An experimental study of the injection strategies on engine performance of the butanol/biodiesel dual-fuel Intelligent Charge Compression Ignition mode

Abstract

Intelligent Charge Compression Ignition (ICCI) combustion mode is a novel dual-fuel combustion strategy that has been proposed recently. In ICCI combustion mode, two fuels with different reactivity are directly injected during the intake stroke and compression stroke, respectively, to achieve flexible reactivity gradient and equivalence ratio stratification. In this study, experiments were conducted on a single-cylinder diesel engine to investigate the effects of butanol direct injection strategies on the engine running with ICCI combustion mode at a constant speed of 1500 r/min and medium load. Results showed that ICCI combustion mode was composed of premixed heat release and diffusion heat release. In compare, the percentage of premixed heat release was higher than the diffusion heat release. With fixed biodiesel direct injection timing (SOI2), retarding butanol single injection timing (SOI1) would delay combustion phasing while not distinctively affect ignition timing. SOI1 showed significant effect on the thermal efficiency and engine emissions. Indicated thermal efficiency (ITE) decreased at first and then slightly increased with retarding of SOI1, while the nitrogen oxides (NOx) emissions were always at low levels. As the butanol second direct injection timing (SOI1-2) retard and the corresponding energy ratio increase, more butanol entered into the crevice/squish regions, leading to the increase of unburned hydrocarbon (HC) and carbon monoxide (CO) emissions. EGR strategy helps to significantly reduce NOx emissions without affecting ITE although penalized HC and CO emissions are resulted in. The optimum butanol direct injection strategies were butanol single direct injection, especially in the early SOI1, in which the thermal efficiency was higher and emissions were at very low levels (NOx < 0.4 g/kW h).

Numerical study of different shape design of piston bowl for diesel engine combustion in a light duty single-cylinder engine

“…As stated in the introduction, a variety of piston bowl shape designs were designed and tested using computational calculations and actual tests to reduce soot and NOx within the squish zone while lowering well heat transfer. Due to the PBSD, which allows for more correct mixing before combustion, more mixing from the piston bowl shape is necessary for the less time DI diesel fuel (Andrey Kuleshov et al., 2014 ; Zhao et al., 2020 ). The purpose of this study was to reduce the NOx and PM by using combustion simulation and compare with each other by using 0.325L engine displacement, single-cylinder diesel engine at AASTU (Addis Ababa Science and Technology University), which has a compression ratio of 24, 4-stroke, and is water-cooled.…”

Experimental investigation of the effect of temperature on ignition of modified kerosene

“…A possible solution to this problem is to modify the specification of fuel by decreasing the total sulphur content allowed. Various experimental methodologies are used for combustion and ignition studies such as constant volume bombs, rapid compression machines, [33][34][35][36][37] Jet-stirred reactors, 38,39 continuous flow reactors 40 and Spray ignition 41 and shock tubes. [41][42][43] Among the methods used to study the ignition of fuels, the shock tube has been a very effective tool and remains an important means of investigation because of improvements in the measurement techniques.…”

Optimization of the exergy efficiency, exergy destruction, and engine noise index in an engine with two direct injectors using NSGA-II and artificial neural network

“…They reported that a retarded injection timing was influential for decreasing NO X , and a more open chamber design showed better results for emissions than the re-entrant ones. Zhao et al 31 carried out an experimental investigation on a butanol/biodiesel light-duty engine operated with a direct dual-fuel injection strategy. Two direct injectors in the combustion chamber were implemented to inject butanol and biodiesel separately and gain the advantage of the RCCI concept.…”