Two-Angle Ratio Scattering (STAR) Method for Real-Time Measurement of Agglomerate Soot Concentration and Size: Experimental Measurements

摘要

The Scattering by Two-Angle Ratio (STAR) light scattering method described in this (and companion) article has been developed and tested on a range of gas turbine and diesel engines. Research literature on optical parameters has been used (without resorting to arbitrary calibrations) to predict values of the gas phase soot mass concentration, which are in good agreement with gravimetric measurements. More than 90 measurements for gas turbine and diesel engines are shown for both in situ and sampling configurations of STAR. Results are obtained for transient concentrations ranging from less than 1 μg/m3 to 100 mg/m3 at data rates up to 10 Hz. Absolute concentration comparisons with gravimetric measurements agree with an R 2 correlation of 97% and have a precision of better than ±5%. These experimental results are consistent with the assumption that primary particle soot properties are nearly invariant for a wide range of engine operating conditions.