Gas-phase temperature imaging in spray systems using multi-line NO-LIF thermometry
Two-dimensional gas-phase temp. fields were measured in spray flames and evapg. spray systems using laser-induced fluorescence (LIF) of nitric oxide (NO). The recently developed multi-line technique yields abs. temp. without calibration. It is successfully applied to temp. measurements in the presence of droplets. The method is based on the temp. dependence of the NO-LIF signal. Measurements were carried out in heated nitrogen flows at room temp. to validate the accuracy (< +- 1%) and precision (1%) of the technique by comparing results to thermocouple readings. Temp. measurements in a dil. evapg. acetone spray at room temp. showed cooling of the entrained air of 15 +- 6 K. Temp. imaging in an ethanol spray flame at various conditions yields the entire temp. range from the coflow temp. at 300 +- 4 K (1%) to the flame temp. at 1900 +- 40 K (2%).
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