The effect of injection timing and intake valve close timing on performance and emissions of diesel PCCI engine with a full engine cycle CFD simulation

Jia, Ming; Xie, Maozhao; Wang, Tianyou; Peng, Zhijun

doi:10.1016/j.apenergy.2011.03.024

Cited by 135 publications

(40 citation statements)

References 29 publications

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“…Results corroborated the potential from Atkinson cycle for reducing the in-cylinder gas temperature during the compression stroke, but also the gas pressure and its density. According with the results obtained by Jia et al [18], NOx emissions decrease due to the lower temperatures along the combustion process, but the spray mixing process is intrinsically slowed down as a result of the lower gas density. Therefore, the mixing-controlled combustion process deteriorates and soot, CO and fuel consumption increase.…”

Section: Paper Draft: Evaluation Of Massive Egr and Miller Cycle Stramentioning

confidence: 64%

Evaluation of massive exhaust gas recirculation and Miller cycle strategies for mixing-controlled low temperature combustion in a heavy duty diesel engine

Benajes

Molina

Novella

et al. 2014

Energy

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ElsevierMolina Alcaide, SA.; Benajes Calvo, JV.; Novella Rosa, R.; Belarte Mañes, E. (2014). Evaluation of massive exhaust gas recirculation and Miller cycle strategies for mixingcontrolled low temperature combustion in a heavy duty diesel engine. Energy. (71) AbstractThe future of compression ignition engines depends on their ability for keeping their competitiveness in terms of fuel consumption compared to spark-ignition engines. In this competitive framework, the Low Temperature Combustion (LTC) concept is a promising alternative to decrease NOx and soot emissions. Thus, this research focuses on implementing the LTC concept, but keeping the conventional mixing-controlled combustion process to overcome the well-known drawbacks of the highly-premixed combustion concepts, including load limitations and lack of combustion control. Two strategies for implementing the mixing-controlled LTC concept were evaluated. The first strategy relies on decreasing the intake oxygen concentration introducing high rates of cooled EGR. The second strategy consists of decreasing the compression temperature by advancing the intake valves closing angle to reduce the effective compression ratio, compensating the air mass losses by increasing boost pressure (Miller cycle). These strategies were tested in a singlecylinder heavy-duty research engine. Additionally, 3D-CFD modeling was used to give insight into local in-cylinder conditions during the injection-combustion process. Results confirm the suitability of both strategies for reducing NOx and soot emissions, while their main drawback is the increment in fuel consumption. However, they present intrinsic differences in terms of local equivalence ratios and temperatures along combustion.

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Section: Paper Draft: Evaluation Of Massive Egr and Miller Cycle Stramentioning

confidence: 64%

Evaluation of massive exhaust gas recirculation and Miller cycle strategies for mixing-controlled low temperature combustion in a heavy duty diesel engine

Benajes

Molina

Novella

et al. 2014

Energy

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“…These limitations necessities modification in engine operating parameters in order to avail the advantages associated with biodiesel application. There are many studies which show the potential for optimizing engine operating parameters for effective utilization of biodiesel in conventional diesel engines with the help of performance, combustion and emission analysis in short duration tests [45][46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of endurance characteristics for a modified diesel engine runs on jatropha biodiesel

Kumar¹,

Varun

Chauhan

2015

Applied Energy

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“…Unlike the conventional diesel combustion, PCCI combustion uses early injections and relatively higher exhaust gas recirculation (EGR) rates for simultaneously reducing NO x and soot emissions levels. However, many problems such as mixture preparation and control of the combustion phasing [9], together with knock, can damage the engine and generate annoying noise [10]. These characteristics complicate the application of this type of combustion.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of combustion noise and NOx and soot emissions to pilot injection in PCCI Diesel engines

et al. 2013

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Diesel engines are the most commonly used internal combustion engines nowadays, especially in European transportation. This preference is due to their low consumption and acceptable driveability and comfort. However, the main disadvantages of traditional direct injection Diesel engines are their high levels of noise, nitrogen oxides (NO x ) and soot emissions, and the usage of fossil fuels. In order to tackle the problem of high emission levels, new combustion concepts have been recently developed. A good example is the premixed charge compression ignition (PCCI) combustion, a strategy in which early injections are used, causing a burning process in which more fuel is burned in premixed conditions, which affects combustion noise. The use of a pilot injection has become an effective tool for reducing combustion noise. The main objective of this paper is to analyze experimentally the pollutant emissions, combustion noise, and performance of a Diesel engine operating under PCCI combustion with the use of a pilot injection. In addition, a novel methodology, based on the decomposition of the in-cylinder pressure signal, was used for combustion noise analysis. The results show that while the PCCI combustion has potential to reduce significantly the NO x and soot emission levels, compared to conventional Diesel combustion strategy, combustion noise continues to be a critical issue for the implementation of this new combustion concept in passenger cars.

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The effect of injection timing and intake valve close timing on performance and emissions of diesel PCCI engine with a full engine cycle CFD simulation

Cited by 135 publications

References 29 publications

Evaluation of massive exhaust gas recirculation and Miller cycle strategies for mixing-controlled low temperature combustion in a heavy duty diesel engine

Evaluation of massive exhaust gas recirculation and Miller cycle strategies for mixing-controlled low temperature combustion in a heavy duty diesel engine

Evaluation of endurance characteristics for a modified diesel engine runs on jatropha biodiesel

Sensitivity of combustion noise and NOx and soot emissions to pilot injection in PCCI Diesel engines

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