Srilomsak, Mek

Preferred name

Srilomsak, Mek

Alternative Name

Srilomsak, M.

Main Affiliation

School of Engineering

mek.sr@kmitl.ac.th

Now showing 1 - 6 of 6

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Effect of Metallic Microfiber Flow Through Diesel Particulate Filter System on Diesel Engine’s Particle Emission Physicochemical Characteristics
(2023-03-01)
Oh, Ban seok
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Thaeviriyakul, Poonnut
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Phairote, Watanyoo
;
Srilomsak, Mek
;
Charoenphonphanich, Chinda
It is well known that particulate matter (PM) from diesel compression ignition engines is harmful to the environment and to human health. To reduce engine PM emissions, exhaust after-treatment systems are utilized. A basic high-performance system can be composed of a diesel oxidation catalyst (DOC) and diesel particulate filter (DPF). This study used a system composed of a DOC and a partial flow DPF. Partial flow refers to how only a portion of the exhaust gas is filtered using metal fibrous filters instead of the full flow using ceramic filters. The PM deposited on the side wall of the stages of the system was investigated with respect to elemental composition, morphology, and nanostructure. This was to determine the effect of each component on the PM. The elemental composition analysis found traces of the engine lubricant oil in the PM collected before entering the DOC. This was then eliminated by the DOC and the remaining PM was not significantly impacted by the exhaust after-treatment system. The morphology and nanostructure show an interesting relationship where the size of the single primary particles increased while the graphitic nature of the carbon in the PM seemed to decrease. This can be explained by the simultaneous nature of partial trapping and partial oxidation that occurs in the partial-flow DPF. The emission measurements of opacity, temperature, CO<inf>2</inf>, NO, and O<inf>2</inf> from each position also support this.
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Effect of a retrofitted metallic microfiber partial flow diesel particulate filter on a light duty diesel vehicle particle emission characteristics
(2024-02-01)
Mon Phyo, Mi Zwe
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Phairote, Watanyoo
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Srilomsak, Mek
;
Charoenphonphanich, Chinda
;
Masomtob, Manop
This study was conducted two distinct experiments, using a light-duty diesel vehicle at various engine speeds and loads as well as the new European driving cycle (NEDC) comparing commercial diesel fuel (B7) and pure biodiesel (B100). The NEDC involves a combination of urban and extra urban driving conditions. It aims to study a diesel vehicle's thermal efficiency as well as its gaseous and particulate matter (PM) emissions. This involves comparing results with and with no diesel oxidative catalyst (DOC) and a partial flow diesel particulate filter (PDPF) system. The surface morphology, micro- and nanostructure of a diesel vehicle's PM were also examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) to determine nanostructural and dimensional changes after mounting a DOC-PDPF system. Comparison of B7 and B100 combustion showed that B100 had around 1 % increase in brake thermal efficiency (BTE) at 1500 and 2000 rpm compared to B7 since B100 is a more oxygenated biofuel. At 2500 rpm, similar BTE values were observed. Introduction of a DOC-PDPF system resulted in an approximately 1 % BTE reduction for both fuels. This was due to greater friction losses caused by backpressure from the DOC-PDPF system. Increased exhaust backpressure was progressive, ranging from 1 kPa at idle speed to 6 kPa at high engine speeds for both tested fuels. The DOC-PDPF system respectively minimized PM emissions and particle numbers (PNs) by more than 50 % and 35 % for B7 and 71 % and 31 % for B100. These results are average values under the various phases of NEDC testing. A 30 % decrease in PM and a 44 % reduction in PNs under the overall test cycle were found when B100 was tested compared to B7. The soot primary particle size was reduced from 34.69 to 29.08 nm and the carbon fringe length diminished from 1.25 to 0.949 nm at different pre- and post-DOC-PDPF locations. This was due to partial oxidation on the surfaces of the PDPF metallic microstructure. PM undergoes simultaneous partial oxidation after passing through the DOC-PDPF system, as confirmed by TGA analysis.
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Reduction of Diesel Engine's Particulate Matters using Retrofit CeO2Diesel Oxidative Catalyst and Partial Flow Diesel Particulate Filter System
(2022-01-01)
Liu, Hai
;
Charoenphonphanich, Chinda
;
Karin, Preechar
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Srilomsak, Mek
;
Srimanosaowapak, Sompong
In this research, CeO2 was chosen for the DOC catalyst. Moreover, a partial-flow DPF was installed after DOC. The exhaust gas experiment was conducted at 20% - 50% engine load varying 1000,1500, and 2000 rpm of engine speed. The research results show that NOx reduced around 25% with CeO2 DOC and DPF systems at higher engine load. On the other hand, particulate matters decrease around 65% after CeO2 DOC and DPF systems. Furthermore, CO and HC amount were substantially reduced after applying after-treatment systems. According to fuel consumption, BSFC, and BTE results, the after-treatment system has no significant impact on engine performance.
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Experimental investigation of metallic partial-flow particulate filter on a diesel engine's combustion pressure and particle emission
(2023-09-01)
Mon Phyo, Mi Zwe
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Wai, Phyo
;
Thin, Myat Hsu
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Oh, Ban Seok
;
Phairote, Watanyoo
The study aims to present the combustion and exhaust behaviors of a 3 L, four-cylinder common rail diesel engine with three different kinds of conventional B7 diesel fuels with and without a platinum diesel oxidation catalyst (DOC) system and non-catalytic partial flow through a diesel particulate filter (P-DPF). Testing is performed under the three different operating conditions, idle to medium engine loading at 1000, 1500, and 2000 engine revolutions per minute with four different engine torques of 84, 112, 140 and 160 Nm. The surface morphology and agglomerate size of particulate matter (PM), single primary particle analysis as well as the fringe length of the carbon crystallite structure were also examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive x-ray spectroscopy (EDS) to achieve a better understanding through image processing. The P-DPF system does not have a significant effect on an engine's in-cylinder combustion characteristics and brake thermal efficiency. The diesel engine's particle emissions are reduced by trapping them on the metallic micro-fibers of a P-DPF. CO<inf>2</inf>, NO, and O<inf>2</inf> levels show that the carbonaceous particle emissions on the micro-structure of the P-DPF passively react with NO<inf>2</inf> and O<inf>2</inf>. Consequently, diesel engine particle emissions can be reduced by around 50% using a P-DPF system under the experimental conditions of the current study.
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In-cylinder combustion and emission characteristics of a 3L compression ignition engine using pure biodiesel fuel blended with 5% ethanol
(2026-04-01)
Suteerapongpun, Teerapat
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Huynh, Trung An
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Aung, Sonekhar Jarring
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Thin, Myat Hsu
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Thaeviriyakul, Poonnut
This study investigates the combustion performance, efficiency, and emission characteristics of four fuel blends—B7 (7% biodiesel), B100 (pure biodiesel), B100E5 (95% biodiesel + 5% ethanol), and B100E10 (90% biodiesel + 10% ethanol)—in a light-duty diesel engine. Experiments were conducted on an engine dynamometer under varying loads (84, 112, and 140 Nm) and speeds (1600, 1800, and 2000 rpm) to assess in-cylinder pressure, temperature, engine efficiencies, and emissions. The results demonstrate that the oxygenated B100Es blend achieves superior combustion performance, exhibiting higher peak in-cylinder pressures and temperatures than conventional B7, attributable to enhanced oxygen availability, which promotes more complete fuel oxidation. This translates to an improvement in indicated thermal efficiency despite its lower calorific value relative to B7. B100 demonstrates distinct advantages in mechanical efficiency at higher engine speeds, attributed to its superior lubricity. The study provides quantitative evidence that a strategic blend of biodiesel with ethanol can effectively balance the often-competing objectives of combustion efficiency and emission reduction in modern diesel engines. The average brake thermal efficiencies of B7, B100, B100E5, and B100E10 are approximately 35.8, 36.4, 37.7, and 37.2%, respectively. Additionally, the average smoke intensities of B7, B100, B100E5, and B100E10 are approximately 0.211, 0.075, 0.042, and 0.038%/kW, respectively.
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CHARACTERIZATION OF FOUR BALL METALLIC WEAR MECHANISMS USING SCANNING ELECTRON MICROSCOPY
(2022-09-14)
Phyo, Mi Zwe Mon
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Karin, P.
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Khamsrisuk, P.
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Srilomsak, M.
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Charoenphonphanich, C.
Nowadays, lubricants play an important role in several automotive industries around the world because they reduce friction and wear on engines moving parts such as piston ring, cylinder liner and valve control systems of compression ignition engines. The aim of this research was to investigate the impact of bio-oil (palm oil) on metallic wear. The tribological test was conducted using a four-ball tribometer as indicated by engineering testing standard ASTM (D4172) under the conditions of 392 N applied load, 75°C and the period of 60 minutes. These four ball surfaces were observed by using 3D Optical Microscope (OM) and Scanning Electron Microscope (SEM) analysis. According to the four-ball wear test, the comparison of average wear scars diameter between two different types of bio-oil and SAE 0W30 engine oil were investigated. Furthermore, wear scar depth from 3D microscope and SEM images of different magnification were compared in the viewpoint of wear mechanism analysis.
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Srilomsak, Mek

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