Karin, Preechar

Preferred name

Karin, Preechar

Alternative Name

Karin, P.

Karin, Preecha

Main Affiliation

School of Engineering

preechar.ka@kmitl.ac.th

Now showing 1 - 10 of 15

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EFFECT OF BIODIESEL ON COMPRESSION IGNITION ENGINE’S COMBUSTION BEHAVIOR AND PARTICLE EMISSION
(2020-11-11)
Tripatara, A.
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Karin, P.
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Phairote, W.
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Charoenphonphanich, C.
;
Masomtob, M.
Diesel Engines are widely known for a high compression ratio, which is proportional to the engine’s efficiency. The effect from direct injection of a diesel engine generates particulate matter (PM). PMs are mainly composed of Soot and Metallic Ash, which are harmful to human health. This research describes thermal efficiency, engine performance and combustion behavior at various load (20%, 50%, and 80%) and fuel (B7, B20, and B100) by using combustion pressure analyzer. The experimental results demonstrated that B100 has the highest ISFC and lowest ISEC for all test series owing to the highest indicated thermal efficiencies. Operating load and fuel are strongly proportional to heat release rate and ignition delay. The heat release rate of low load condition is retarded compare with medium and high load. Conventional diesel and biodiesel PMs were investigated by using Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The average size of ultrafine particles that obtained from the experiment are range of 50-500 nm and primary nanoparticle size of B7 and B100 are in range of 25-50 nm.
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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
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Thaeviriyakul, Poonnut
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Phairote, Watanyoo
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Saisirirat, Peerawat
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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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Influence of ethanol biodiesel blends on a diesel engine's efficiency and exhaust emission characteristics
(2022-01-01)
Kanokkhanarat, Phobkrit
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Karin, Preechar
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Depaiwa, Nattawoot
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Wongpattharaworakul, Veerayut
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Srisurangkul, Chadchai
The harm caused by polluted air occurs from dust, smoke, or soot. One of the main causes of pollutions is exhaust emission that comes from diesel engines of cars, trucks, buses, heavy machines, or generators for industrial because their thermal efficiency, torque, and performance are higher than the other engines. To reduce the emission from diesel engines, the fuel substitute for biodiesel which is made from based palm oil is one of the alternatives to use. So, the purpose of this paper is an experimental investigation of the engine performance, combustion characteristics, and smoke intensity of commercial biodiesel fuels (B10 and B20), pure biodiesel fuel (B100), and pure biodiesel blended with ethanol fuels (B100E5 and B100E10), which were performed at various loads (56, 84, 112, and 140Nm) and conducted at constant engine speeds (1000, 1500, and 2000 rpm). The experimental results show that pure biodiesel fuel (B100) and pure biodiesel blended with ethanol fuels (B100E5 and B100E10) have engine performance and combustion characteristics similar to commercial biodiesel fuels (B10 and B20). However, pure biodiesel fuels (B100) and pure biodiesel blended with ethanol fuels (B100E5 and B100E10) can reduce the emissions as the smoke intensity from commercial biodiesel (B10 and B20) is more than 50%.
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Spray visualization of biodiesel and diesel in a high pressure chamber
(2014-01-01)
Srichai, Prathan
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Chareonphonphanich, Chinda
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Karin, Preechar
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Chollacoop, Nuwong
The present research attempted to characterize fuel spray pattern, such as spray angle, spray penetration and their mixture formation by recourse to images analysis. Diesel and biodiesel were used to investigate via a single hole injector (solinoild type) in a constant volume high-pressure chamber. In this experimental study, the spray characteristics of diesel and biodiesel fuel were comparatively evaluated. Initial conditions were ambient temperature, ambient density of 21 kg/m<sup>3</sup>, injection durations varied from 0.5 and 1 ms and rail pressure of 400 and 800 bar. The series of images were captured by high speed video camera with resolution of 7,500 frames per second and shutter speed of 1/10,000 sec under Schlieren photography technique. The result showed the biodiesel spray penetration was longer than that of the diesel, and spray angle of biodiesel in start injection was larger than biodiesel. From the results, it can be concluded that the higher the density and viscosity of biodiesel, the stronger the effect on the spray mixture formation. © (2014) Trans Tech Publications, Switzerland.
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Oxidation kinetics of small CI engine’s biodiesel particulate matter
(2015-04-01)
Karin, P.
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Borhanipour, M.
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Songsaengchan, Y.
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Laosuwan, S.
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Charoenphonphanich, C.
Particulate matters (PMs) oxidation kinetics by Thermo-gravimetric analysis (TGA) was successfully studied. The chemical content percentage of PM can be divided by oxidation temperature zoning in three main regions which are moisture, unburned hydrocarbon (HC) and carbon. It is clearly observed that the amount of each region is strongly depending on engine operating condition, the amount of unburned HC in low load condition of the engine load are larger than that of high load condition. The calculated apparent activation energies of biodiesel PM oxidation are lower than that of diesel PM and carbon black because of unburned oxygenated molecule. The calculated apparent activation energy of biodiesel and diesel PMs oxidize with air is in the range of 147–157 kJ/mole and 153–165 kJ/mole, respectively. The results of this research would be used as basic information for design and develop removing process of particulate matter emitted from engine combustion which using in diesel and biodiesel fuels.
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VISUALIZATION OF SOOT NANOSTRUCTURE FROM ETHANOL BLENDED BIODIESEL USING ELECTRON MICROSCOPY IMAGE ANALYSES
(2022-09-14)
Thin, Myat Hsu
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Karin, P.
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Srilomsak, M.
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Po-Ngen, W.
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Saisirirat, P.
Characteristics of particulate matter from ethanol-blended biodiesel on the diesel engine in terms of nanostructure were investigated through electron microscopy. Commercial B20 fuel (20% palm and 80% diesel) was used as the baseline fuel and ethanol was blended at 5% and 10% with B20 fuel. The agglomerated particle size was reduced by increasing the weight ratio of ethanol. The average diameter sizes of the single primary nanoparticles of B20, B20E5, and B20E10 are about 20-40 nm while inter-planar spacing is about 0.404 nm, 0.383 nm, and 0.352 nm, respectively. The total fringe lengths of B20, B20E5, and B20E10 are approximately 521 nm, 470 nm, and 262 nm measured from the areas of 20 nm x 20 nm of primary nanoparticles.
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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
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Liu, Hai
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Thaeviriyakul, Poonnut
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Wai, Phyo
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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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Characterization of Biodiesel Particle Emission in Trapping and Regeneration Processes on Cordierite Diesel Particulate Filter
(2015-11-17)
Siricholathum, Komkla
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Karin, Preechar
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Charoenphonphanich, Chinda
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Hanamura, Katsunori
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Chollacoop, Nuwong
As well-known, the diesel engine has the highest thermal efficiency at the same load as compared with internal combustion engine but its disadvantage is particulate matter (PM) emitted to the atmosphere. The studies of this paper were divided into two parts. The first part studied the quantity of PM from the both diesel and biodiesel fuels at 80% load (2400 rpm) by the trapping process on diesel particulate filter (DPF) used in a partial flow dilution tunnel. The second part studied the regeneration process of PM under the flow rate of oxygen and nitrogen gas of 13.5 L/min with 10%, 15%, and 21% of oxygen gas. The result showed that amount of PM from biodiesel fuel was lower around two times than PM from diesel fuel. The duration in regeneration process of biodiesel's PM was shorter than diesel while increasing of oxygen percentage can reduce regeneration time.
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Experimental investigation of the influence of ethanol and biodiesel on common rail direct injection diesel Engine's combustion and emission characteristics
(2022-11-01)
Wai, Phyo
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Kanokkhanarat, Phobkrit
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Oh, Ban Seok
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Wongpattharaworakul, Veerayut
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Depaiwa, Nattawoot
This study aims to characterize the effect of oxygenated biofuels in diesel engine combustion, thermal efficiency, and emission by blending different percentages of ethanol and biodiesel with fossil fuel derived diesel. In this research, 5% and 10% by weight of bioethanol were added to commercial B10 (10% biodiesel and 90% diesel), B20 (20% biodiesel and 80% diesel) and B100 (100% biodiesel) and experimented on using a 3 L four-cylinder common rail diesel engine. The experiment was performed under three engine speeds of 1000 rpm, 1500 rpm, and 2000 rpm with three constant engine torques of 56 Nm, 84 Nm, and 140 Nm. The results show that ethanol-biodiesel-diesel ternary blended fuels are higher in premixed combustion pressure and net heat release rate (NHRR) peaks. The cumulative heat release of ethanol blended fuels is also higher for ethanol blended fuels. The fuel consumption increased with the ethanol and biodiesel percentage in the blended fuels due to the lower heating value while the brake thermal efficiency did not decrease. It was clearly observed that the particle emission could be reduced by more than 50% when ethanol and biodiesel percentage increased.
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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
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Patkacha, Atikan
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Thaeviriyakul, Poonnut
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Phairote, Watanyoo
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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.

Karin, Preechar

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