Study on dual fuel combustion in an optical research engine by infrared diagnostics varying methane quantity and engine speed

Mancaruso, Ezio; Todino, Michele Domenico; Vaglieco, Bianca Maria

doi:10.1016/j.applthermaleng.2020.115623

Cited by 14 publications

(2 citation statements)

References 25 publications

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“…The study found that increasing the pilot diesel quantity can enhance the initial heat release, expand the range of initial flame kernel distribution, and improve the combustion speed. In addition to the aforementioned methods, researchers have also employed endoscopic techniques or infrared imaging principles to study flame imaging phenomena during the diesel ignition of natural gas [37,38].…”

Section: Introductionmentioning

confidence: 99%

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Tian,

Cui,

Xiao

et al. 2023

Processes

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Pilot diesel ignition is an effective approach for achieving efficient and clean combustion of natural gas. In this study, a rapid compression and expansion machine (RCEM) was constructed for examining diesel-ignited premixed methane combustion. The effects of the methane equivalence ratio and pilot diesel mass on the combustion process of diesel-ignited premixed methane gas were investigated. The results show that the combustion process can be divided into two stages: diesel dominance and premixed methane combustion. An increase in the methane equivalence ratio inhibits diesel combustion, leading to delayed CA10 and OH radical generation. However, it enhances premixed methane flame propagation and improves the heat release rate, resulting in a shorter combustion duration. An increase in the pilot diesel mass contributes to a larger flame area and higher OH generation intensity in the ignition region; however, too large a diesel mass inhibits methane flame propagation towards the diesel nozzle due to an extended injection duration. In conclusion, a larger pilot diesel mass can achieve better overall combustion performance, but excessive amounts may be counterproductive.

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Section: Introductionmentioning

confidence: 99%

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Tian,

Cui,

Xiao

et al. 2023

Processes

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“…36,37 Note that the infrared imaging has been applied more extensively to combustion diagnostics than to thermography in recent engine and engine-equivalent studies. [38][39][40] For either of combustion or thermography diagnostics, crank-angle resolved diagnostics indeed requires a high-speed imaging device. The imaging of the infrared emissions from the combustion products is relatively simple of itself, only requiring infraredcompatible optical engine or vessel, optics and the camera.…”

Section: Introductionmentioning

confidence: 99%

Infrared high-speed thermography of combustion chamber wall impinged by diesel spray flame

Aizawa

Kinoshita

Akiyama

et al. 2021

International Journal of Engine Research

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As a demonstration of a new method to examine the extremely unsteady and spatially varying wall heat transfer phenomena on diesel engine combustion chamber wall, high-speed imaging of infrared thermal radiation from the wall surface impinged by a diesel spray flame was attempted using a high-speed infrared camera. A 35 mm-diameter chromium-coated quartz window surface was impinged by a diesel spray flame with an impinging distance of 27 mm from the nozzle orifice in a constant volume combustion chamber. The infrared thermal radiation from the back surface of the 0.6 µm thick chromium layer was successfully visualized at 10 kHz frame rate and 128 × 128 pixel resolution through the quartz window. The infrared radiation exhibited coherent and streaky structure with radial stripes extending and waving from the stagnation point. The width of the radial stripes, spatial amplitude and the period of the waving movement were comparable to the ones for turbulent heat transfer on the engine cylinder wall previously measured with a heat flux sensor, suggesting that they are resulting from the turbulent structure in the wall-impinging diesel flame. The radiation intensity was calibrated to temperature and converted to heat flux via 3-D numerical analysis of transient thermal conduction in the quartz window. The peak-to-peak variation amplitudes of temperature and heat flux among the radial stripes during the diesel spray flame impingement were about 20 K and 2.3 MW/m2, corresponding to 13% of 150 K maximum temperature swing amplitude and 18 MW/m2 maximum heat flux, respectively.

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Understanding Combustion in CI Engines for Adoption of Renewable Fuels

Jena

Ágarwal

2023

Energy, Environment, and Sustainability

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Study on dual fuel combustion in an optical research engine by infrared diagnostics varying methane quantity and engine speed

Cited by 14 publications

References 25 publications

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Infrared high-speed thermography of combustion chamber wall impinged by diesel spray flame

Understanding Combustion in CI Engines for Adoption of Renewable Fuels

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