtained in this manner can be used to correct measured tracer-LIF maps and thus help to determine fuel distributions. Averaged temperature fields are com-pared to model calculations based on a homogeneous reactor assumption.