Research Papers: Internal Combustion Engines

Experimental Analysis of Sudden Pressure Increase Phenomenon by Real-Time Internal Observation of Diesel Particulate Filter

[+] Author and Article Information
Rui Fukui

Department of Mechanical Engineering,
The University of Tokyo,
Tokyo 1138656, Japan
e-mail: fukui@hnl.t.u-tokyo.ac.jp

Yuki Okamoto

Department of Mechanical Engineering,
The University of Tokyo,
Tokyo 1138656, Japan
e-mail: okamoto@hnl.t.u-tokyo.ac.jp

Masayuki Nakao

Department of Mechanical Engineering,
The University of Tokyo,
Tokyo 1138656, Japan
e-mail: nakao@hnl.t.u-tokyo.ac.jp

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 26, 2016; final manuscript received February 18, 2016; published online April 12, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(10), 102803 (Apr 12, 2016) (7 pages) Paper No: GTP-16-1036; doi: 10.1115/1.4033061 History: Received January 26, 2016; Revised February 18, 2016

As a way of reducing the amount of particulate matter (PM) contained in the exhaust gas, diesel particulate filter (DPF) is widely used. To keep the condition of DPF normal and effective, estimation of the amount of PM deposits in the DPF is important. The estimation is mainly conducted based on the value of pressure drop across the DPF. Occasionally, the value of the pressure drop rises suddenly and it leads to overestimation of the amount of PM deposits. In order to elucidate the cause of the sudden pressure drop increase phenomenon, this paper first reveals the engine operating conditions which invoke this phenomenon. The authors also have developed a visualization method to realize the wide-perspective internal observation of the DPF. The observation experiment has been conducted with a commercial engine and DPF under the revealed conditions. Experimental results make clear that the phenomenon is caused by PM deposit layer collapse and channel plugging.

Copyright © 2016 by ASME
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Fig. 1

Schematic diagram of PM layer behavior

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Fig. 2

DPF internal visualization device in previous work [6]

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Fig. 3

Newly developed DPF internal visualization device

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Fig. 4

DPF visualization processes (1) cut and grind DPF, (2) insert spacer and coat with adhesive material, (3) adhere glass, and (4) infill sealant

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Fig. 5

Experimental system

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Fig. 6

Snapshot of visualization experiment

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Fig. 7

Time series graphs of acquired data. Pressure drop across the DPF increase suddenly.

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Fig. 8

Offline image of observation surface indicating positions of PM layer collapses

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Fig. 9

Images captured from movie indicating the phenomenon of the PM layer collapse

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Fig. 10

Small circles indicate the time when the sudden pressure drop increase phenomenon occurs

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Fig. 11

Images of inflow channels acquired by fiberscope



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