Experimental Study on the Flow Field of Particles Deposited on a Gasoline Particulate Filter

Abstract

The abatement of particulate matter in gasoline vehicle exhaust has prompted the development of gasoline particulate filters (GPFs). The spatial distribution of the deposited particles inside a GPF has profound implications for its regeneration behavior, ash-induced aging, and multiscale modeling efforts. The connection cones will affect the flow into the monolith and the package structure needed to meet the system space requirements. In this paper, nonuniform rational B-splines (NURBSs) were applied to the cone design to optimize the flow uniformity and particle distribution inside a gasoline particulate filter. NURBS and conventional cones were manufactured using 3D printing, and the velocity profiles and pressure drops were measured under the loading of synthetic particles. The results shows that the cone shape will influence the pressure drop and the velocity profile, which is evaluated as the uniformity index. The test results indicate that better performance is achieved when using the NURBS cone, especially at low particle loads. The results also show that the cone shape (which determines the velocity profile) influences the particle deposition distribution, although the apparent pressure drops are similar. These results are important for exhaust aftertreatment system (EATS) design and optimization, where the NURBS cone can improve flow uniformity, which causes better particle deposition distribution and lower pressure drop.

Synergy Analysis of the Influence of the Connection Cone on the Thermal Distribution during Regeneration

“…The air flow rate into the front preheating pipe was controlled with a front pressure regulator, and the air entering the electric heating furnace was preheated to 400 • C, with a heating zone temperature of 500 • C. After passing through the monolith, which was loaded with particles, exhaust gas was discharged into the laboratory exhaust gas treatment pipeline through an exhaust pipe. Monoliths under particle loading were evaluated in repeated particle-loading tests [15]; the test setup is shown in Figure 3. After the monolith is loaded with particles, the monolith will be removed from the setup shown in Figure 3 and put into the electric heating furnace for the combustion test as described in the above.…”

“…The distance between points 6, 10, 14 and 2 was 20 mm. Four collection points were arranged across the front entrance end face, namely, points 3 (central axis position point), 7, 11 and To get the monolith loaded with particles, the particle aerosol should be mixed with the air from the laminar flow element in the ejector dilutor [15].…”

“…Three sections were designed along the axial direction of the monolith, and four or seven collection points were placed in each section. The properties of the monolith are listed in Table 1 [15]. 15, and they were uniformly distributed along the circumferential direction over 120°.…”

Influence of the Particulate Filter Use in the Spark Ignition Engine Vehicle on the Exhaust Emission in Real Driving Emission Test

“…For this reason, in September 2017, the EURO 6c emission norm came into effect for new engines and vehicles, which reduced the limit number of particulates to the same level as for vehicles with CI engines. Since then, this limit has been set at 6·10 11 Mu et al 2019]. Most of the vehicles were equipped with particulate filters in the exhaust system, as was the case with the tested vehicles [Honda 2018].…”

“…In order to carry out this process, first of all, a temperature of about 580°C is required, which in the case of gasoline engines is easier to achieve than in diesel engines [Kruczynski 2012, Mu et al 2019].…”