Numerical Simulation of Diesel Particulate Filters in Exhaust Systems

Hua, Xin; Liu, J.; Herrin, D. W.; Elnady, Tamer

doi:10.4271/2011-01-1559

Cited by 2 publications

(6 citation statements)

References 8 publications

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“…Equation ( 15) was a rearrange form of four-pole network under the condition of only the velocity boundary condition was acquired. Transfer matrix T II can be calculated by equation ( 16) 14,24 T…”

Section: Mathematical Calculation Model Of Transmission Lossmentioning

confidence: 99%

“…Based on the one-dimensional (1D) acoustic model, Allam and Å bom 13 improved the computational accuracy of thermal loss along the narrow channels according to the manner of the Zwikker and Kosten theory, and the computing frequency of the model was up to 800-1000 Hz. On the basis of 1D model, Hua et al 14 took the effect of inlet and outlet flow and viscous effect of pipeline into consideration, recalculating the transfer matrix of DPF to get the transmission loss of particulate trap system. Gao et al 15 created a calculation model of the particulate filter transfer matrix and calculated the insertion loss and transmission loss.…”

Section: Introductionmentioning

confidence: 99%

“…A unit velocity v 1 was applied as boundary conditions of the acoustic FEM model to obtain p 1 and p 2 . Parameters A*, B*, C*, and D* were expressed as equations (14) and (15) 14,24,29…”

Section: Mathematical Calculation Model Of Transmission Lossmentioning

confidence: 99%

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A transfer matrix approach for structural–acoustic correspondence analysis of diesel particulate filter

Hou

Liu

et al. 2017

Advances in Mechanical Engineering

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Diesel particulate filter is impedance to elastic wave. In order to promote the anechoic performance of diesel particulate filter in designing process, the acoustic characteristics of which were analyzed on the basis of acoustic four-terminal method. The transfer matrix of simplified diesel particulate filter structure was derived to construct the acoustic simulation model, and a two-load experiment of impedance tube was implemented to calibrate the simulation model. On this basis, the correlation between diesel particulate filter structural parameters and acoustic characteristics was investigated. The results show that the transmission loss is sensitive to porosity, gap, layer thickness, and aspect ratio of porthole for a certain diameter diesel particulate filter. Furthermore, two types of diesel particulate filter structures which were octagonal inlet matches square outlet and asymmetric square channels possess superior noise elimination effect compared with the traditional square channel types. At a certain frequency range, the peak noise was reduced by 2-3 dB. The study could provide guidance to the designing of diesel particulate filter anechoic performance.

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Section: Mathematical Calculation Model Of Transmission Lossmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A transfer matrix approach for structural–acoustic correspondence analysis of diesel particulate filter

Hou

Liu

et al. 2017

Advances in Mechanical Engineering

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“…Although the main purpose of the wall-flow DPF is the reduction of particulate matter emissions, its presence affects the unsteady wave dynamics in the exhaust system [21]. The flow path, the canning and the absorbent ceramic material composing the wall-flow monolith introduce a dissipative effect upstream of the muffler [22]. This modifies the boundary conditions for muffler design, usually leading to a substantial volume reduction [23] or even to its removal in cases of severe packaging restrictions [24], with the subsequent repercussion on exhaust backpressure.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, they developed a new version of the model including a correct description of the visco-thermal boundary layers for square cross-section channels [27]. The model proposed by Allam and Åbom is the basis for the definition of the transfer matrix in other linear models such as the 3D-FEM models proposed by Hua et al [22] to improve the prediction of the DPF response at very high frequencies. FEM modelling has been also explored by Gao et al [28] with further discussion on the correction of the viscosity.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational approach to the transient behaviour of wall-flow diesel particulate filters

Torregrosa

Serrano

Piqueras

et al. 2017

Energy

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The implementation of tight vehicle emission standards has forced manufactures to use aftertreatment systems extensively. In addition to pollutant emissions abatement, these devices have a noticeable impact on the wave pattern. This fact affects the muffler design criteria. All monolithic aftertreatment devices produces a damping effect because of the honeycomb structure and the narrow channels. However, this response is more marked in wall-flow diesel particulate filters (DPF) because of the alternatively plugged ends and the dissipative properties of the porous substrate. The main goal of this paper is to assess the transient fluid-dynamic behaviour of wall-flow DPFs using experimental and modelling techniques. The experimental data were gathered in clean and loaded conditions. The DPF was subjected to a variety of pressure excitations to characterise its transient behaviour in the time and frequency domains. Afterwards, the DPF response was evaluated under engine-like operating conditions in an unsteady flow gas stand. Once the main characteristics of the response were known, a non-linear gas-dynamics model was proposed for analysis and prediction. The model accounts for space and time gradients, combining the thermo-and fluid-dynamic solution with a model based on a packed bed of spherical particles that defines the meso-structure of the loaded substrate.

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Numerical Simulation of Diesel Particulate Filters in Exhaust Systems

Cited by 2 publications

References 8 publications

A transfer matrix approach for structural–acoustic correspondence analysis of diesel particulate filter

A transfer matrix approach for structural–acoustic correspondence analysis of diesel particulate filter

Experimental and computational approach to the transient behaviour of wall-flow diesel particulate filters

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