Two-dimensional temperature measurements in an SI engine using two-line tracer LIF
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.
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