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

Authors with CRIS profile

How to cite


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://dx.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.

BibTeX: Download