A Study Isolating the Effect of Bore-to-Stroke Ratio on Gasoline Engine Combustion Chamber Development

Hoag, Kevin; Mangold, Barrett; Alger, Terrence; Abidin, Zainal; Wray, Christopher; Walls, Mark; Chadwell, Christopher

doi:10.4271/2016-01-2177

Cited by 12 publications

(13 citation statements)

References 12 publications

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“…Three different B/S ratios equal to 0.94, 0.83 and 0.70 were investigated. The compression ratio for case 1, 2 and Thus, as expected, longer strokes would result in faster combustion duration while the engine bore is held constant thanks to higher MPS [114,115]. Moreover, cases with smaller bore (Case 4,5 and 6) show higher τt profiles compared to the baseline Case1.…”

Section: Bore To Stroke Ratio Effect On In-cylinder Turbulencesupporting

confidence: 55%

“…Among the various parameters that can be explored during development, the bore to stroke (B/S) ratio, is one of the most important characteristics affecting the fuel efficiency of SI engines [112]. Depending on the engine application an optimum B/S ratio can be determined [1,3,112,115]. For instance, large B/S ratios improve the engine breathing and, at a given engine speed, reduce the mean piston speed (MPS) increasing the engine operating range.…”

Section: Engine Burn Rate Prediction For Different Bore To Stroke Ratiosmentioning

confidence: 99%

“…Increasing the stroke length results in faster MPS. Therefore, due to the higher mixture speed reached during the compression stroke, greater in-cylinder turbulence intensity is generated reducing the combustion duration [115]. High-performance engines, characterised by elevated specific power output and high engine speeds, have B/S ratios that are greater than the unity.…”

Section: Engine Burn Rate Prediction For Different Bore To Stroke Ratiosmentioning

confidence: 99%

“…Reducing the bore diameter is an effective mean to suppress abnormal combustion processes. A more compact chamber geometry shortens the distance to be travelled by the flame front reducing the time available to the auto-ignition chemical reactions [13,112,115]. Case 1 (see Table 15) was used as baseline case for the following analysis.…”

Section: Engine Burn Rate Prediction For Different Bore To Stroke Ratiosmentioning

confidence: 99%

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A process for an efficient heat release prediction at the concepts screening stage of gasoline engine development

Rota

Morgan

Mustafa

et al. 2020

International Journal of Engine Research

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In recent years, the exploration of new combustion technologies has accelerated in response to increasingly stringent emissions regulations and fuel economy demands. Virtual engineering tools, that enable the screening of novel hardware and engine calibrations at the early stage of engine development, have become imperative to meet new emission regulations. One-dimensional engine simulations are used at the start of the design of a new engine to define the overall combustion system geometries. Later, more complex three-dimensional computational fluid dynamics calculations are coupled to one-dimensional engine system codes to optimise initial concept geometries and define a system design ready for prototyping. To provide meaningful results, one-dimensional engine system codes often use empirical-based combustion models to calculate the engine burn rate. Moreover, realistic engine burn rates responses, for the entire engine map and for different calibrations, are required to provide three-dimensional computational fluid dynamics codes with correct boundary conditions during the design optimisation phase. Thus, the burn characteristic of new non-traditional combustion solution, for which little experimental data are available, needs to be initially assumed. To improve virtual development and reduce this uncertainty, the industry’s attention shifted towards quasi-dimensional combustion models capable of providing engine burn rate predictions. Within the quasi-dimensional modelling framework, turbulence models, adding extra user-input variables, are required to capture the effect of different combustion chamber geometries on the engine combustion rate. Rigorous validation of zero-dimensional turbulence models for different engine concepts and calibrations is therefore needed to enable quasi-dimensional combustion models to predict the engine burn rate. An alternative methodology, with limited dependency on previous test data, is required to enhance the exploration of novel combustion strategies and geometric architectures. An available process, based on a quasi-dimensional combustion stochastic reactor model, a one-dimensional engine system model and non-combusting three-dimensional computational fluid dynamics calculations, was used for this work. The approach uses limited non-combusting computational fluid dynamics calculations and a previously developed scaling factor response for the stochastic reactor model turbulence input ( τSRM) to quickly predict the engine rate of heat release. In this work, the scaling factor response was assessed against two different engine variants over a variety of engine operating conditions. Moreover, the same response was used to predict the effect of different bore-to-stroke ratios on the engine combustion rate and knock tolerance. Non-combusting computational fluid dynamics and one-dimensional engine system simulations have been carried out to investigate changes in turbulence characteristics due to different engine variants and bore-to-stroke ratios. It was shown that limited number of non-combusting computational fluid dynamics runs is required to characterise the in-cylinder turbulence for each explored engine variant. The scaling factor response was used to manipulate the turbulence input ( τSRM) resulting in good engine burn rates predictions for the explored engine variants and bore-to-stroke ratios. The presented methodology showed augmented predictive capabilities and has potential to move the engine development towards a less hardware dependent virtual approach, offering a practical solution for the exploration of new engine concepts.

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Section: Bore To Stroke Ratio Effect On In-cylinder Turbulencesupporting

confidence: 55%

Section: Engine Burn Rate Prediction For Different Bore To Stroke Ratiosmentioning

confidence: 99%

Section: Engine Burn Rate Prediction For Different Bore To Stroke Ratiosmentioning

confidence: 99%

Section: Engine Burn Rate Prediction For Different Bore To Stroke Ratiosmentioning

confidence: 99%

See 2 more Smart Citations

A process for an efficient heat release prediction at the concepts screening stage of gasoline engine development

Rota

Morgan

Mustafa

et al. 2020

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Experimental studies based on B/S ratios were often conducted. [8,9]. However, in the case of engine research based on most B/S ratios, the torque and engine power comparison is a study.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Bore to Stroke Ratio on Combustion, Gaseous and Particulate Emissions in a Small Port Fuel Injection Engine Fueled with Ethanol Blended Gasoline

Jang

Choi

et al. 2020

Energies

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The purpose of this study is to analyze the combustion characteristics of the port fuel injection (PFI) engine considering the fuel mixing ratio, bore to stroke (B/S) ratio and gaseous and particle emissions. Experiments were conducted in a small single-cylinder PFI engine with a displacement of 125 cc. The fuel used in the experiment was a mixture of pure gasoline and ethanol. The engine was operated at 5000 rpm at full load and wide-open throttle. In addition, combustion and exhaust characteristics of the engines with a B/S ratio of 0.88 and 1.15 were analyzed. The combustion pressure inside the combustion chamber was measured to analyze the indicated mean effective pressure (IMEP) and the heat release rate, and the combustion rate was calculated. In the results of combustion characteristics by the difference of B/S ratio, the influence of flame propagation velocity and turbulence intensity is the largest. The 0.88 B/S ratio engine, which has a small bore, has a faster combustion rate than the 1.15 B/S ratio engine due to its larger flame surface area and larger turbulence intensity. This represents a higher efficiency combustion result. Finally, the high oxygen content of ethanol has the characteristic of decreasing soot formation and increasing particle oxidation.

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Effects of Various Bore–Stroke Ratios on Hydrogen Direct Injection Spark Ignition Engines With Variable Valve Timing Under Low-Load Conditions

Kim,

Lee,

Lee

et al. 2024

Int.J Automot. Technol.

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A Study Isolating the Effect of Bore-to-Stroke Ratio on Gasoline Engine Combustion Chamber Development

Cited by 12 publications

References 12 publications

A process for an efficient heat release prediction at the concepts screening stage of gasoline engine development

A process for an efficient heat release prediction at the concepts screening stage of gasoline engine development

Effects of the Bore to Stroke Ratio on Combustion, Gaseous and Particulate Emissions in a Small Port Fuel Injection Engine Fueled with Ethanol Blended Gasoline

Effects of Various Bore–Stroke Ratios on Hydrogen Direct Injection Spark Ignition Engines With Variable Valve Timing Under Low-Load Conditions

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