Impact of pilot diesel ignition mode on combustion and emissions characteristics of a diesel/natural gas dual fuel heavy-duty engine

Wang, Zhongshu; Zhao, Zhen; Wang, Dan; Tan, Mao; Han, Yingbo; Liu, Zhongchang; Dou, Hongwei

doi:10.1016/j.fuel.2015.11.077

Cited by 138 publications

(46 citation statements)

References 30 publications

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“…In addition, the HRR was calculated using the average in-cylinder pressure of 100 continuous operating cycles according to equation (3), which is based on the first law of thermodynamics…”

Section: Experimental Process and Conditionsmentioning

confidence: 99%

“…However, the diesel-piloted NG engine still present some disadvantages, such as the high emissions of hydrocarbons (HC) and carbon monoxide (CO) under low loads that result from incomplete combustion and high cyclic variations due to unstable combustion at high loads. 6,12 Various strategies, such as exhaust gas recirculation (EGR), 16,17 throttle technology, 18 pilot injection timing, 3,19,20 and the pilot fuel quantity, 12,14,21,22 are used to overcome these obstacles. Incomplete combustion is the primarily cause of an over-lean air/NG mixture in the cylinder at low loads.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the substitution rate of natural gas on the combustion and emission characteristics in a dual-fuel engine under full load

Lyu

Zhang

Bao

et al. 2017

Advances in Mechanical Engineering

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Diesel-piloted natural gas has been considered one of the most promising methods of using natural gas in a compression-ignition engine with few modifications, as this approach benefits from a high thermal efficiency resulting from a high compression ratio. This study experimentally investigated the impact of the natural gas substitution rate on the characteristics of combustion and emissions. Tests were performed under full-load operating conditions at a fixed speed of 1200 r/min with optimized injection timing, and the substitution rate of natural gas was varied with the fixed total fuel energy for different analyses. The in-cylinder pressure, pressure rise rate, heat release rate, cyclic variation of the maximum cylinder pressure (P max ) and emissions of HC, CO, NO x , and smoke were analyzed. The results indicate that P max and the maximum pressure rise rate initially increase and then decrease as the substitution rate of natural gas increases, whereas the heat release rate and standard deviation of P max increase. Moreover, HC and CO increase as the substitution rate of natural gas increases, whereas NO x and smoke emissions exhibit a trade-off trend.

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“…In addition, the HRR was calculated using the average in-cylinder pressure of 100 continuous operating cycles according to equation (3), which is based on the first law of thermodynamics…”

Section: Experimental Process and Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the substitution rate of natural gas on the combustion and emission characteristics in a dual-fuel engine under full load

Lyu

Zhang

Bao

et al. 2017

Advances in Mechanical Engineering

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“…Currently, gas engines for motor vehicles with the gross weight of more than 3.5 t are being built on a diesel basis, because there are no gasoline engines with spark ignition of such displacement, which could be used as a base for conversion [11].…”

Section: Introductionmentioning

confidence: 99%

Prospects for energy efficiency improvement and reduction of emissions and life cycle costs for natural gas vehicles

Kozlov

Теренченко

Luksho

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. This work is devoted to the experimental investigation of the possibilities to reduce greenhouse gas emissions and to increase energy efficiency of engines that use natural gas as the main fuel and the analysis of economic efficiency of use of dual fuel engines in vehicles compared to conventional diesel. The results of experimental investigation of a 190 kW dualfuel engine are presented; it is shown that quantitative and qualitative working process control may ensure thermal efficiency at the same level as that of the diesel engine and in certain conditions 5...8% higher. The prospects for reduction of greenhouse gas emissions have been assessed. The technical and economic evaluation of use of dual fuel engines in heavy-duty vehicles has been performed, taking into account the total life cycle. It is shown that it is possible to reduce life cycle costs by two times.

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“…This has its implications on gas-diesel dual fuel engines, as the combustion mode in these engines is essentially dependent on pilot injection strategy and its subsequent ignition mode [2]. Conventional DDF combustion mode is attained through using a single injection of the diesel pilot, late in the compression stroke, to act as an ignition source for the premixed gaseous fuel-air mixture.…”

Section: Introductionmentioning

confidence: 99%

“…Reactions in HCCI engines generally involve a two-stage process, including the so-called low temperature and high temperature reactions. For dual-fuel HCCI combustion, the two-stage process is different from those of diesel-like or gasoline-like fuel HCCI combustion and still unclear up to now, but the general features are analogous [2]. The combustion starts with low temperature reactions (LTR) of diesel pilot, or a cool flame zone, that has a high degree of reactivity owing to a high level or radicals [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Pilot Pre-Injection Mass on Partially Premixed Dual Fuel (PPDF) Engine Combustion

Hegab¹,

Shayler²

2017

World Congress on Momentum, Heat and Mass Transfer

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-The development of advanced techniques of diesel engines brings many novel ideas to dual fuel engines, where the key to combustion mode change is essentially the optimization of the pilot injection strategy. Splitting the diesel pilot into a main injection preceded by a pre-injection could bring about a change in the combustion mode from the conventional diesel dual fuel (DDF) combustion to the novel partially premixed dual fuel (PPDF) combustion; if the pre-injection part of the pilot is optimized for timing and quantity. In diesel engines with split injection, the pre-injection part is set to a certain percentage of the total diesel fuel supplied to the engine at the particular operating condition. This could be challenging to PPDF combustion, where the relative proportions of gaseous fuel and diesel could change at the same power level produced. With high levels of gaseous fuel substitution, the mass of diesel pre-injection could drop substantially and potentially lose its effect. The present work aims at investigating the influence of pilot pre-injection mass on PPDF combustion and performance at part load conditions. A comparative study was conducted on a modern automotive direct injection (DI) diesel engine working on PPDF with methane and diesel, between two pre-injection strategies; namely the fixed ratio (FR) and the fixed mass (FM). The tests were performed at different engine speeds ranging from 1400 to 2000 rpm at 25% of the engine load at the particular speed, with different substitution ratios of methane for diesel fuel (from 20 to 80% on energy basis). Cylinder pressure, rate of pressure rise (ROPR), coefficient of variation of gross IMEP (COVIMEPgross), heat release rate (HRR), combustion phasing (CA50), brake thermal efficiency, total equivalence ratio, and total diesel fuel injected; are all studied and compared for both pilot pre-injection strategies.

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Impact of pilot diesel ignition mode on combustion and emissions characteristics of a diesel/natural gas dual fuel heavy-duty engine

Cited by 138 publications

References 30 publications

Effects of the substitution rate of natural gas on the combustion and emission characteristics in a dual-fuel engine under full load

Effects of the substitution rate of natural gas on the combustion and emission characteristics in a dual-fuel engine under full load

Prospects for energy efficiency improvement and reduction of emissions and life cycle costs for natural gas vehicles

Influence of Pilot Pre-Injection Mass on Partially Premixed Dual Fuel (PPDF) Engine Combustion

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