Gradient effects on two-color soot optical pyrometry in a heavy-duty DI diesel engine

Musculus, Mark P.; Singh, Satbir; Reitz, Rolf D.

doi:10.1016/j.combustflame.2007.10.023

Cited by 81 publications

(51 citation statements)

References 24 publications

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“…Similar arguments can be found in Musculus et al [23] when comparing CFD calculations and 490 experimental measurements of integrated radiation from the whole combustion chamber. 491…”

supporting

confidence: 75%

Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions

Pastor

García-Oliver

García

et al. 2016

Combustion and Flame

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Mico Reche, C. (2016). Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions. Combustion and Flame. 164:212-223. doi:10.1016/j.combustflame.2015.11.018. Nevertheless, it could still be a good option for low sooting conditions. On the other hand, an 36 attempt to calibrate LII signal by means of LEM measurements has been reported. This approach 37 should make it possible to obtain additional information on the soot spatial distribution. 38 However, inconsistencies have been identified which stem from the inherent limitations of LII 39 technique in highly sooting conditions. 40 Application of optical diagnostics to the quantification of soot in

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“…Similar arguments can be found in Musculus et al [23] when comparing CFD calculations and 490 experimental measurements of integrated radiation from the whole combustion chamber. 491…”

supporting

confidence: 75%

Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions

Pastor

García-Oliver

García

et al. 2016

Combustion and Flame

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“…Since the results measured by two-color method are the integrated value along the line of sight, the effect of spatial gradients of soot properties within the measurement volume were analyzed [51].…”

Section: Two-color Methodsmentioning

confidence: 99%

Review of soot measurement in hydrocarbon-air flames

Lou

Chen

Sun

et al. 2010

Sci. China Technol. Sci.

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Soot, which is produced in fuel-rich parts of flames as a result of incomplete combustion of hydrocarbons, is the No. 2 contributor to global warming after carbon dioxide. Developing soot measurement techniques is important to understand soot formation mechanism and control soot emission. The various soot measurement techniques, such as thermophoretic sampling particles diagnostics followed by electron microscopy analysis, thermocouple particle densitometry, light extinction, laser-induced incandescence, two-color method, and emission computed tomography, are reviewed in this paper. The measurement principle and application cases of these measurement methods are described in detail. The development trend of soot measurement is to realize the on-line measurement of multi-dimensional distributions of temperature, soot volume fraction, soot particle size and other parameters in hydrocarbon-air flames. Soot measurement techniques suitable for both small flames in laboratories and large-scale flames in industrial combustion devices should be developed. Besides, in some special situations, such as high-pressure, zero gravity and micro-gravity flames, soot measurement also should be provided. hydrocarbon-air flames, combustion measurement, soot, laser-induced incandescence, emission CT Citation:Lou C, Chen C, Sun Y P, et al. Review of soot measurement in hydrocarbon-air flames.

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“…A detailed description of the two-color pyrometry method can be found in [19]. Thus, pyrometry can be performed by using two different strategies; two dimensionally using a fast sampling high-speed camera [20] [21] or zero dimensionally based on a collecting lens and an optical fiber in combination with a photo diode [14]. The first method provides spatial and temporal resolution of soot temperature and KL.…”

Section: Introductionmentioning

confidence: 99%

In-cylinder soot radiation heat transfer in direct-injection diesel engines

Benajes

Martín

García

et al. 2015

Energy Conversion and Management

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HIGHLIGHTSOptoelectronic pyrometer provides similar results compared with a conventional method Lower injection pressure results in higher radiation Higher ambient temperature and higher in-cylinder gas density produce higher radiation Larger lift-off length reduces the soot volume fraction and the spectral intensity An increase on swirl number, load and CA50 provide a lower total radiation Lower values of EGR implies a decreased on radiation intensity KEYWORDSSoot; in-cylinder heat transfer; radiation; Optical pyrometer; ABSTRACTThe efficiency and CO 2 are one of the main concerns of automotive manufacturers.There are several strategies under investigation to solve this problem. In the present work, the research effort has been focused on improving knowledge of in-cylinder heat transfer and its impact on engine efficiency. In particular, soot radiation was studied since it can be considered a significant source of the efficiency losses in modern diesel engines. Considering previous studies, the portion of total chemical energy released during combustion lost due to radiation heat transfer varies widely from 0.5 up to 10%, depending on engine parameters and combustion process. Thus, the main objective of this work was to evaluate the amount of energy lost to soot radiation relative to the input fuel chemical energy during the combustion event under different operating conditions in a completely controlled environment provided by an optical engine. Under these simplified conditions, two-color method was applied by using high speed imaging pyrometer with cameras (two dimensional results) and optoelectronic pyrometer (zero dimensional results). Once a detailed comparison between both diagnostics was performed, optoelectronic pyrometer was used to characterize radiant energy losses in a fully instrumented 4-cylinder direct-injection light-duty diesel engine. In particular swirl ratio, EGR and combustion phasing effects on radiation heat transfer were evaluated.

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Gradient effects on two-color soot optical pyrometry in a heavy-duty DI diesel engine

Cited by 81 publications

References 24 publications

Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions

Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions

Review of soot measurement in hydrocarbon-air flames

In-cylinder soot radiation heat transfer in direct-injection diesel engines

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