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Title: Development of limited-view tomography for measurement of Spray G plume direction and liquid volume fraction

Abstract

The method for direct injection of fuel in the cylinder of an IC engines is important to high-efficiency and low-emission performance. Optical spray diagnostics plays an important role in understanding plume movement and interaction for multi-hole injectors, and providing baseline understanding used for computational optimization of fuel delivery. Traditional planar or line-of-sight diagnostics fail to capture the liquid distribution because of optical thickness concerns. This work proposes a high-speed (67 kHz) extinction imaging technique at various injector rotations coupled to computed tomography (CT) for time-resolved reconstruction of liquid volume fraction in three dimensions. The number of views selected and processing were based on synthetic (modeled) liquid volume fraction data where extinction and CT adequately reconstructed each plume. The exercise showed that for an 8-hole, symmetric-design injector (ECN Spray G), only three different views are enough to reproduce the direction of each plume, and particularly the mean plume direction. Therefore, the number of views was minimized for experiments to save expense. Measurements applying this limited-view technique confirm plume–plume variations also detected with mechanical patternation, while providing better spatial and temporal resolution than achieved previously. Uncertainties due to the limited view within pressurized spray chambers, the droplet size, and optically thick regions aremore » discussed.« less

Authors:
ORCiD logo; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1619315
Alternate Identifier(s):
OSTI ID: 1770782
Report Number(s):
SAND-2021-2524J
Journal ID: ISSN 0723-4864; 51; PII: 2885
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Published Article
Journal Name:
Experiments in Fluids
Additional Journal Information:
Journal Name: Experiments in Fluids Journal Volume: 61 Journal Issue: 2; Journal ID: ISSN 0723-4864
Publisher:
Springer Science + Business Media
Country of Publication:
Germany
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Weiss, Lukas, Wensing, Michael, Hwang, Joonsik, Pickett, Lyle M., and Skeen, Scott A. Development of limited-view tomography for measurement of Spray G plume direction and liquid volume fraction. Germany: N. p., 2020. Web. doi:10.1007/s00348-020-2885-0.
Weiss, Lukas, Wensing, Michael, Hwang, Joonsik, Pickett, Lyle M., & Skeen, Scott A. Development of limited-view tomography for measurement of Spray G plume direction and liquid volume fraction. Germany. doi:https://doi.org/10.1007/s00348-020-2885-0
Weiss, Lukas, Wensing, Michael, Hwang, Joonsik, Pickett, Lyle M., and Skeen, Scott A. Mon . "Development of limited-view tomography for measurement of Spray G plume direction and liquid volume fraction". Germany. doi:https://doi.org/10.1007/s00348-020-2885-0.
@article{osti_1619315,
title = {Development of limited-view tomography for measurement of Spray G plume direction and liquid volume fraction},
author = {Weiss, Lukas and Wensing, Michael and Hwang, Joonsik and Pickett, Lyle M. and Skeen, Scott A.},
abstractNote = {The method for direct injection of fuel in the cylinder of an IC engines is important to high-efficiency and low-emission performance. Optical spray diagnostics plays an important role in understanding plume movement and interaction for multi-hole injectors, and providing baseline understanding used for computational optimization of fuel delivery. Traditional planar or line-of-sight diagnostics fail to capture the liquid distribution because of optical thickness concerns. This work proposes a high-speed (67 kHz) extinction imaging technique at various injector rotations coupled to computed tomography (CT) for time-resolved reconstruction of liquid volume fraction in three dimensions. The number of views selected and processing were based on synthetic (modeled) liquid volume fraction data where extinction and CT adequately reconstructed each plume. The exercise showed that for an 8-hole, symmetric-design injector (ECN Spray G), only three different views are enough to reproduce the direction of each plume, and particularly the mean plume direction. Therefore, the number of views was minimized for experiments to save expense. Measurements applying this limited-view technique confirm plume–plume variations also detected with mechanical patternation, while providing better spatial and temporal resolution than achieved previously. Uncertainties due to the limited view within pressurized spray chambers, the droplet size, and optically thick regions are discussed.},
doi = {10.1007/s00348-020-2885-0},
journal = {Experiments in Fluids},
number = 2,
volume = 61,
place = {Germany},
year = {2020},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1007/s00348-020-2885-0

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Cited by: 1 work
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