Design of a Tumble-Orientated Intake Port Layout for a Gasoline Combustion Process Used in Power Sport Application

Schögl, Oliver; Edtmayer, Hermann; Schmidt, Stephan; Leiber, S.; Schabetsberger, Thomas

doi:10.4271/2011-32-0589

Cited by 12 publications

(8 citation statements)

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“…Increasing these values can also increase combustion efficiency. 2–4 There are three ways to increase TR and SR: changing the angle or geometric design of intake, 1,3,5–18 the intake baffle, 2–4,12,14,19 and the geometric design of piston. 18,20,21…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4]6,13 An accurate quantification of the tumble level for a specific intake and combustion-chamber layout represents a key factor to the improvement and shortening of the engine design process. 22 Several Variation of the flow field can also be discussed through numerical simulation 1,[8][9][10][11][12]20,22 collocating with experiments. 6,7,13,14,19 In some literature, it was proposed that modifying the intake baffle to change the shape of the intake port, which can change the direction of the induced flow or its velocity.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1(b) shows the swirl flow, which rotates around the Z -axis. 1 Dimensionless parameters for the two airflows are defined as the tumble ratio (TR) and swirl ratio (SR). Increasing these values can also increase combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing these values can also increase combustion efficiency. [2][3][4] There are three ways to increase TR and SR: changing the angle or geometric design of intake, 1,3,[5][6][7][8][9][10][11][12][13][14][15][16][17][18] the intake baffle, [2][3][4]12,14,19 and the geometric design of piston. 18,20,21 Increasing TR or SR improves not only fuel-air mixture and combustion efficiency but also a cycle-by-cycle variation (CBCV).…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12]19 The results of the numerical simulation can also be compared with experimental data to verify its accuracy. 1,7,8,20 It was found that the error between experimental and simulated intake flow is 5%-7% by using steady and unsteady simulation of the flow field in the intake port or cylinder. Therefore, numerical simulation is indeed available for engine design.…”

Section: Introductionmentioning

confidence: 99%

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Influence of tumble and TKE on combustion, fuel economy, and emissions of a single cylinder motorcycle engine

Lee

2022

International Journal of Engine Research

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The impact of gasoline engines on improving fuel consumption and reducing emissions has received increasing attention around the world, and emissions regulations have become stricter. However, complex techniques in engine improvement increase costs. The purpose of this study is to develop or improve the design of the intake geometry without additional cost to improve the engine thermal efficiency, thereby improving fuel economy and emissions. In this study, emissions and fuel consumption of a 125 c.c. commercially available motorcycle was investigated. In addition to modifying the intake and valve angles and maintaining the intake air volume, a software for computational fluid dynamics (CFD) was used for steady-state and transient analysis of the in-cylinder flow field, tumble ratio and turbulence kinetic energy (TKE), and the results were compared with the data of the experimental platform. The burn duration of the engine, indicated mean effective pressure (IMEP), indicated specific total hydrocarbons (ISHC), nitrogen oxide (ISNOx) and carbon monoxide (ISCO) were measured on the bench. The transient predicted results show that the tumble ratio is a maximum increase of 27.82% at 656 crank angle (CA) degrees near the top dead center (TDC) on the compression stroke. In the ignition area within 5°–20° before top dead center (BTDC), average of the turbulence kinetic energy (TKE) was 120.37 m2/s2, distributed hot area was wide and close to the ignition position. In the steady-state measurement, it was verified that the tumble ratio was significantly improved by modifying inlet, the same trend as the analysis result. In the bench test for full load measurement, the average of IMEP increased by 10.92%, indicated specific fuel consumption (ISFC) improved by 11.7%, burn duration increased by 25.27%, ISCO improved by 43.41%, and ISHC improved by 64.33%. For portion load measurement, the average of ISFC improved by 2.16%, burn duration increased by 24.84%, ISCO improved by 43.44%, ISHC improved by 17.7% and ISNO improved by 12.89%. Based on the results, the tumble and TKE were improved by optimizing the angle between the intake valve and the intake port. The ISFC of model B was significantly improved under the two states. The ignition delay time was longer, and the overall burn duration was much improved. When it came to emissions, the ISCO and ISHC were significantly improved, and the ISNO was much higher at full load but lower at partial load due to the engine temperature and engine loads. At partial loads, the high tumble did benefit the combustion, fuel economy and emissions of a single-cylinder motorcycle engine.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of tumble and TKE on combustion, fuel economy, and emissions of a single cylinder motorcycle engine

Lee

2022

International Journal of Engine Research

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Influence of the manufacturing process tolerance on the swirl number of a low-capacity engine

Castilla¹,

Pastor

Montanero

2016

Journal of Manufacturing Systems

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Theoretical and Experimental Analysis of the Steady Flow Across the Cylinderhead of a Low-Capacity Engine

Castilla¹,

Rubio

Ferrera

et al. 2016

Journal of Applied Mechanics

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The air flow that crosses the cylinderhead of a low-capacity engine is studied both theoretically and experimentally in the steady regime. We analyze the dependence of both the discharge coefficient and swirl number on the Reynolds number and valve lift. The formation of the turbulent vortex in the cylinder is described by measuring the 2D velocity distribution over several cylinder cross sections. The integration of the Reynolds-averaged Navier–Stokes (RANS) equations reproduces satisfactorily the experimental data, especially the swirl number values.

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Design of a Tumble-Orientated Intake Port Layout for a Gasoline Combustion Process Used in Power Sport Application

Cited by 12 publications

References 0 publications

Influence of tumble and TKE on combustion, fuel economy, and emissions of a single cylinder motorcycle engine

Influence of tumble and TKE on combustion, fuel economy, and emissions of a single cylinder motorcycle engine

Influence of the manufacturing process tolerance on the swirl number of a low-capacity engine

Theoretical and Experimental Analysis of the Steady Flow Across the Cylinderhead of a Low-Capacity Engine

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