Fundamental Spray and Combustion Measurements of JP-8 at Diesel Conditions

Pickett, Lyle M.; Hoogterp, Laura

doi:10.4271/2008-01-1083

Cited by 76 publications

(69 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The red symbol in Figure 5, points out the penetration result extracted from the processed contour of the image labeled as "a". With the LRT code, detected contours are biased towards shorter penetration measurements; while the texture code produces a more accurate contour, which results in a tip penetration evolution closer to typical measurements [13,17,19,20,26].…”

Section: Processing Routinesmentioning

confidence: 99%

“…Furthermore, when looking into the described trends of reacting tip penetration compared to the inert one, results are somewhat non-consistent. By means of shadowgraphy, Picket et al in [19] have reported reacting spray results that penetrated slightly faster than the inert one. Moreover, the same author in [20] using the same optical setup but adding a schlieren cut-off (which are not used in shadowgraphy imaging) reported that the reacting spray progressed slightly more slowly than the inert case.…”

Section: Introductionmentioning

confidence: 99%

“…blooming phenomenon [21] or unusual histogram distributions [22], which limit or at least introduce uncertainty when systematic measurements are performed. Therefore, when considering the discrepancies among configurations from different authors (schlieren sensitivity, interfering soot luminosity and processing tools), it might seem reasonable that the corresponding reacting tip penetration trends may not fully agree [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Schlieren Methodology for the Analysis of Transient Diesel Flame Evolution

Pastor¹,

Payri²,

García-Oliver³

et al. 2013

SAE Int. J. Engines

View full text Add to dashboard Cite

Schlieren/shadowgraphy has been adopted in the combustion research as a standard technique for tip penetration analysis of sprays under diesel-like engine conditions. When dealing with schlieren images of reacting sprays, the combustion process and the subsequent light emission from the soot within the flame have revealed both limitations as well as considerations that deserve further investigation. Seeking for answers to such concerns, the current work reports an experimental study with this imaging technique where, besides spatial filtering at the Fourier plane, both short exposure time and chromatic filtering were performed to improve the resulting schlieren image, as well as the reliability of the subsequent tip penetration measurement. The proposed methodology has reduced uncertainties caused by artificial pixel saturation (blooming). Additionally, an algorithm to calculate Lift-off length from schlieren images has been developed and compared to the more conventional OH* imaging technique.By means of the improved setup, the analysis of transient diesel flame has been performed throughout the ignition and early combustion phases. When compared to a non-reacting vaporizing spray, the temporal evolution of the reacting case departs from the inert one at the start of combustion, when expansion in both axial (i.e. spray tip increase) and radial direction are observed. After that, the tip penetration progressively decreases on a clear transient period where the flow tries to re-organize itself in response to the induced reaction zone. Eventually, the spray undergoes an acceleration period where the reacting spray tip progresses above the nonreacting one. A parametric study has been conducted for three injection pressure levels to investigate the influence of this parameter upon transient flame evolution.

show abstract

Section: Processing Routinesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Schlieren Methodology for the Analysis of Transient Diesel Flame Evolution

Pastor¹,

Payri²,

García-Oliver³

et al. 2013

SAE Int. J. Engines

View full text Add to dashboard Cite

show abstract

“…Different experimental results show that sometimes there is a clearly faster penetration, while in other cases differences between inert and reacting spray tip evolution are within the experimental uncertainty. Given the fact that different schlieren optical arrangements were used in previous investigations [18][19][20][21], a question can be raised as to how strong the influence of the setup on the results can be or, if this behavior is mainly dependent on the operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Pickett and Hoogterp [20] investigated reactive spray penetration with schlieren imaging under moderate EGR conditions (15%O 2 ; 22.8 kg/m 3 ambient density and 900 K ambient temperature) for a 1.5ms injection event. Similar trends were observed during the autoignition and later penetration phases as reported by Siebers in [19].…”

Section: Introductionmentioning

confidence: 99%

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Desantes

Pastor

García-Oliver

et al. 2014

Combustion and Flame

View full text Add to dashboard Cite

Schlieren imaging has helped deeply characterize the behavior of diesel spray when injected into an oxygen-free ambient. However, when considering the transient penetration of the reacting spray after autoignition, i.e. the Diesel flame, few studies have been found in literature. Differences among optical setups as well as among experimental conditions have not allowed clear conclusions to be drawn on this issue. Furthermore, soot radiation may have a strong effect on the image quality, which cannot be neglected.The present paper reports an investigation on the transient evolution of Diesel flame based upon schlieren imaging. Experimental conditions have spanned values of injection pressure, ambient temperature and density for typical Diesel engine conditions. An optimized optical setup has been used, which makes it possible to obtain results without soot interference. Based on observations for a long injection event (4 ms Energizing Time), the analysis has resorted to extensive comparison of inert and reacting sprays parameters, which have made it possible to define different phases after autoignition.Shortly after autoignition, axial and radial expansion of the spray have been observed in terms of axial penetration and radial cone angle. After that, during a stabilization phase, the reacting spray penetrates at a similar rate as the inert one. Later, the reacting spray undergoes an acceleration period, where it penetrates at a faster rate than the inert one. Finally, the flame enters a quasi-steady penetration phase, where the ratio of reacting and inert penetration stabilizes at a nearly constant value. The duration of the reacting spray penetration stages shows modifications when varying engine parameters such as air temperature, air density, injection pressure, and nozzle diameter. However, the proportionality between reacting and inert penetration has been observed to depend mainly on temperature, in agreement with observed reductions in entrainment when shifting from inert to reacting conditions.

show abstract

Improving Heavy Duty Vehicles Fuel Consumption with Density and Friction Modifier

Zöldy

2019

Int.J Automot. Technol.

View full text Add to dashboard Cite

Fundamental Spray and Combustion Measurements of JP-8 at Diesel Conditions

Cited by 76 publications

References 13 publications

Schlieren Methodology for the Analysis of Transient Diesel Flame Evolution

Schlieren Methodology for the Analysis of Transient Diesel Flame Evolution

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Improving Heavy Duty Vehicles Fuel Consumption with Density and Friction Modifier

Contact Info

Product

Resources

About