Details
| Original language | English |
|---|---|
| Publication status | Published - 2015 |
| Event | 13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015 - Tainan, Taiwan Duration: 23 Aug 2015 → 27 Aug 2015 |
Conference
| Conference | 13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015 |
|---|---|
| Country/Territory | Taiwan |
| City | Tainan |
| Period | 23 Aug 2015 → 27 Aug 2015 |
Abstract
The liquid core length of diesel spray is important information for understanding and modeling the spray break-up process. However, standard optical diagnostic methods are failing to visualize the spray determining break-up zone due to the high optical density of diesel spray. The optical connectivity method (OCM) is a promising approach to address this problem. Here, the liquid phase of the spray is internally illuminated by laser light coming from the inside of the nozzle. In former works, this light for this was coupled into the nozzle sac by an optical fiber. While optical fibers can easily withstand the temperature of ambient air, they cannot be used in hot conditions such as in the hot charge of a high-temperature high-pressure injection chamber. To avoid this shortcoming, the remote optical connectivity method (ROCM) was developed. Here, the optical path of the OCM was redesigned in order to avoid as much as possible heat-exposed fiber surface (Figure 1). For a first validation study, atmospheric measurements were conducted by sampling images of the liquid core by a high-speed camera equipped as well with a photographic lense as with a long distance microscope (LDM). Here, the break-up length under various injection pressures could be quantitatively measured. The typical trend of a shortening of the break-up length with increasing injection pressures was observed. Also, the measurement results showed that the liquid core length was nearly constant at the steady state of the injection. Especially at low injection pressures, a remarkable waviness of the break-up zone was observable.
Keywords
- Break-up length, Diesel spray, High-speed measurement, Laser, Liquid core, Optical connectivity method, Surface waves
ASJC Scopus subject areas
- Materials Science(all)
- Surfaces, Coatings and Films
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
2015. Paper presented at 13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015, Tainan, Taiwan.
Research output: Contribution to conference › Paper › Research › peer review
}
TY - CONF
T1 - Introduction of the remote optical connectivity method
AU - Kaiser, M.
AU - Kawaharada, N.
AU - Hara, T.
AU - Gröger, K.
AU - Dinkelacker, F.
N1 - Publisher Copyright: © 2015 International Conference on Liquid Atomization and Spray Systems. All rights reserved.
PY - 2015
Y1 - 2015
N2 - The liquid core length of diesel spray is important information for understanding and modeling the spray break-up process. However, standard optical diagnostic methods are failing to visualize the spray determining break-up zone due to the high optical density of diesel spray. The optical connectivity method (OCM) is a promising approach to address this problem. Here, the liquid phase of the spray is internally illuminated by laser light coming from the inside of the nozzle. In former works, this light for this was coupled into the nozzle sac by an optical fiber. While optical fibers can easily withstand the temperature of ambient air, they cannot be used in hot conditions such as in the hot charge of a high-temperature high-pressure injection chamber. To avoid this shortcoming, the remote optical connectivity method (ROCM) was developed. Here, the optical path of the OCM was redesigned in order to avoid as much as possible heat-exposed fiber surface (Figure 1). For a first validation study, atmospheric measurements were conducted by sampling images of the liquid core by a high-speed camera equipped as well with a photographic lense as with a long distance microscope (LDM). Here, the break-up length under various injection pressures could be quantitatively measured. The typical trend of a shortening of the break-up length with increasing injection pressures was observed. Also, the measurement results showed that the liquid core length was nearly constant at the steady state of the injection. Especially at low injection pressures, a remarkable waviness of the break-up zone was observable.
AB - The liquid core length of diesel spray is important information for understanding and modeling the spray break-up process. However, standard optical diagnostic methods are failing to visualize the spray determining break-up zone due to the high optical density of diesel spray. The optical connectivity method (OCM) is a promising approach to address this problem. Here, the liquid phase of the spray is internally illuminated by laser light coming from the inside of the nozzle. In former works, this light for this was coupled into the nozzle sac by an optical fiber. While optical fibers can easily withstand the temperature of ambient air, they cannot be used in hot conditions such as in the hot charge of a high-temperature high-pressure injection chamber. To avoid this shortcoming, the remote optical connectivity method (ROCM) was developed. Here, the optical path of the OCM was redesigned in order to avoid as much as possible heat-exposed fiber surface (Figure 1). For a first validation study, atmospheric measurements were conducted by sampling images of the liquid core by a high-speed camera equipped as well with a photographic lense as with a long distance microscope (LDM). Here, the break-up length under various injection pressures could be quantitatively measured. The typical trend of a shortening of the break-up length with increasing injection pressures was observed. Also, the measurement results showed that the liquid core length was nearly constant at the steady state of the injection. Especially at low injection pressures, a remarkable waviness of the break-up zone was observable.
KW - Break-up length
KW - Diesel spray
KW - High-speed measurement
KW - Laser
KW - Liquid core
KW - Optical connectivity method
KW - Surface waves
UR - http://www.scopus.com/inward/record.url?scp=85061166195&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85061166195
T2 - 13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015
Y2 - 23 August 2015 through 27 August 2015
ER -