3D mapping of droplet Sauter mean diameter in sprays

Mishra YN, Kögl M, Baderschneider K, Hofbeck B, Berrocal E, Conrad C, Will S, Zigan L (2019)

Publication Type: Journal article

Publication year: 2019


Book Volume: 58

Pages Range: 3775-3783

Journal Issue: 14

DOI: 10.1364/AO.58.003775


In this study, we report on the three-dimensional (3D) characterization of a spray in terms of its droplet Sauter mean diameter (SMD) using the laser-induced fluorescence (LIF)/Mie ratio technique. The spray structure is analyzed for a multi-hole direct-injection spark ignition (DISI) injector. A calibration curve to convert the LIF/Mie ratio to droplet diameter is deduced using LIF/Mie imaging and analysis of single droplets generated by a droplet generator. The DISI spray investigated here is optically sectioned by means of two-phase structured laser illumination planar imaging to suppress the intensity of multiple light scattering from LIF and Mie images prior to their ratio. A series of calibrated LIF/Mie ratio images of spray is then recorded at several depths along the z direction following the light sheet scanning of the spray. The droplet SMD ranges from less than 5 mu m up to a maximum of 50 mu m in single-shot images. The averaged SMD results (1-30 mu m) obtained by using the calibration curve from the droplet generator are compared with measurement results from phase-Doppler anemometry. Finally, a 3D map is reconstructed from the successive 2D layers generated from spray scanning. The resulting 3D representation of the droplet SMD shows a non-symmetric spray structure produced by the studied multi-hole injector, which cannot be resolved by analyzing only one central plane. (C) 2019 Optical Society of America

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Mishra, Y.N., Kögl, M., Baderschneider, K., Hofbeck, B., Berrocal, E., Conrad, C.,... Zigan, L. (2019). 3D mapping of droplet Sauter mean diameter in sprays. Applied Optics, 58(14), 3775-3783. https://doi.org/10.1364/AO.58.003775


Mishra, Yogeshwar Nath, et al. "3D mapping of droplet Sauter mean diameter in sprays." Applied Optics 58.14 (2019): 3775-3783.

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