Experimental investigation of swirl motion of in-cylinder flow in CI engine under firing condition due to preinjection using PIV and POD techniques

Aljarf, Saad; Singh, Hardeep; V, Baiju; Ichiyanagi, Mitsuhisa; Suzuki, Takashi

doi:10.1007/s41104-023-00126-y

Cited by 2 publications

(4 citation statements)

References 26 publications

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“…Their study also focused only on the compression stroke, where the eccentricity of the swirl center also caused in-cylinder flow to be asymmetric, which lowered the swirl ratio. In our previous studies, we measured the flow velocity inside cylinders when changing the engine speed and the opening area of helical ports under both the motored-and the fired-engine conditions [14,15,34,35]. We found that by changing the helical port's opening areas, SCPs do not shift significantly, and airflow velocities do not change with an increase in engine speed.…”

Section: Introductionmentioning

confidence: 91%

“…Figure 1 illustrates the experimental apparatus based on the optical single cylinder diesel engine, and Table 1 provides the specification of the PIV system, which was similar to our previous studies [14,15,34,35].…”

Section: Experimental Apparatusmentioning

confidence: 97%

“…Figure 1 illustrates the experimental apparatus based on the optical single cylin diesel engine, and Table 1 provides the specification of the PIV system, which was sim to our previous studies [14,15,34,35]. An optical four-valve engine with two intake ports and two exhaust ports was used during the PIV experiments.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…However, since these methods measure only one point in a flow field, it is difficult to measure flow velocities in the entire engine cylinder. Therefore, the particle image velocimetry (PIV) technique has garnered attention in terms of measuring flow velocities simultaneously at multiple points inside the engine cylinders without interfering with the flow fields [12,[24][25][26][27][28][29][30][31][32][33][34][35][36][37]. In [30], the PIV technique was applied during the compression stroke to a light-duty optical diesel engine.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the In-Cylinder Flow of a Compression Ignition Optical Engine for Different Tangential Port Opening Areas

Ichiyanagi,

Yilmaz,

Hamada

et al. 2023

Energies

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The push for decarbonization of internal combustion engines (ICEs) has spurred interest in alternative fuels, such as hydrogen and ammonia. To optimize combustion efficiency and reduce emissions, a closer look at the intake system and in-cylinder flows is crucial, especially when a hard-to-burn fuel, such as ammonia is utilized. In port fuel injection ICEs, airflow within cylinders profoundly affects combustion and emissions by influencing the air–fuel mixing phenomenon. Adjusting intake port openings is an important factor in controlling the in-cylinder airflow. In previous experiments with a transparent cylinder, tangential and helical ports demonstrated that varying the helical port’s opening significantly impacts flow velocities, swirl ratios, and swirl center positions (SCPs). In this study, we used a particle image velocimetry technique to investigate how the tangential port’s opening affects intake and in-cylinder flows. Flow velocities were assessed at different planes near the cylinder head, evaluating streamline maps, turbulent kinetic energy (TKE), and SCPs. Under the given experimental conditions, swirl flows were successfully generated early in the compression stroke when the tangential port opening exceeded 25%. Our findings emphasize the importance of minimizing TKE and SCP variation for successful swirl flow generation in engine cylinders equipped with both tangential and helical ports.

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Section: Introductionmentioning

confidence: 91%

Section: Experimental Apparatusmentioning

confidence: 97%

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Investigation of the In-Cylinder Flow of a Compression Ignition Optical Engine for Different Tangential Port Opening Areas

Ichiyanagi,

Yilmaz,

Hamada

et al. 2023

Energies

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Enhancing Homogeneity and Combustion Efficiency in Gas Engines: A Novel Approach through Swirl-Inducing Air Intake Pipe Modifications

Gutierrez,

Taco

2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">The lack of a homogeneous air-fuel mixture in internal combustion engines is a major cause of pollutant emissions, such as carbon monoxide (CO) and hydrocarbons (HC). This paper focuses on the design, simulation, and testing of a modified air intake pipe for a gas engine, incorporating deflectors to induce a swirl effect in the air-fuel mixture. To determine the optimal configuration for the deflectors and the diameter of the air intake pipe, several Computational Fluid Dynamics (CFD) simulations were conducted. The best results were then tested on a real gas engine. The primary objective of this study is to offer a solution for increasing the homogeneity level of the air-fuel mixture in gas engines, without requiring significant changes to engine components. In this case, achieving this goal involves only relatively small modifications to the air intake pipe. The results indicate that the swirl effect effectively enhances the homogeneity of the air-fuel mixture by generating higher turbulence along the air intake path. Critical to the success of the modification is the maintenance of the original pressure drop along the pipe. To compensate for the restriction caused by the deflector in the cross-sectional area of the air intake pipe, it is necessary to increase the diameter of the pipe. The most challenging aspect was achieving a reduction in CO and HC emissions due to the deflectors, rather than solely relying on the increased diameter of the air intake pipe. Importantly, the goal was to maintain engine power without a corresponding increase in fuel consumption. Contrary to the common belief that any device disrupting the free flow through the air intake pipe causes pressure losses, our findings suggest that the right configuration of pipe diameter, along with the appropriate number and positioning of deflectors, can yield better results than maintaining an unrestricted airflow. In summary, our work presents a device intended for implementation in the air intake pipe of gas engines, inducing a swirl in the air-fuel mixture without creating pressure losses compared to the original engine condition. This modification successfully reduces CO and HC levels, serving as an indicator of improved combustion resulting from a more homogeneous air-fuel mixture.</div></div>

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Experimental investigation of swirl motion of in-cylinder flow in CI engine under firing condition due to preinjection using PIV and POD techniques

Cited by 2 publications

References 26 publications

Experimental Investigation of the In-Cylinder Flow of a Compression Ignition Optical Engine for Different Tangential Port Opening Areas

Experimental Investigation of the In-Cylinder Flow of a Compression Ignition Optical Engine for Different Tangential Port Opening Areas

Enhancing Homogeneity and Combustion Efficiency in Gas Engines: A Novel Approach through Swirl-Inducing Air Intake Pipe Modifications

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