Spatiotemporal flame mapping in a large-bore marine diesel engine using multiple high-speed cameras

Hult, Johan; Matamis, Alexios; Baudoin, Eric; Mayer, Stefan; Richter, Mattias

doi:10.1177/1468087419853429

Cited by 8 publications

(3 citation statements)

References 59 publications

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“…10,28 Then the flame propagates upstream and downstream rapidly and exceeds the visible range of 120 mm at 1.70 ms ASOI. The time required for the flame to develop from the ignition position to the boundary is 0.45 ms, that the flame propagation velocity is up to 188 m/s, which is twice to the result estimated by Hult et al 33 in a two-stroke marine diesel engine. The average spray penetration velocity of 8# plume from 0 ms to 1.25 ms is 76 m/s, which is much slower than the flame propagation velocity.…”

Section: Spray and Combustion Behavior With Single-injectionmentioning

confidence: 54%

Experimental investigation on spray and flame characteristics of a marine diesel engine with single and double injection

Liu,

Yang,

Huang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Multiple injection is one of the advanced technologies employed in modern diesel engines to improve combustion efficiency, reduce pollutant emissions, and minimize combustion noise. The application of multiple injection in marine diesel engines differs from its use in vehicles or heavy-duty engines, as it is not commonly combined with Exhaust Gas Recirculation (EGR). However, there is a scarcity of studies specifically examining the combustion characteristics of medium-speed marine diesel engines utilizing multiple injection. Given the large space scale of marine diesel engine, a constant volume chamber with a visible diameter of 240 mm was used, and an injector with a nozzle diameter of 0.465 mm was employed in the experiment. The spray development and combustion process were recorded by Mie-scattering and flame natural luminosity imaging respectively. Both conventional and double injection combustion processes were analyzed in detail. The results show that although the liquid phase spray does not fully penetrate to the cylinder wall in marine diesel engines, the flame penetrates to the cylinder wall rapidly, the flame burns near the wall almost throughout the entire combustion duration. The combustion characteristics of the double injection are significantly different, the flame propagation speed of the pilot and main injection fuel is one-third to one-half of that of a single injection with a long duration. For single injection spray with long injection duration, the flame penetration velocity is determined by the sequential ignition velocity of the fuel. While the flame penetration velocity for sprays with short injection duration mainly depends on the jet penetration velocity. The investigation on the impact of dwell time, fuel distribution, and injection pressure on the combustion process of double injection also provides valuable insights for optimizing multiple injection strategies.

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Section: Spray and Combustion Behavior With Single-injectionmentioning

confidence: 54%

Experimental investigation on spray and flame characteristics of a marine diesel engine with single and double injection

Liu,

Yang,

Huang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…The cylinder bores of marine engines are larger as compared to those in automotive engines. This allows an established spray flame to form prior to flame-wall impingement . Vapor penetrations of the reacting sprays for different d 0 and ρ am are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…This allows an established spray flame to form prior to flame-wall impingement. 36 Vapor penetrations of the reacting sprays for different d 0 and ρ am are shown in Figure 3. The vapor penetration of the associated non-reacting cases is also included to illustrate the increasing difference in time due to the combustion process.…”

Section: Temporal Evolution Ofmentioning

confidence: 99%

Numerical Study of the Influence of Turbulence–Chemistry Interaction on URANS Simulations of Diesel Spray Flame Structures under Marine Engine-like Conditions

Ong

Pang²,

Jangi

et al. 2021

Energy Fuels

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The present work performs Unsteady Reynolds-averaged Navier-Stokes simulations to study the effect of turbulence-chemistry interaction (TCI) on diesel spray flames. Three nozzle diameters (𝑑 0 ) of 100 µm, 180 µm, and 363 µm are considered in the present study. The Eulerian Stochastic Fields (ESF) method (with TCI effect) and Well-Stirred Reactor (WSR) model (without TCI effect) are considered in the present work. The model evaluation is carried out for ambient gas densities (𝜌 𝑎𝑚 ) of 30.0 kg/m 3 and 58.5 kg/m 3 . ESF method is demonstrated to be able to reproduce the ignition delay time (IDT), and lift-off length (LOL) with an improved accuracy than that from the WSR method. Furthermore, TCI has relatively more influence on LOL than on IDT. A normalized LOL (LOL*) is introduced, which considers the effect of 𝑑 0 , and its subsequent effect on the fuel-richness in the rich premixed core region is analyzed. The RO2 distribution is less influenced by the TCI effect as ambient density increases. The ESF model generally predicts longer and wider CH2O distribution. The difference in the spatial distribution of CH2O between the ESF and WSR model diminishes as 𝑑 0 increases. At 𝜌 𝑎𝑚 = 30.0 kg/m 3 , the ESF method results in a broader region of OH with a lower peak OH values than in the WSR case. However, at 𝜌 𝑎𝑚 = 58.5 kg/m 3 , the variation of peak OH value is less susceptible to the increase in 𝑑 0 and the presence of TCI model. Furthermore, the influence of the TCI on the total OH mass decreases as 𝑑 0 increases. The total NOx mass qualitatively follows the same trend as the total OH mass. This present work clearly shows that influence of TCI on the global spray and combustion characteristics becomes less prominent when 𝑑 0 increases.

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CFD analysis of combustion and emission formation using URANS and LES under large two-stroke marine engine-like conditions

Nemati

Ong

Walther

2022

Applied Thermal Engineering

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Spatiotemporal flame mapping in a large-bore marine diesel engine using multiple high-speed cameras

Cited by 8 publications

References 59 publications

Experimental investigation on spray and flame characteristics of a marine diesel engine with single and double injection

Experimental investigation on spray and flame characteristics of a marine diesel engine with single and double injection

Numerical Study of the Influence of Turbulence–Chemistry Interaction on URANS Simulations of Diesel Spray Flame Structures under Marine Engine-like Conditions

CFD analysis of combustion and emission formation using URANS and LES under large two-stroke marine engine-like conditions

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