Experimental and numerical study of lift-off length and ignition delay of a two-component diesel surrogate

Payri, Raúl; Viera, Juan P.; Pei, Yuanjiang; Som, Sibendu

doi:10.1016/j.fuel.2014.11.072

Cited by 50 publications

(59 citation statements)

References 42 publications

(68 reference statements)

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“…Experimental results by multiple authors [27,29,[31][32][33][34] have shown the e ect of oxygen concentration, ambient temperature, density and injection pressure on ignition delay. As theoretically explained by Petrucci et al [35], increasing oxygen concentration and ambient temperature accelerate oxidation reactions, resulting in a reduction in ignition delay.…”

Section: Impact Of Operating Conditions On Ignition Delaymentioning

confidence: 99%

Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector

et al. 2016

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Elsevier Payri, R.; Salvador Rubio, FJ.; Viera Sotillo, AA. (2016). Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector. Applied Energy. 162:541-550. doi:10.1016Energy. 162:541-550. doi:10. /j.apenergy.2015 Raúl Payri, F.J. Salvador, Julien Manin, Alberto Viera; Diesel ignition delay and li -o length through di erent methodologies using a multi-hole injector. Applied Energy, 2015, 162, 541-550. Diesel ignition delay and li -o length through di erent methodologies using a multi-hole injector AbstractIn this paper, li -o length has been measured via both broadband luminosity and OH chemiluminescence. In addition, ignition delay has also been measured via broadband chemiluminescence and Schlieren imaging. A 3 ori ce injector from the Engine Combustion Network (ECN) set, referred to as Spray B, and a single component fuel (n-dodecane) was used. Experiments were carried out in a constant ow and pressure facility, that allowed to reproduce engine-like thermodynamic conditions, and enabled the study to be performed over a wide range of test conditions with a very high repetition rate. Data obtained was also compared with results from a single ori ce injector also from the Engine Combustion Network, with analog ori ce characteristics (90 micrometer outlet diameter and convergent shape) and technology as the injector used . Results showed that there is good correlation between the ignition delay measured through both methodologies, that oxygen concentration and injection pressure plays a minor role in the ignition delay, being ambient temperature and density the parameters with the highest in uence. Li -o length measurements showed signi cant di erences between methodologies. Minor deviation was observed between injectors with di erent nozzle geometry (seat inclination angle), due to temperature variations along the chamber, highlighting the importance of temperature distribution along combustion vessels. Empirical correlations for li -o and ignition delay were calculated, underlining the e ect of the conditions on the parameters studied. Coe cients of the correlations were compared with results for the single ori ce injector, this showed that variations of test conditions have the same impact on ignition delay and li -o length regardless the nozzle ori ce con guration.

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Section: Impact Of Operating Conditions On Ignition Delaymentioning

confidence: 99%

Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector

et al. 2016

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“…Specifically, the chemiluminescence of OH ⁄ is a technique widely used in combustion investigation [14,16,15], in which OH ⁄ radicals are emitted when they decay at their ground state and the generated luminescence can be captured to several diagnostics as the detection of high-temperature regions or estimations of the equivalence ratio [19]. In this connection, before going further in the technique explanation, it is pertinent to define the ignition parameter that was characterized in this work using OH ⁄ chemiluminescence method: the lift-off length.…”

Section: Oh ⁄ Chemiluminescencementioning

confidence: 99%

“…and inert sprays penetrations [12,13], determining generally the faster spray expansion in presence of combustion. This technique has been also employed for ignition delay measurements under the knowledge of the light intensity characteristics of each combustion phase [14,15]. Furthermore, several authors have underlined the effect of air-fuel mixture on soot formation, which can be associated with lift-off length [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the injection conditions influence over n-dodecane and diesel sprays with two ECN single-hole nozzles. Part II: Reactive atmosphere

Payri

Salvador

Gimeno

et al. 2016

Energy Conversion and Management

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a b s t r a c tThe second part of this experimental analysis, presented in this paper, seeks to go deep on the characterization of the Spray C and Spray D nozzles from the Engine Combustion Network, investigating the penetration of fuel spray at reacting conditions alongside characteristic parameters of combustion such as ignition delay and lift-off length. Both ECN mono-orifice injectors have similar nozzle flow capacity but different conicity degrees and corner sharpness, being Spray C more susceptible to cavitate. Schlieren imaging technique was employed to quantitatively measure reactive penetration and ignition delay, while lift-off length was identified through OH ⁄ chemiluminescence. As in the inert part of this research, n-dodecane and commercial diesel were selected for the tests, thereby the effect of the fuel properties in the measured parameters was analyzed. Also, once again the concept of R-parameter, defined as the penetration derivative respect to the square root of time was calculated to delve into the penetration behavior. The experiments were performed in a constant pressure-flow facility able to reproduce engine-like thermodynamic conditions. Results revealed that R-parameter evolution can be divided in four stages: an inert zone, a 'bump', a 'valley' part and a quasi-steady one that overlaps the previous inert part. Those stages are highly governed by ambient temperature and oxygen concentration. Nozzle geometry and fuel properties demonstrated to have a noteworthy influence on all measured parameters.

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“…An additional explanation is found in the higher injection pressure directly after needle lift. Payri et al [71] have shown in their experiments and simulations that the FLOL increases slightly with injection pressure.…”

Section: Flame Lift Off Lengthmentioning

confidence: 97%

Spray Combustion Analysis of Humins

Feijen¹,

Klink

Jong

et al. 2017

SAE Technical Paper Series

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Second generation biomass is an attractive renewable feedstock for transport fuels. Its sulfur content is generally negligible and the carbon cycle is reduced from millions to tens of years. One hitherto non-valorized feedstock are so-called humins, a residual product formed in the conversion of sugars to platform chemicals, such as hydroxymethylfurfural and methoxymethylfurfural, intermediates in the production of FDCA, a building block used to produce the polyethylene furanoate (PEF) bottle by Avantium.The focus of this study is to investigate the spray combustion behavior of humins as a renewable alternative for heavy fuel oil (HFO) under large two-stroke engine-like conditions in an optically accessible constant volume chamber. To reduce the viscosity to HFO levels of the otherwise crystalline humins, methyl levulinate (ML), another side-stream from the same sugar dehydration process, is blended to the former compound at 25 wt.-%; a ratio comparable to that actually produced in many dehydration processes.Various fuel properties of interest, including elemental composition, heating value, density, ignition quality, acid number, flash point, pour point, carbon residue, sediment, water and ash content are measured for the resulting humins-ML blend.The blend is injected into an optically accessible constant volume chamber, the dimensions, injector characteristics and prevailing ambient conditions of which are representative of those found in large two-stroke marine engines. Commercial HFO is used as a benchmark.The combustion process is evaluated by means of shadow imaging and OH*-chemiluminescence. The former and latter optical techniques are used to determine the phasing and overall magnitude of the heat release event, and ignition delay/location and flame lift off length, respectively.From the results becomes clear that the average ignition delay is comparable to that of HFO, albeit at a higher cycle-to-cycle variation. Notwithstanding a longer lift off length and more downstream ignition kernels, the overall results suggest that the proposed bioblend is a feasible renewable alternative for HFO in terms of technical feasibility.

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Experimental and numerical study of lift-off length and ignition delay of a two-component diesel surrogate

Cited by 50 publications

References 42 publications

Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector

Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector

Experimental study of the injection conditions influence over n-dodecane and diesel sprays with two ECN single-hole nozzles. Part II: Reactive atmosphere

Spray Combustion Analysis of Humins

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