Partial Regenerations in Diesel Particulate Filters

Haralampous, O. A.; Koltsakis, G. C.; Samaras, Zissis

doi:10.4271/2003-01-1881

Cited by 40 publications

(42 citation statements)

References 6 publications

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“…More details on the derivation of the model equations and the solution procedure can be found in previous publications [3,6,7].…”

Section: Modeling Of Catalysed Filter Regenerationmentioning

confidence: 99%

“…The link between the radial segments is done by the conductive heat exchange in the radial direction included in the energy balance. Compared to 1-D modelling [1,2], this 2-D model allows for the consideration of the effect of heat losses, thermal boundary layer at filter inlet and flow maldistribution as a result of non-uniform regeneration [3][4][5]. The model is equipped with intra-layer discretization to account for the coupling between reaction and diffusion phenomena in catalyzed filters [6][7][8][9].…”

Section: Modeling Of Catalysed Filter Regenerationmentioning

confidence: 99%

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2D simulation of the regeneration performance of a catalysed DPF for heavy-duty applications

Frey

Wenninger²,

Krutzsch³

et al. 2007

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The objective of this work is to study the regeneration performance of a heavy-duty DPF application. The simulation of the local temperatures and pressure drop during the regeneration could be validated with experimental data, indicating the need for a 2D model approach to describe this particular catalysed DPF configuration. Furthermore, the model was applied to illustrate the axial and radial regeneration phenomena focusing on soot and temperature distribution.

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“…More details on the derivation of the model equations and the solution procedure can be found in previous publications [3,6,7].…”

Section: Modeling Of Catalysed Filter Regenerationmentioning

confidence: 99%

Section: Modeling Of Catalysed Filter Regenerationmentioning

confidence: 99%

2D simulation of the regeneration performance of a catalysed DPF for heavy-duty applications

Frey

Wenninger²,

Krutzsch³

et al. 2007

Top Catal

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“…Investigating Eqn. (14), one can see that this equation effectively grows the solid fraction of the pore that is used to capture the PM through the mechanisms of Brownian diffusion and interception.…”

Section: Pm Mass Equationsmentioning

confidence: 99%

“…The current value of the unit spherical collector is based on the amount of deposited particulate in the wall: (14) Effectively, this equation determines the diameter of a unit spherical collector (hence, volume as indicated through third power) as a function of the volume of PM per pore and the initial unit spherical collector value. Investigating Eqn.…”

Section: Pm Mass Equationsmentioning

confidence: 99%

“…Employing an assumption that the density in the PM and wall layers is calculated from the ideal gas law and the average of the pressure across that zone [14]: Now, the representative channel equations can be solved by marching forward in the axial direction. Similar to previous efforts [15], the density and velocity in each channel (I and II) is combined into an effective flow term: (36) Drawing from experience with the two-channel model, a slight adaptation is made here with respect to this variable for the inlet channel.…”

Section: Channel Equationsmentioning

confidence: 99%

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Combining the Classical and Lumped Diesel Particulate Filter Models

Depcik¹

2015

SAE Int. J. Engines

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The control of PM that emanates from SIDI and CI engines is of significant concern for the automotive industry. This is because PM can infiltrate the alveoli in humans and transport toxic chemicals absorbed on the surface of the particle, subsequently leading to lung related illnesses [1]. As a result, the automotive industry now widely implements PM filtration in the exhaust. In particular, DPFs are used for CI engine exhaust with GPFs currently being considered for SIDI engines.The operation of a DPF (or analogous GPF) includes the storage of PM in and on top of a porous wall with its eventual regeneration in an oxidative environment. This can be accomplished actively utilizing O 2 or passively by employing NO 2 ; often through synchronization with an upstream Oxidation Catalyst. This need to modulate device operation has led to the development of simulation tools in order to reduce the number of experiments needed by predicting the pressure drop through the device and its temperature evolution. Broadly speaking, the models typically fall into one of two categories; those designated to operate within an Engine Control Unit (ECU) [2] and the classical two-channel approach [3].The ECU approach is designed for computational speed and is still often based on the two-channel model originally posed by Bissett [4]. In a previous effort by the author, the research in this area was reviewed and a derived model was generated that used dynamically incompressible flow to simulate the flow through the device while creating lumped zones in order to predict the temperature evolution. Utilizing a high-level coding language that runs significantly slower than traditional programming languages [5], the filter temperature evolution could be predicted relatively accurately in a faster than real time manner. This was because only one term in the governing energy equations was influenced by compressible flow. However, decoupling temperature and pressure by using dynamically incompressible flow (effectively negating the ideal gas law), the model was unable to simulate the pressure drop during warm-up and PM regeneration experiments.As a result, this effort seeks to merge the two models by simulating temperature using the ECU approach while estimating the pressure drop using the two-channel methodology. In specific, the temperature profile through the device is generated by the ECU version that is then utilized as a constant within the two-channel model removing the need to solve for the channel temperatures. Moreover, deep bed filtration is included in the model formulation in order to simulate the pressure drop evolution in the device more accurately. Finally, model run times are given in order to document the computational expense of the combined model. DPF MODEL DERIVATIONIn a previous effort, instead of simulating both the inlet and outlet channels along with a porous wall, model derivation followed a lumped approach through the creation of a variable number of zones Combining the Classical and Lumped Diesel Particulate Filter M...

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