| Medium scale pool fires can be used to validate models of large scale accidental fires. In order to provide a relevant data set for model validation, laser induced incandescence (LII) was used to quantify soot volume fraction levels in heavily sooting pool fires of JP-8 and heptane. Qualitative measurements of OH were simultaneously imaged by a laser induced fluorescence (LIF) light sheet spatially overlapping the LII sheet. Findings are presented and the challenges of simultaneous imaging in heavily sooting turbulent conditions are identified. Supplemental multichord light extinction measurements served to calibrate the LII system, qualify the degree of axisymmetry of the turbulent flames, determine a correlation between extinction frequency and puffing frequency, and provide an independent method of measuring average soot volume fraction. Soot refractive index variation with sampling height (residence time) was investigated, and a discussion about whether or not diagnostic measurements warrant correction for its variation are discussed. |
