Quantitative Spatially Resolved Measurements of Total Radiation in High-Pressure Spray Flames

Skeen, Scott A.; Manin, Julien; Pickett, Lyle M.; Dalen, Kristine; Ivarsson, Anders

doi:10.4271/2014-01-1252

Cited by 24 publications

(36 citation statements)

References 28 publications

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“…This result agrees with recent measurements by Skeen 470 et al [39], where the ratio between KL as derived from LEM and spectral radiation 471 measurements range from 1.5 at the highest temperature to 5 at the lowest temperature. Some 472 explanation can be found by using the radiation propagation model.…”

supporting

confidence: 83%

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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supporting

confidence: 83%

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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“…Skeen [15] has presented results in a combustion vessel using an injector with single hole nozzle of 90 µm nominal diameter, n-dodecane as fuel under ECN spray conditions (1500 bar; X O2 = 15%; ρ = 22.8 kg/m 3 ) and sweeping the ambient temperature. Thus, some operating conditions are quite similar to the ones presented in this research.…”

Section: Figure 14: Radiant Fraction A) Effect Of Different Injectionmentioning

confidence: 99%

“…Thus, as in Musculus [38] and Skeen [15], the radiant fraction, X rad , is defined as the fraction of the total chemical energy released during injection that is lost due to radiation heat transfer. This is expressed as: (7) where m f represents the mass of fuel injected and Q LHV is the lower heating value of 30% Decane and 70% Hexadecane (43995 KJ/Kg).…”

Section: Calculation Of Radiant Fractionmentioning

confidence: 99%

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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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“…Thus, as in Musculus [35] and Skeen [13], the radiant fraction, Xrad, is defined as the fraction of the total chemical energy released during injection that is lost due to radiation heat transfer. This is expressed as:…”

Section: Radiant Fractionmentioning

confidence: 99%

An Investigation of Radiation Heat Transfer in a Light-Duty Diesel Engine

Benajes¹,

Martín²,

García³

et al. 2015

SAE Int. J. Engines

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In the last two decades engine research has been mainly focused on reducing pollutant emissions. This fact together with growing awareness about the impacts of climate change are leading to an increase in the importance of thermal efficiency over other criteria in the design of internal combustion engines (ICE). In this framework, the heat transfer to the combustion chamber walls can be considered as one of the main sources of indicated efficiency diminution. In particular, in modern direct-injection diesel engines, the radiation emission from soot particles can constitute a significant component of the efficiency losses. Thus, the main of objective of the current research was to evaluate the amount of energy lost to soot radiation relative to the input fuel chemical energy during the combustion event under several representative engine loads and speeds. Moreover, the current research characterized the impact of different engine operating conditions on radiation heat transfer. For this purpose, a combination of theoretical and experimental tools were used. In particular, soot radiation was quantified with a sensor that uses two-color thermometry along with its corresponding simplified radiation model. Experiments were conducted using a 4-cylinder direct-injection light-duty diesel engine fully instrumented with thermocouples. The goal was to calculate the energy balance of the input fuel chemical energy.Results provide a characterization of radiation heat transfer for different engine loads and speeds as well as radiation trends for different engine operating conditions.

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Quantitative Spatially Resolved Measurements of Total Radiation in High-Pressure Spray Flames

Cited by 24 publications

References 28 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

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

An Investigation of Radiation Heat Transfer in a Light-Duty Diesel Engine

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