Combustion characteristics of droplets composed of light cycle oil and diesel light oil in a hot-air chamber☆

Xu, Guangwen; Ikegami, Masiki; Honma, Senji; Sasaki, Masahide; Ikeda, Kota; Nagaishi, Hiroshi; Takeshita, Yuji

doi:10.1016/s0016-2361(02)00276-4

Cited by 20 publications

(9 citation statements)

References 15 publications

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“…따라서, 다양한 액적 크기 (droplet size), 분위기 압력(ambient pressure) 등과 같은 연구 조건에서의 two phase fluid의 확산을 포함한 물리 적인 현상의 규명은 물론 액적의 질량(mass)과 열전달 (heat transfer)에 관한 기초 연구를 가능하게 하고 (3)(4)(5) , 물질 전달의 실험적•해석적인 연구들 (8)(9)(10)(11) 이 수행되었다. 또한, standing sound wave에서의 액적의 연소 특성 (12,13) , 입자 및 연료 액적의 연소에 관한 연구 (14)(15)(16)(17) , 전기장 (electric field)에서의 액적 연소에 관한 연구 (18) 가 수행 되었고, 다중 성분 액적(multi-component liquid droplet) (19) 과 이상 유체 혼합기(binary liquid mixture) (20) and velocity in an ultrasonic standing wave (21) 며 (7,11,21) , 주파수가 높을수록 분열이 빨리 진행되는 것으 로 판단된다. (7,11,21) 음향…”

Section: 서 론unclassified

Effect of Ultrasonic Frequency on the Atomization Characteristics of Single Water Droplet in an Acoustic Levitation Field

Suh

2013

Journal of ILASS-Korea

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This paper describes the effect of ultrasonic frequency(f) on the atomization and deformation characteristics of single water droplet in an acoustic levitation field. To achieve this, the ultrasonic levitator that can control sound pressure and velocity amplitude by changing frequency was installed, and visualization of single water droplet was conducted with high resolution ICCD and CCD camera. At the same time, atomization and deformation characteristics of single water droplet was studied in terms of normalized droplet diameter(d/d0), droplet diameter(d) variation and droplet volume(V) variation under different ultrasonic frequency(f) conditions. It was revealed that increase of ultrasonic frequency reduces the droplet diameter. Therefore, it is able to levitate with low sound pressure level. It also induces the wide oscillation range, large diameter and volume variation of water droplet. In conclusion, the increase of ultrasonic frequency(f) can enhance the atomization performance of single water droplet.

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Section: 서 론unclassified

Effect of Ultrasonic Frequency on the Atomization Characteristics of Single Water Droplet in an Acoustic Levitation Field

Suh

2013

Journal of ILASS-Korea

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“…Therefore, considering the increase of the situation where LCO is used as a part of a mixture product, the influence of using LCO on diesel engines should be clarified. Xu et al. , investigated the combustion of LCO single droplets in normal and microgravity conditions. Imhof et al investigated emissions of LCO water-in-fuel emulsions with a test engine to reduce NO x and unburned emission to follow the IMO regulation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Evaporation Characteristics of Light Cycle Oil Droplet under Various Ambient Conditions

et al. 2021

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The authors conducted droplet evaporation experiments of light cycle oil (LCO) at various ambient temperatures and pressures. Five kinds of LCO and three kinds of arranged fuels were used. We investigated the evaporation characteristics of LCO and the relationships between the evaporation characteristics and the cetane index. In addition to that, a surrogate fuel composed of four chemical species, which can simulate the droplet evaporation characteristics of LCO, was suggested. Experimental results show that the differences in droplet lifetime between fuel species become larger with decreasing ambient temperature. This is because the low volatile component made the evaporation rate outstandingly slow at a low ambient temperature. It was found that the relationship between droplet lifetime and the late-stage distillation temperature becomes stronger at low ambient temperature and high ambient pressure. By an analysis employing the properties of chemical species in LCO surrogate fuel, it is clarified that the mass evaporation rate becomes smaller than the internal diffusion, which is the condition similar to that in the distillation test. Finally, the relationship between the droplet lifetime and the cetane index was investigated. It can be concluded that the droplet lifetime is independent of the cetane index under all conditions tested in this study. The experimental data obtained by this research can be utilized for the validation of multicomponent fuel droplet evaporation models in the future.

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“…The majority of literature published on single droplet burning do not describe the technique used for determining droplet size throughout the burning process [1][2][3]. The most likely methods are either a manual method, where measurements are manually taken from the image as described in [4], or a method that uses commercial software to fit circles or ellipses to the droplet as described in [5].…”

Section: Introductionmentioning

confidence: 99%

Median ellipse parameterization for robust measurement of fuel droplet size

Greminger

Hoxie

2015

Meas. Sci. Technol.

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The combustion properties of blended fuel combinations can be characterized by performing single droplet fuel combustion experiments. These combustion experiments are visualized using high speed image acquisition. Once the high speed images are obtained, the burn rate and other characteristics of combustion, such as the occurrence of microexplosions, can be characterized. Currently these quantities are either measured manually or are measured using automated software. However, the current software packages used for this task are limited in that they can only measure droplets that are elliptical in shape and manual corrections often have to be made to avoid significant errors in the measurement. An automated droplet tracking algorithm is presented that can automatically track droplet size without manual intervention due to its robustness to the presence of missing or extra edges in the images. In addition, the proposed method can track shapes more general than ellipses, which is required in order to track the droplet during microexplosions. The proposed algorithm starts by fitting ellipses to numerous five point subsets from the droplet edge data. The closed contour is parameterized by determining the median perimeter of the set of ellipses. The resulting curve is not an ellipse, allowing arbitrary closed contours to be parameterized. The performance of the proposed algorithm and the performance of existing algorithms are compared to a ground truth segmentation of the fuel droplet images. This comparison demonstrates that the median ellipse parameterization algorithm has improved performance for both area quantification and edge deviation.

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Combustion characteristics of droplets composed of light cycle oil and diesel light oil in a hot-air chamber☆

Cited by 20 publications

References 15 publications

Effect of Ultrasonic Frequency on the Atomization Characteristics of Single Water Droplet in an Acoustic Levitation Field

Effect of Ultrasonic Frequency on the Atomization Characteristics of Single Water Droplet in an Acoustic Levitation Field

Experimental Study on Evaporation Characteristics of Light Cycle Oil Droplet under Various Ambient Conditions

Median ellipse parameterization for robust measurement of fuel droplet size

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