Impact of Bore-to-Stroke Ratio Over Light-Duty DI Diesel Engine Performance, Emissions and Fuel Consumption: An Analytical Study Using 1D-CFD Coupled with DOE Methodology

Vassallo, Alberto; Gopalakrishnan, Vishrawas; Arrigoni, Stefano; Cavallo, Roberto; Turcato, Riccardo; Racca, Alberto

doi:10.4271/2013-24-0013

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…Lower bowl volume with the lower injection angle and smaller spray cone angle caused to obtain better engine performance. Vassallo et al 20 have studied the impact of bore-to-stroke ratio on a DI diesel engine performance and emission characteristics using the DOE methodology. They have deduced that the square design causes outstanding compromise between specific power rating and low-end torque.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis on the effect of premixed ratio, EGR, and diesel fuel injection parameters on the performance and emissions of a NG/Diesel RCCI engine using a DOE method

Poorghasemi

Saray

Ansari

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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In reactivity-controlled compression ignition (RCCI) engines, the ignition and combustion of premixed low reactive fuel (LRF) such as natural gas (NG) is controlled by the injection of high reactive fuel (HRF) such as diesel fuel during the compression stroke. In this study, the effects of six different input parameters on the performance and emissions of the natural gas/diesel fueled RCCI engine are studied using fractional factorial design (FFD) method, which is one of the design of experiment (DOE) methods. In this method, the effects of the interactions of input parameters, referred to as “factors,” on the outputs, referred to as “responses,” are investigated. The factors include premixed ratio (PR), start of first injection (SOI1), spray angle (SA), exhaust gas recirculation (EGR), start of second injection (SOI2), and mass fraction of first injection. Sixteen runs were conducted to evaluate the effects of the interaction between input factors on performance and emissions of a RCCI engine using a validated computational fluid dynamics (CFD) model. DOE results indicate that in order to increase gross indicated efficiency (GIE), higher premixed ratio, 85%, with wider spray angle, 150°, is an effective way. Meanwhile, carbon monoxide (CO) and unburned hydrocarbons (UHC) emissions as well as ringing intensity (RI) are decreased at this condition. To reduce NOx emissions, it is beneficial to raise premixed ratio from 55% to 85% or to use 40% EGR, independently.

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Section: Introductionmentioning

confidence: 99%

Statistical analysis on the effect of premixed ratio, EGR, and diesel fuel injection parameters on the performance and emissions of a NG/Diesel RCCI engine using a DOE method

Poorghasemi

Saray

Ansari

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…8 It is also reported that the reduced convection heat losses at part load could compensate the unfavorable surface/volume ratio for a ''square'' design with B/S ratio of 1, resulting in fuel consumption benefits by improving the reciprocating and rotating components stress and friction at high speed. 21 In addition to the fuel conversion efficiency, the variation in the B/S ratio also shows impacts on exhaust emissions. As the B/S ratio increases, the increased crevice volume could lead to increased carbon monoxide (CO) and hydrocarbon (HC) emissions, 17,18 but lower nitrogen oxide (NOx) emissions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of bore/stroke ratio and scavenge port angles on the scavenging process in a two-stroke boosted uniflow scavenged direct injection gasoline engine

Wang

Zhao

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this study, a two-stroke boosted uniflow scavenged direct injection gasoline (BUSDIG) engine was proposed and researched to achieve aggressive engine downsizing and downspeeding. Compared to loop or cross scavenged twostroke engines, the BUSDIG engine can achieve excellent scavenging performance and be operated with higher boost pressure as well as the absence of air and fuel short-circuiting. As a fundamental engine geometric parameter, the bore/ stroke (B/S) ratio would directly affect the scavenging process in the uniflow scavenged two-stroke engine. Three-dimensional computational fluid dynamics simulations were used to investigate the scavenging process in the BUSDIG engine with different B/S ratios. Four B/S ratios of 0.66, 0.8, 1, and 1.3 were analyzed. The results indicate that a bigger B/S ratio leads to deteriorated swirl flow motion but better delivery ratio, scavenging efficiency, and charging efficiency. In order to fulfil the potential of the BUSDIG engine with different B/S ratios, two key scavenge port angles, i.e. axis inclination angle (AIA) and swirl orientation angle (SOA), were varied from the baseline design (AIA = 90°, SOA = 20°) to study their effects on the scavenging process for each B/S ratio design. Overall, a larger AIA leads to lower swirl ratio (SR) but achieves better scavenge performance, which is crucial for a large B/S ratio design. A small SOA design leads to noticeably lower SR but superior scavenging performances for a small B/S ratio design. An intermediate SOA, e.g. 10 and 20°, is preferred to improve the scavenging for a large B/S ratio design.

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“…However, these models tend to excessively simplify the combustion process or even use correlations to simulate its behavior. Vassallo et al [14] carried out an investigation of the impact of B/S ratio also on a light-duty engine. The results were obtained by employing a 1D approach based on Design of Experiments (DOE) methodology.…”

Section: Introductionmentioning

confidence: 99%

A computational analysis of the impact of bore-to-stroke ratio on emissions and efficiency of a HSDI engine

et al. 2017

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Research on combustion systems for Internal Combustion Engines (ICE) is guided by the necessity of improving engine efficiency while achieving the pollutant regulations. In this framework, this study identifies and describes the effect of the bore-to-stroke ratio (B/S) on the combustion system performance and emissions by means of computational fluid dynamics (CFD). The study is applied to a 4-cylinder 4-stroke High Speed Direct Injection (HSDI) CI engine. It is divided in two parts, the first part is focused on one operating point and presents a detailed description of the main effects of different B/S ratios configurations, and the second part compares the results with different engine operating conditions. For both parts the air management, injection settings and compression ratio were kept constant in order to isolate the impact of the B/S ratio. The results confirmed that the indicated thermal efficiency was increased for lower B/S ratio because of the combustion chamber surface area decrease and faster combustion. Regarding the emissions, NOx and soot presented a strong and opposed dependence on B/S ratio generated mostly due to enhanced air-fuel mixing for lower B/S ratio. Finally, those trends were proven to be independent from the operating condition, giving the study a more general value.

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Impact of Bore-to-Stroke Ratio Over Light-Duty DI Diesel Engine Performance, Emissions and Fuel Consumption: An Analytical Study Using 1D-CFD Coupled with DOE Methodology

Cited by 8 publications

References 6 publications

Statistical analysis on the effect of premixed ratio, EGR, and diesel fuel injection parameters on the performance and emissions of a NG/Diesel RCCI engine using a DOE method

Statistical analysis on the effect of premixed ratio, EGR, and diesel fuel injection parameters on the performance and emissions of a NG/Diesel RCCI engine using a DOE method

Analysis of the effect of bore/stroke ratio and scavenge port angles on the scavenging process in a two-stroke boosted uniflow scavenged direct injection gasoline engine

A computational analysis of the impact of bore-to-stroke ratio on emissions and efficiency of a HSDI engine

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