Details
| Original language | English |
|---|---|
| Publication status | Published - 2020 |
| Event | 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018 - Chicago, United States Duration: 22 Jul 2018 → 26 Jul 2018 |
Conference
| Conference | 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018 |
|---|---|
| Country/Territory | United States |
| City | Chicago |
| Period | 22 Jul 2018 → 26 Jul 2018 |
Abstract
Droplet characteristics near the nozzle in diesel sprays are required to understand the atomization process and also to validate numerical simulation and breakup models. The breakup of droplets near the nozzle is mainly induced by turbulence, cavitation and aero dynamic force. Not only droplet size decreasing but also fluctuations on droplet velocity and flight angle occur in the breakup region. Several measurement techniques are developed but techniques which are able to obtain droplets properties near the nozzle where the breakup occurs are quite few. Laser 2-Focus Velocimeter (L2F) is one of the techniques and it is based on the measurement of time-of-flight and time-of-scattering when a droplet flies through two foci. The L2F measurements are conducted under 50 and 100 MPa injection pressures at the spray center, periphery and the middle of them at 5, 10 and 15 mm downstream from the nozzle. Time resolved velocities on spray axis are discussed with the velocity results from X-ray Phase Contrast Velocimetry (PCV) and the estimated velocity from mass flow rate measurements on the same injector system and operating condition. The velocity results from these measurement show good agreement. The velocity and size of droplets and fluctuations of droplets flight angles are characterized to discuss the relation on fluctuations and atomization. The results show that the standard deviation of velocity and size are high near the nozzle at spray center where the droplets size is relatively large. Also, there are high fluctuations on droplets flight angle compared to that at periphery.
Keywords
- Diesel, Droplet, Laser diagnostics
ASJC Scopus subject areas
- Materials Science(all)
- Surfaces, Coatings and Films
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
2020. Paper presented at 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018, Chicago, United States.
Research output: Contribution to conference › Paper › Research › peer review
}
TY - CONF
T1 - Fluctuations of droplet characteristics in diesel fuel atomization
AU - Kawaharada, N.
AU - Gröger, K.
AU - Ueki, H.
AU - Wang, J.
AU - Dinkelacker, F.
N1 - Publisher Copyright: © 2018 Solar Turbines Incorporated.
PY - 2020
Y1 - 2020
N2 - Droplet characteristics near the nozzle in diesel sprays are required to understand the atomization process and also to validate numerical simulation and breakup models. The breakup of droplets near the nozzle is mainly induced by turbulence, cavitation and aero dynamic force. Not only droplet size decreasing but also fluctuations on droplet velocity and flight angle occur in the breakup region. Several measurement techniques are developed but techniques which are able to obtain droplets properties near the nozzle where the breakup occurs are quite few. Laser 2-Focus Velocimeter (L2F) is one of the techniques and it is based on the measurement of time-of-flight and time-of-scattering when a droplet flies through two foci. The L2F measurements are conducted under 50 and 100 MPa injection pressures at the spray center, periphery and the middle of them at 5, 10 and 15 mm downstream from the nozzle. Time resolved velocities on spray axis are discussed with the velocity results from X-ray Phase Contrast Velocimetry (PCV) and the estimated velocity from mass flow rate measurements on the same injector system and operating condition. The velocity results from these measurement show good agreement. The velocity and size of droplets and fluctuations of droplets flight angles are characterized to discuss the relation on fluctuations and atomization. The results show that the standard deviation of velocity and size are high near the nozzle at spray center where the droplets size is relatively large. Also, there are high fluctuations on droplets flight angle compared to that at periphery.
AB - Droplet characteristics near the nozzle in diesel sprays are required to understand the atomization process and also to validate numerical simulation and breakup models. The breakup of droplets near the nozzle is mainly induced by turbulence, cavitation and aero dynamic force. Not only droplet size decreasing but also fluctuations on droplet velocity and flight angle occur in the breakup region. Several measurement techniques are developed but techniques which are able to obtain droplets properties near the nozzle where the breakup occurs are quite few. Laser 2-Focus Velocimeter (L2F) is one of the techniques and it is based on the measurement of time-of-flight and time-of-scattering when a droplet flies through two foci. The L2F measurements are conducted under 50 and 100 MPa injection pressures at the spray center, periphery and the middle of them at 5, 10 and 15 mm downstream from the nozzle. Time resolved velocities on spray axis are discussed with the velocity results from X-ray Phase Contrast Velocimetry (PCV) and the estimated velocity from mass flow rate measurements on the same injector system and operating condition. The velocity results from these measurement show good agreement. The velocity and size of droplets and fluctuations of droplets flight angles are characterized to discuss the relation on fluctuations and atomization. The results show that the standard deviation of velocity and size are high near the nozzle at spray center where the droplets size is relatively large. Also, there are high fluctuations on droplets flight angle compared to that at periphery.
KW - Diesel
KW - Droplet
KW - Laser diagnostics
UR - http://www.scopus.com/inward/record.url?scp=85090321664&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85090321664
T2 - 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018
Y2 - 22 July 2018 through 26 July 2018
ER -