Abstract
This work reports the experimental demonstration of single-shot visualization of turbulent flows in all three spatial dimensions (3D) based on volumetric laser induced fluorescence (VLIF). The measurements were performed based on the LIF signal of iodine (I2) vapor seeded in the flow. In contrast to established planar LIF (PLIF) technique, the VLIF technique excited the seeded I2 vapor volumetrically by a thick laser slab. The volumetric LIF signals emitted were then simultaneously collected by a total of five cameras from five different orientations, based on which a 3D tomographic reconstruction was performed to obtain the 3D distribution of the I2 vapor in the target flow. Single-shot measurements (with a measurement duration of a few ns) were demonstrated in a 50 mm × 50 mm × 50 mm volume with a nominal spatial resolution of 0.42 mm and an actual resolution of ~0.71 mm in all three dimensions (corresponding to a total of 120 × 120 × 120 voxels).
Highlights
Optical diagnostics based on laser induced fluorescence (LIF) have been extensively researched and applied in the past [1, 2]
One possible approach of such extension is a scanning planar LIF (PLIF) technique, in which the excitation laser sheet used in the PLIF technique was scanned across multiple spatial locations sequentially, and the 2D measurements obtained at these locations were stacked together to form a 3D measurement [12,13,14,15,16]
This work reports the experimental demonstration of single-shot measurements in turbulent flows vapor using volumetric laser induced fluorescence (VLIF)
Summary
Optical diagnostics based on laser induced fluorescence (LIF) have been extensively researched and applied in the past [1, 2]. One possible approach of such extension is a scanning PLIF (planar laser induced fluorescence) technique, in which the excitation laser sheet used in the PLIF technique was scanned across multiple spatial locations sequentially, and the 2D measurements obtained at these locations were stacked together to form a 3D measurement [12,13,14,15,16] Even though this approach was conceptually straightforward and has been explored earlier [12, 17], it is not trivial to obtain quantitative measurements with sufficient temporal and spatial resolution. A tomographic algorithm [22,23,24,25,26,27] is employed to reconstruct the 3D distribution of the target species based on such projection measurements, as elaborated in Sections 2 immediately below
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