Investigation of ignition process from visible to infrared by a high speed colour camera

Wang, Y.; Zheng, Lukai; Woolley, R.; Zhang, Y.

doi:10.1016/j.fuel.2016.08.010

Cited by 25 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work, we selected and defined three different regions as follows: Region 1 includes Hue signal from 118-152° and represents premixed combustion, and this region typically covers the blue-green color bands. Region 2 is in the range of 300-360° and represents red to infrared wavelengths, and this region primarily represents the fuel pyrolysis process [25,29,30]. Finally, Region 3 covers the range from 0-90°, which stands for the signal emitted from soot formation.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Differences in pool-fire induced soot production between subcooled spray and flash boiling spray in a DISI engine

Cui

Sun

et al. 2021

ICLASS

View full text Add to dashboard Cite

Pool fire and fuel-rich combustion have been considered the primary soot/particulate matter sources for gasoline direct injection (GDI) engines, which is a crucial issue for commercial and passenger vehicles. Flash boiling atomization, achieved by heating the fuel before injection, can notably improve spray atomization and reduce the occurrence of pool fire, thus reduce soot emission under extreme conditions. This investigation compared the performance of subcooled spray combustions and flash boiling spray combustions with the use of an optical engine facility. The optical engine was equipped with an optical liner so that side views of the combustion can be captured with a high-speed color camera. The high-speed measurement data from early injection conditions were then analyzed with the HSV color model to investigate the flame characteristics in the premixed, infrared, and diffusion flame regions. Indicated mean effective pressure (IMEP) and particulate number (PN) under different conditions were also analyzed under different conditions. It was found that the combustion performance using flash boiling sprays is superior to that using subcooled sprays, and the difference between the two combustion modes was discussed with the use of the flame model.

show abstract

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Differences in pool-fire induced soot production between subcooled spray and flash boiling spray in a DISI engine

Cui

Sun

et al. 2021

ICLASS

View full text Add to dashboard Cite

show abstract

“…The soot radiation concentration analysis method introduced by Huang and Zhang was successfully applied to various combustion performance evaluations. , The sooty flame region and blue chemiluminescence included regions that can be identified and separated based on the post-processing image method introduced by Wang et al; hence, the blue flame of the captured images was filtered within the hue-value band ranging from 180° to 252°, while the sooty flame was filtered within the range from 10° to 70°, as shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

Effects of Alternative Fuel Properties on Particulate Matter Produced in a Gas Turbine Combustor

et al. 2018

View full text Add to dashboard Cite

Diversified fuel supplies and stringent environmental pollution regulations in the aviation sector have promoted the development of the alternative fuels industry. The chemical and physical properties of some of these diverse fuel substitutes lie outside of historical experience. Therefore, their combustion behavior cannot be judged via research of petroleum-derived jet fuel. Particulate matter (PM) emissions are important for future alternative fuels, although extensive results in relations to combustors are not available in the literature. Hence, large-scale experimental testing is essential for improving our understanding of alternative fuel effects on combustion performance and environmental impact. The aim of this study is to evaluate the impact of fuel properties and composition on the PM emission characteristics and flame sooty tendency profile on a Rolls-Royce Tay gas turbine combustor. Extractive sampling and in situ measurement methods have been used in this study. A total of 16 types of alternative fuels have been tested under two different operating conditions. PM emissions were measured via a differential mobility spectrometer (DMS 500 fast particulate spectrometer), and the soot propensity profile was analyzed via an innovative visual method based on flame luminosity high-speed imaging. The results indicate that a higher aromatic can be found as the main factor for insufficient burning and greater soot formation. In addition, for fuel properties, the density and surface tension were supposed to be key factors for soot formation. For chemical compositions, fuels with higher cycloparaffin content have the potential to induce soot promotion. In contrast, a fuel with a high hydrogen content can perform in a much more environmentally friendly way. Furthermore, it was observed that the results of PM emission measured by DMS 500 and sooting tendency computed via an imaging method (in situ) correlated particularly well for all of the tested fuels and conditions in this study. The in situ soot emission monitoring method presented in this study can be used for detailed, instantaneous investigation of PM emissions within the combustor. Thus, this method can be considered an alternative evaluation method for measuring qualitative soot emissions.

show abstract

Section: Characteristics Of Eruption Flamesmentioning

confidence: 99%

“…Upon observing each explosion event, it becomes apparent that the explosion is initiated by the spark depicted in Figure 4a, with a rough estimation indicating the explosion center to be within a range of 0.1 to 0.4 m from the safety valve. Based on the theoretical framework outlined in references [21,22], the coloration of the flames exhibits a close correlation with their temperatures, commonly enabling temperature inference through a visual assessment of flame chromaticity. Generally, the With imagery captured at a rate of 240 frames per second, there exists a span of 66 frames between Figure 5a,e, resulting in an explosion cycle duration of 0.275 s. Similarly, employing the same method of calculation enables the determination of a time interval of 0.179 s between Figure 5a,c.…”

Section: Characteristics Of Eruption Flamesmentioning

confidence: 99%

Quantitative Analysis of Lithium-Ion Battery Eruption Behavior in Thermal Runaway

Xing,

Wei,

2024

Batteries

View full text Add to dashboard Cite

With the widespread adoption of battery technology in electric vehicles, there has been significant attention drawn to the increasing frequency of battery fire incidents. However, the jetting behavior and expansion force during the thermal runaway (TR) of batteries represent highly dynamic phenomena, which lack comprehensive quantitative description. This study addresses this gap by employing an enhanced experimental setup that synchronizes the video timing of cameras with a signal acquisition system, enabling the multidimensional quantification of signals, such as images, temperature, voltage, and pressure. It also provides a detailed description of the jetting behavior and expansion force characteristics over time for Li(Ni0.8Co0.1Mn0.1)O2 batteries undergoing thermal runaway in an open environment. The results from three experiments effectively identify key temporal features, including the timing of the initial jetting spark, maximum jetting velocity, jetting duration, explosion duration, and patterns of flame volume variation. This quantitative analytical approach proves effective across various battery types and conditions. The findings could offer scientific foundations and experimental strategies for parameter identification in fire prevention and thermal runaway model development.

show abstract

Investigation of ignition process from visible to infrared by a high speed colour camera

Cited by 25 publications

References 22 publications

Differences in pool-fire induced soot production between subcooled spray and flash boiling spray in a DISI engine

Differences in pool-fire induced soot production between subcooled spray and flash boiling spray in a DISI engine

Effects of Alternative Fuel Properties on Particulate Matter Produced in a Gas Turbine Combustor

Quantitative Analysis of Lithium-Ion Battery Eruption Behavior in Thermal Runaway

Contact Info

Product

Resources

About