Numerical Investigation of Increasing Turbulence through Piston Geometries on Knock Reduction in Heavy Duty Spark Ignition Engines

Mahendar, Senthil Krishnan; Giramondi, Nicola; Venkataraman, Abinaya Priya; Erlandsson, Anders Christiansen

doi:10.4271/2019-01-2302

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…To obtain better accuracy in the e ciency estimates, CFD simulations or in-cylinder turbulence measurements are required, which was outside the scope of this work. If motoring CFD results are available, the delity of 1D simulations with SITurb can be improved using a methodology similar to a previous study [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

The Impact of Miller Valve Timing on Combustion and Charging Performance of an Ethanol- and Methanol-Fueled Heavy-Duty Spark Ignition Engine

Mahendar

Venkataraman

Erlandsson³

2021

SAE Int. J. Engines

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Section: Discussionmentioning

confidence: 99%

The Impact of Miller Valve Timing on Combustion and Charging Performance of an Ethanol- and Methanol-Fueled Heavy-Duty Spark Ignition Engine

Mahendar

Venkataraman

Erlandsson³

2021

SAE Int. J. Engines

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“…A simpler change may be using piston shapes to improve squish and increase turbulence close to TDC. The potential improvement offered by higher squish pistons were tested through a previous simulation study 50 compared to the piston used in this experimental study. With increase in combustion speed, the end gas could be consumed before the critical residence time for auto-ignition is reached.…”

Section: Discussionmentioning

confidence: 99%

“…A bathtub style geometry was used to minimize potential hot spots and is shown as ''baseline'' in a previous publication. 50 A CR of 13 is fairly higher than boosted LD gasoline and was chosen to improve efficiency for part load ethanol and methanol. The stock diesel cylinder head and intake ports were used which produces swirl.…”

Section: Methodsmentioning

confidence: 99%

Alcohol lean burn in heavy duty engines: Achieving 25 bar IMEP with high efficiency in spark ignited operation

Mahendar

Larsson

Erlandsson

2020

International Journal of Engine Research

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Knock is the most crucial limitation in attaining the peak load required at high efficiency in heavy duty (HD) spark ignition (SI) engines. Renewable fuels such as ethanol and methanol have high resistance to autoignition and can help overcome this limitation. To reduce knock and improve efficiency further, dilution can be used to add specific heat capacity and reduce combustion temperature. This work studied diluted combustion and knock characteristics of gasoline, ethanol, and methanol on a HD SI single cylinder engine for a wide load range. Ethanol and methanol displayed excellent knock resistance which allowed a peak gross IMEP of 25.1 and 26.8 bar respectively, compared to gasoline which only reached 8.3 bar at [Formula: see text]1.4 with a compression ratio of 13. Over 18% increase in gross IMEP was possible for gasoline and ethanol when increasing air excess ratio from 1 to 1.4. Methanol achieved the target gross IMEP at [Formula: see text]1 and required no spark retard at [Formula: see text]1.6. A peak indicated efficiency above 48% was recorded for ethanol and methanol at [Formula: see text]1.6 and gross IMEP of approximately 21 bar. At part loads, stable operation was possible until [Formula: see text]1.8 for all fuels. Increase in intake temperature showed a marginal improvement in stability but no increase in lean limit. The concept shows promise as diluted combustion of ethanol and methanol reduced knock and achieved diesel baseline load. With optimization, there is potential to improve efficiency further and possible cost savings compared to commercial diesel engines.

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“…The combustion duration increased with dilution but was counteracted to some extent by the increased in-cylinder turbulence. The peak of the increased cylinder turbulence occurred at or slightly prior to TDC (Mahendar et al, 2019b). This also added to the increased cylinder pressure for the dilution.…”

Section: In-cylinder Processmentioning

confidence: 93%

“…1. The combustion chamber of the tested SCRE was a bowl-in piston type (Mahendar et al, 2019a). The cylinder pressure signal was sampled at 0.1 • CA resolution by an AVL GU21D piezoelectric sensor.…”

Section: Methodsmentioning

confidence: 99%

Energy and Exergy Characteristics of an Ethanol-Fueled Heavy-Duty Si Engine at High-Load Operation Using Lean-Burn Combustion

Hong¹,

Lius²,

Mahendar³

et al. 2022

SSRN Journal

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Numerical Investigation of Increasing Turbulence through Piston Geometries on Knock Reduction in Heavy Duty Spark Ignition Engines

Cited by 5 publications

References 22 publications

The Impact of Miller Valve Timing on Combustion and Charging Performance of an Ethanol- and Methanol-Fueled Heavy-Duty Spark Ignition Engine

The Impact of Miller Valve Timing on Combustion and Charging Performance of an Ethanol- and Methanol-Fueled Heavy-Duty Spark Ignition Engine

Alcohol lean burn in heavy duty engines: Achieving 25 bar IMEP with high efficiency in spark ignited operation

Energy and Exergy Characteristics of an Ethanol-Fueled Heavy-Duty Si Engine at High-Load Operation Using Lean-Burn Combustion

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