Experimental investigation the effects of Miller cycle coupled with asynchronous intake valves on cycle-to-cycle variations and performance of the SI engine

Qiao, Junhao; Liu, Jingping; Liang, Jian; Jia, Dongdong; Wang, Rumin; Shen, Dazi; Duan, Xiongbo

doi:10.1016/j.energy.2022.125868

Cited by 9 publications

(3 citation statements)

References 41 publications

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“…(M15) have been successfully tested in a number of large fleets in years of road testing. 123 M15 was chosen by automakers as the limiting percentage of methanol that could be used in an existing fleet with little or no change in vehicle performance and materials used in vehicle fuel systems. In general, properly blended M15 fuel with appropriate levels of cosolvents (for low temperature phase stability) and corrosion inhibitors provides satisfactory performance.…”

Section: Market Development Trends and Qualitymentioning

confidence: 99%

“…Mixtures of methanol with a concentration of 15% vol. (M15) have been successfully tested in a number of large fleets in years of road testing . M15 was chosen by automakers as the limiting percentage of methanol that could be used in an existing fleet with little or no change in vehicle performance and materials used in vehicle fuel systems.…”

Section: Prospects For the Production Of Motor Gasolinementioning

confidence: 99%

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Advanced Progress and Prospects for Producing High-Octane Gasoline Fuel toward Market Development: State-of-the-Art and Outlook

Abdellatief,

Ershov,

Savelenko

et al. 2023

Energy Fuels

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The development of oil refining in advanced nations is mostly focused on low-carbon fuel. Similar efforts are being made to improve the fuel efficiency of internal combustion engines, which will result in lower exhaust emissions. Furthermore, by assessing the indicated trends in engine building, it is important for fuel manufacturers to understand how the requirements for gasoline quality indicators will change, primarily for its knock resistance. The aim of the current comprehensive article is to study the state-of-the-art review emphasizing recent progress and prospects for producing high-octane gasoline fuel toward market development. The market for branded gasoline and multifunctional additives, involving friction modifiers, corrosion inhibitor components, as well as detergent components is presented. Furthermore, market development trends and quality requirements for motor gasoline, involving antiknocking characteristics and gasoline oxygenated compounds as additives, are exhibited. Besides, perspective gasoline engine technologies, including different types of engines, are declared. The formulation of effective gasoline surrogates is a challenging task due to advanced combustion strategies, engine design, and variable operating conditions in spark-ignition engines. The extensive development of direct injection and turbocharging technologies is constrained by the actual compression ratio of engines. Likewise, an increase in the knock resistance of the produced gasoline would further increase the compression ratio and efficiency of new internal combustion engines.

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Section: Market Development Trends and Qualitymentioning

confidence: 99%

Section: Prospects For the Production Of Motor Gasolinementioning

confidence: 99%

Advanced Progress and Prospects for Producing High-Octane Gasoline Fuel toward Market Development: State-of-the-Art and Outlook

Abdellatief,

Ershov,

Savelenko

et al. 2023

Energy Fuels

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“…Two recent studies demonstrated that the use of asynchronous intake valves resulted in the creation of a vortex, based on the concept of tumble, which influenced the movement of air and enhanced turbulent kinetic energy during the mixing process. As a result, this led to a reduction in the coefficient of variation of the indicated mean effective pressure (COV-IMEP) [81,82]. Another study investigated the effect of valve timing on fuel consumption and concluded that brake-specific fuel consumption (BSFC) was reduced and knocking at high loads was mitigated [83].…”

Section: State-of-the-artmentioning

confidence: 99%

Investigation of Flow Fields Emanating from Two Parallel Inlet Valves Using LES, PIV, and POD

Hoffmann,

Vera-Tudela,

Mirsch

et al. 2023

Energies

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Understanding cycle-to-cycle variations (CCV) is of practical importance for the combustion of fossil and renewable fuels, as increasingly stringent emission regulations require reductions in the negative effects of such variations. The subject of this study is the flow around inlet valves, since oscillations of such inlet flows affect the flow structure in the cylinder and are thus one of the causes of CCV. To this end, a parametric analysis of the influences of the mass flow rate and valve lift of two parallel engine intake valves on the flow structures is performed. This follows on from an earlier similar study where the flow around a single intake valve was investigated. To analyse the flow behaviour and, in particular, the interactions of the flow leaving these two valves, an optical test rig for 2D particle image velocimetry (PIV) and a large eddy simulation (LES) are used. Proper orthogonal decomposition (POD), together with a quadruple decomposition and the Reynolds stress transport equations, are used to study the turbulence phenomena. The PIV and LES results are in good agreement with each other. The detailed LES analysis of the flow structures shows that, for small valve lifts, the flow separates along the whole perimeter of the intake valve, and for larger valve lifts, the flow escapes only to one side. This is, for combustion engines with the tumble concept, the stage at which the tumble movement develops. Moreover, the flow structures are strongly influenced by the valve lift, while they are unaffected by the variation in the mass flow. The turbulent kinetic energy in the flow field increases quadratically with a decreasing valve lift and increasing mass flow. The large, high-energetic flow structures are particularly dominant near the jet, and the small, low-energetic structures are homogeneously distributed within the flow field. The specific Reynolds stress transport equation shows the limitations of two-dimensionality and large timesteps in the PIV results and the limitations of the LES model.

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Improving the lean burn performance of a high compression ratio methanol engine by multiple-injection

Duan,

Li,

Liu

et al. 2024

Applied Thermal Engineering

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Experimental investigation the effects of Miller cycle coupled with asynchronous intake valves on cycle-to-cycle variations and performance of the SI engine

Cited by 9 publications

References 41 publications

Advanced Progress and Prospects for Producing High-Octane Gasoline Fuel toward Market Development: State-of-the-Art and Outlook

Advanced Progress and Prospects for Producing High-Octane Gasoline Fuel toward Market Development: State-of-the-Art and Outlook

Investigation of Flow Fields Emanating from Two Parallel Inlet Valves Using LES, PIV, and POD

Improving the lean burn performance of a high compression ratio methanol engine by multiple-injection

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