Swirl measurements in a motor cylinder

Crnojevic, C.; Decool, F.; Florent, P.

doi:10.1007/s003480050321

Cited by 8 publications

(4 citation statements)

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“…Similar results were also observed by Rhode et al [1983] In another study with a similar combustor configuration, Altgeld et al [1983] found that the tangential velocity approached solid-body rotation near the exit. Crnojevic et al [1999] also reported a similar trend of the swirl velocity. Furthermore, unlike most other studies where swirl number is presented as a scalar quantity for a given flow condition, they showed the dependence of swirl number as a function of axial position as well as the volume flow rate.…”

Section: Introductionsupporting

confidence: 57%

“…To obtain both qualitative and quantitative comparisons of the results, swirl number, as well as the tangential and axial mean-velocity components, are used to study and identify any significant changes in the flow field brought about by the various blade lengths. Swirl number, defined as the ratio of the tangential to the axial component of the moment of momentum, is expressed in cylindrical coordinates as [Crnojevic et al, 1999] (5.6.5)…”

Section: Swirl Numbermentioning

confidence: 99%

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Reynolds-stress turbulence model in the KIVA code for engine simulation

Siow¹

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Section: Introductionsupporting

confidence: 57%

Section: Swirl Numbermentioning

confidence: 99%

Reynolds-stress turbulence model in the KIVA code for engine simulation

Siow¹

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“…Swirl is a rotational movement that occurs around the cylinder axis. In the study carried out by Crnojevic et al, the swirl movement that occurs due to the movement of the air mass coming from the manifolds into the cylinder was defined analytically and explained with the help of the cylinder of radius [27] R. The swirl number is the ratio between moments because of the changes in the tangential and axial components of momentum. In addition, it allows the determination of the swirl intensity.…”

Section: Swirl and Tumblementioning

confidence: 99%

0/1 and 3 - dimensional cold flow analysis of a diesel engine: A case study

Kethudaoglu,

Aktaş,

Karaaslan

et al. 2024

International Journal of Automotive Science and Technology

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Gas motion in the engine cylinder plays a critical role in the air-fuel mixing and combustion processes in diesel engines. Moreover, it influences the engine's performance and emissions, as well as its heat transfer. The intake air motion regulates the main phases of the flow in the cylinder, which is characterized by swirl, squish, and turbulence. Inducing swirl and tumble in the intake process provides high turbulence levels at ignition, resulting in more effective flame speeds and better combustion for lean air-fuel ratios or with EGR. This high turbulence also allows the flame front to reach the end gas before the chemical reactions start, leading to auto-ignition for usual air-fuel ratios. Additionally, it enables higher compression ratios without engine knocking. Computational fluid dynamics (CFD) software is used to enhance in-cylinder flow characteristics, and in this study, cold flow simulation of a naturally aspirated, direct injection diesel engine was conducted using AVL Fire M. Swirl, tumble, and TKE parameters were investigated to make a detailed analysis of the in-cylinder flow for the relevant engine.

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“…As a consequence of the importance of the flow during the intake stroke a variety of experiments have been performed on test benches as well as motored piston-cylinder assembly and optical access engines (Stansfield et al, 2007;Dierksheide et al, 2002). Integrated quantities, such as mass-flow rate and swirl intensity, have been investigated for a long time (Crnojevic et al, 1999). Developments of optical measurement techniques have made non-intrusive velocity measurements possible, and techniques such as Laser Doppler Velocimetry (LDV) (Payri et al, 1996;Desantes et al, 1995), Particle Tracking Velocimetry (PTV) (Khalighi, 1991), planar (Cosadia et al, 2007;Reeves et al, 1996), stereoscopic (Vernet, 2012;Rabault, 2015) and tomographic Particle Image Velocimetry (PIV) (Baum et al, 2013(Baum et al, , 2014van Overbrüggen et al, 2013) have been employed for in-cylinder flow studies.…”

Section: Introductionmentioning

confidence: 99%

A study using PIV of the intake flow in a diesel engine cylinder

Rabault

Vernet

Lindgren

et al. 2016

International Journal of Heat and Fluid Flow

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The admission flow generated by a parallel valve diesel engine cylinder head was investigated by planar and stereoscopic Particle Image Velocimetry in a steady flow test bench through measurements in the swirl and tumble planes. By combining several sets of measurements a full three-dimensional, three-component reconstruction of the flow was made. The flow out of the valves forms a jet which collides with the cylinder wall before flowing down along the wall. Despite the fact that there is no piston a recirculation bubble is formed in the tumble plane. This is due to the entrainment of gas into the jet which needs to be replaced and thereby sets up a counter flow. In the swirl plane complex jet-dominated vortex structures are detected close to the cylinder top. Moving away from the cylinder top, a counter-rotating vortex-pair structure is observed from which a single coherent swirling structure develops further down the cylinder. Some clear differences are observed between the flow at high and moderate valve lifts, which correspond to a distinct change in the swirl intensity. By introducing a strong swirling motion the flow is stabilized which can be seen by tracking the instantaneous position of the swirl centre. For high swirl the variation of the position of the swirl centre decreases substantially.

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Swirl measurements in a motor cylinder

Cited by 8 publications

References 0 publications

Reynolds-stress turbulence model in the KIVA code for engine simulation

Reynolds-stress turbulence model in the KIVA code for engine simulation

0/1 and 3 - dimensional cold flow analysis of a diesel engine: A case study

A study using PIV of the intake flow in a diesel engine cylinder

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