Process for Study of Micro-pilot Diesel-NG Dual Fuel Combustion in a Constant Volume Combustion Vessel Utilizing the Premixed Pre-burn Procedure

Yang, Xuebin; Vinhaes, Vinicius Bonfochi; Turcios, Marco; McTaggart-Cowan, Gordon; Huang, Jian; Naber, Jeffrey; Shahbakhti, Mahdi; Schmidt, Henry; Atkinson, William

doi:10.4271/2019-01-1160

Cited by 7 publications

(1 citation statement)

References 39 publications

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“…For more conventional injection pressures (>600 bar), very short injection durations are required, especially at part loads. For the same injector as utilized in this study, Yang et al 20 observed that a fully developed spray could be achieved for diesel injection quantities that provide as little as 2% of the total fuel energy at full load; this agrees with similar findings from Zirngibl and Wachtmeister. 21 Maintaining the low diesel energy ratio at lower loads is a substantial challenge due to very small injection quantities requiring short injection durations.…”

Section: Introductionsupporting

confidence: 89%

Development of a medium-duty stoichiometric diesel micro-pilot natural gas engine

Vinhaes

Yang

McTaggart-Cowan

et al. 2022

International Journal of Engine Research

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Fueling a compression-ignition engine with premixed natural gas offers the potential to combine a clean-burning, low-carbon fuel with a high compression ratio, high-efficiency engine. This work describes the development of a multi-cylinder 6.7 L diesel engine converted to run stoichiometric diesel micro-pilot/ natural gas premix combustion with a maximum diesel contribution target of 5% of the total fuel energy and a three-way catalyst aftertreatment system. Results are given by comparing the stoichiometric combustion to the diesel baseline operation, showing combustion characteristics differences, including the rapid two stage heat release. A high load output of 23 bar brake mean effective pressure was obtained with diesel-like brake thermal efficiency of 41%. This operating condition enabled a brake specific CO2 emissions reduction of up to 25% when compared to diesel. It was observed that the low load output is limited by combustion stability when operated at stoichiometric condition. The three-way catalyst is observed to run at peak efficiency with an equivalence ratio of 1.01. Injector fouling was observed through the inspection of the nozzle and its internal parts, indicating carbon build-up similar to that seen in injector coking mechanisms. A comparison of the developed engine to other engine technologies is given, showing that the diesel micro-pilot natural gas engine performance is in good standing among other diesel and gas engines in the market.

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Section: Introductionsupporting

confidence: 89%