title: High-speed, three-dimensional tomographic laser-induced incandescence imaging of soot volume fraction in turbulent flames.
abstract: High-speed, laser-based tomographic imaging of the three-dimensional time evolution of soot volume fraction in turbulent jet diffusion flames is demonstrated to be feasible at rates of 10 kHz or higher. The fundamental output of a burst-mode Nd:YAG laser with 1 J/pulse is utilized for volumetric impulsive heating of soot particles with a laser fluence of 0.1 J/cm2, enabling signal-to-noise ratios of ~100:1 in images of the resulting incandescence. The three-dimensional morphology of the soot distribution is captured with a spatial resolution of <1.5 mm using as few as four viewing angles, with convergence of the soot volume fraction to within ~95% occurring with seven or more viewing angles. Uniqueness of the solution is demonstrated using two sets of eight images captured at the same time instant, with agreement to >90% in peak values between the two sets. These data establish parameters for successful high-speed, three-dimensional imaging of the soot volume fraction within highly transient combustion environments.
authors.forename: Terrence R
authors.initials: TR
authors.lastname: Meyer
authors.forename: Benjamin R
authors.initials: BR
authors.lastname: Halls
authors.forename: Naibo
authors.initials: N
authors.lastname: Jiang
authors.forename: Mikhail N
authors.initials: MN
authors.lastname: Slipchenko
authors.forename: Sukesh
authors.initials: S
authors.lastname: Roy
authors.forename: James R
authors.initials: JR
authors.lastname: Gord