Quantifying liquid boundary and vapor distributions in a fuel spray by rainbow schlieren deflectometry

Taber Wanstall, C.; Agrawal, Ajay K.; Bittle, Joshua A.

doi:10.1364/AO.56.008385

Title: Quantifying liquid boundary and vapor distributions in a fuel spray by rainbow schlieren deflectometry

Journal Article · Sun Jan 01 00:00:00 EST 2017 · Applied Optics

DOI:https://doi.org/10.1364/AO.56.008385· OSTI ID:1429110

Taber Wanstall, C. ^[1]; Agrawal, Ajay K. ^[1]; Bittle, Joshua A. ^[1]

Univ. of Alabama, Tuscaloosa, AL (United States). Mechanical Engineering Dept.

The rainbow schlieren deflectometry (RSD) technique is used to determine the liquid boundary and the fuel volume fraction distributions in the vapor region of a high-pressure fuel spray. Experiments were conducted in a constant pressure flow vessel, whereby a customized single-hole common-rail diesel injector is used to introduce n-heptane fuel into a coflow of low-speed ambient air at two different test conditions. Only the quasi-steady period of the fuel spray is considered, and multiple injections are performed to acquire statistically significant data at an image acquisition rate of 20 kHz. An algorithm to identify the liquid boundary using intensity recorded by the RSD images is presented. The results are compared against measurements obtained by the Mie scattering technique. Our results demonstrate that the RSD can be a powerful optical diagnostics technique to simultaneously quantify both the vapor and liquid regions in the high-pressure fuel sprays.

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Research Organization:: Univ. of Alabama, Tuscaloosa, AL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); United States Army Tank Automotive Research, Development and Engineering Center (TARDEC)

Grant/Contract Number:: EE0007301

OSTI ID:: 1429110

Alternate ID(s):: OSTI ID: 1399637

Journal Information:: Applied Optics, Vol. 56, Issue 30; ISSN 1559-128X

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Characterization of the liquid phase of vaporizing GDI sprays from Schlieren imaging Lazzaro, Maurizio Measurement Science and Technology, Vol. 30, Issue 8 https://doi.org/10.1088/1361-6501/ab228d	journal	July 2019

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