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Author: search.filters.author.Po-ngaen, Watcharin

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    Impact of particulate filters on biodiesel and diesel fuel: a comparative study of thermal efficiency and emissions
    (2026-06-01)
    Suteerapongpun, Teerapat
    ;
    Patkacha, Atikan
    ;
    Thaeviriyakul, Poonnut
    ;
    Phairote, Watanyoo
    ;
    Saisirirat, Peerawat
    This study investigated the influence of a partial-flow (P-DPF) and a full-flow (F-DPF) diesel particulate filter on the combustion and emissions of a light-duty diesel engine fueled with conventional diesel (B7) and pure biodiesel (B100). The engine was operated on a dynamometer under engine speeds of 1600–2000 rpm at 84–140 Nm loads. The results revealed that while B100 had higher mass-based specific fuel consumption (BSFC) due to its lower energy density, its overall brake thermal efficiency (BTE) was comparable to that of B7, indicating similar energy conversion efficiency. The use of DPFs resulted in a modest efficiency penalty, with brake thermal efficiency decreasing by 0.07% for the P-DPF and 2.62% for the F-DPF. The emissions analysis revealed the trade-offs associated with biodiesel use and DPF integration. While baseline B100 operation produced substantially higher nitric oxide (NO) emissions relative to B7, it consistently generated much lower smoke opacity. When averaged across all three aftertreatment configurations (no DPF, P-DPF, and F-DPF), B100 reduced smoke emissions by approximately 59% compared with B7. Additionally, the P-DPF and F-DPF proved effective at reducing smoke to half and near-zero levels, respectively, for both fuels.
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    Influence of ethanol-blended B7-diesel on in-cylinder combustion characteristic, engine thermal efficiency and emission of a 3L-compression ignition engine
    (2026-03-01)
    Suteerapongpun, Teerapat
    ;
    Thaeviriyakul, Poonnut
    ;
    Phairote, Watanyoo
    ;
    Saisirirat, Peerawat
    ;
    Po-ngaen, Watcharin
    This study investigated the effects of blending weight ratio of 5% and 10% ethanol (B7E5 and B7E10) with standard B7-diesel on the performance, combustion, and emission characteristics of a light-duty common-rail diesel engine. The engine was tested on a dynamometer across various speeds (1600–2000 rpm) and loads (84 and 112 Nm) to analyze in-cylinder pressure, thermal efficiencies, and exhaust emissions. Results indicated significant emission benefits, especially at high loads. The B7E10 blend reduced smoke intensity by approximately 75% and carbon dioxide emissions by 34% compared to the baseline B7. The performance analysis revealed a critical trade-off associated with the ethanol blends: while the inherent oxygen content in ethanol significantly improved the indicated thermal efficiency (ITE) through enhanced combustion, its lower viscosity simultaneously led to increased frictional losses. Consequently, these competing effects resulted in only a modest improvement in brake thermal efficiency (BTE) and comparable brake-specific energy consumption (BSEC) compared to the baseline B7. The primary objective is to identify the benefits and trade-offs associated with ethanol blending in biodiesel-based diesel fuels that are compatible with existing diesel vehicles.
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    The impact of a metallic partial-flow particulate filter on diesel engine combustion and emission characteristics using palm oil biodiesel blends
    (2024-02-01)
    Thin, Myat Hsu
    ;
    Liu, Hai
    ;
    Thaeviriyakul, Poonnut
    ;
    Wai, Phyo
    ;
    Oh, Ban Seok
    Reducing particulate emissions from diesel engines pose a significant challenge in developing countries due to increasingly stringent regulations for both new and older vehicles. While employing wall-flow filters have proven effective for new vehicles, older vehicles necessitate alternative approaches to particulate filtration without complex modifications. Partial flow filters exhibit advantages in such scenarios, characterized by their lack of external components, simplified design, minimal maintenance demands, and resilience to misfuelling. The present study mainly focuses on the evaluation of a partial flow diesel particulate filter (P-DPF) installed on a diesel direct injection compression ignition engine, operating on commercial biodiesel blends, specifically B10 and B20. According to the combustion analyses, the combustion pressure, temperature, and the heat release rate increased with the kinetic energy inside the residual gas molecules due to installation of the P-DPF system. This also resulted in higher indicated power as well as indicated thermal efficiency. However, brake-specific fuel consumption and brake-specific energy consumption, exhibited only a marginal increase, while brake thermal efficiency experienced a slight decrease of 0.65% in the case of B10 and 0.74% for B20 after the installation of the P-DPF system due to the friction loss by the filter backpressure. Furthermore, an incremental increase in exhaust backpressure was observed, ranging from 0.2 kPa at 1000 rpm and 56 Nm to 2.25 kPa at 2000 rpm and 140 Nm. An analysis of emissions limits showed a notable 65% reduction in soot emissions. Comparative analyses were conducted to assess the impact of P-DPF installation on a diesel engine without any manual changes. Ultimately, the partial flow filter (P-DPF) emerges as an effective initial measure in mitigating particulate matter emissions, particularly when employed in a retrofit exhaust after-treatment system.
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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
    ;
    Thaeviriyakul, Poonnut
    ;
    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.