Aufladung von Verbrennungsmotoren

Basshuysen, Richard van; Schäfer, Fred

doi:10.1007/978-3-322-99423-3_11

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…𝑢 𝑝 − 𝑢 𝑓 (𝟑)A maximum observed value for 𝑊𝑒 of 4.5 implies any further breakup is unlikely, with these mechanisms becoming significant as 𝑊𝑒 exceeds 10[31].…”

mentioning

confidence: 99%

Characterisation of the Tyre Spray Ejected Downstream of a Bluff Automotive Body

Crickmore¹,

Garmory²,

Butcher³

2022

SAE Int. J. Adv. & Curr. Prac. in Mobility

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Considerations of surface contamination and airborne spray are becoming increasingly significant throughout the automotive design process. Advanced driver assistance systems, such as autonomous cruise control, are growing in popularity. These systems rely on external sensors, the performance of which may be impaired by both direct obstruction and spray. Existing experimental methods of assessing front-end surface contamination and wiper performance have typically utilised fixed spray-grids positioned upstream of the vehicle. The resulting spray is largely steady in nature, in contrast to the unsteady flow-field and tyre spray that would be produced by preceding vehicles. This paper presents the numerical analysis of the spray ejected downstream of a simplified automotive body. The continuous phase (air) is solved using a DDES-based approach coupled with a Lagrangian representation of the dispersed phase (water). Two configurations are examined, a square-back configuration, and a variation employing 20° rear-end side tapers. The inclusion of side tapering results in a significant change in wake topology and the resulting spray cloud. Good agreement is achieved between initial single-phase predictions of the continuous phase and existing experimental data. The spray cloud of both configurations is found to be highly unsteady, driven by vortical structures in the nearand far-wake, and is altered significantly by what are relatively minor changes to the geometry. Proper Orthogonal Decomposition reveals comparable spatial modes in the mass flux field of the dispersed phase and the continuous phase velocity field downstream of the vehicle. However, the correlation between the temporal coefficients of these modes is relatively weak. This highlights the presence of slip effects between the two phases, coming as a result of particle inertia, and the need to consider both phases simultaneously in future studies of spray dynamics.

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“…𝑢 𝑝 − 𝑢 𝑓 (𝟑)A maximum observed value for 𝑊𝑒 of 4.5 implies any further breakup is unlikely, with these mechanisms becoming significant as 𝑊𝑒 exceeds 10[31].…”

mentioning

confidence: 99%

Characterisation of the Tyre Spray Ejected Downstream of a Bluff Automotive Body

Crickmore¹,

Garmory²,

Butcher³

2022

SAE Int. J. Adv. & Curr. Prac. in Mobility

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“…Mainly four different forms of valve springs, which are depicted in Figure 2, are used currently [7]. With a constant coil diameter and symmetric coil distances the cylindrical symmetric valve spring is the standard form.…”

Section: Common Valve Spring Formsmentioning

confidence: 99%

Simulation and Validation of Valve Springs in Valve Train Simulations

Clauberg¹,

Huber²,

Ulbrich³

Proceedings of the Eighth International Conference on Engineering Computational Technology

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In the first part of this paper an overview of smooth and non-smooth multibody dynamics is given and numerical simulation tequniques for non-smooth multibody systems with impacts are considered. The second part deals with valve springs and different existing valve spring models. A new valve spring model, based on the approximation of the spring as a curved beam, is presented and validated using a test rig. The paper concludes with the integration of the new developed and implemented valve spring model in a complete valve train simulation. The application example allows to compare between the new valve spring model and a multi-mass model regarding to computational time using different integrators with smooth and non-smooth contact mechanics.

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Aufladung von Verbrennungsmotoren

Cited by 2 publications

References 3 publications

Characterisation of the Tyre Spray Ejected Downstream of a Bluff Automotive Body

Characterisation of the Tyre Spray Ejected Downstream of a Bluff Automotive Body

Simulation and Validation of Valve Springs in Valve Train Simulations

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