DSpace-CRIS

Now showing 1 - 3 of 3

Some of the metrics are blocked by your
consent settings
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
;
Huynh, Trung An
;
Aung, Sonekhar Jarring
;
Thin, Myat Hsu
;
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.
Some of the metrics are blocked by your
consent settings
Particle emission and thermal efficiency analysis of a diesel vehicle using biodiesel and a platinum metallic partial-flow particulate filter
(2025-01-01)
Dang, Huy Quang
;
Phyo, Mi Zwe Mon
;
Thaeviriyakul, Poonnut
;
Cosh, Plan Teekatasn
;
Srilomsak, Mek
Harmful emissions from diesel vehicles, particularly unmodified ones, pose significant concerns for human health and the environment, underscoring the urgency to address these issues. This study investigated the effects of commercial fuels, B10, B20, and biodiesel B100, used with a metallic partial-flow catalyzed diesel particulate filter (P-CDPF), on a light-duty unmodified diesel vehicle's thermal efficiency and emissions characteristics. The initial test was conducted on a chassis dynamometer to measure the fuel flow rates at three different engine speeds, 1500, 2000, and 2500 rpm, with four loads, 84, 112, 140, and 160 Nm. This was done to evaluate brake-specific fuel consumption and brake thermal efficiency under steady-state conditions. The second test followed the new European driving cycle to examine emission factors of regulated pollutants under both urban and highway driving conditions. The results indicated that BSFC values increased with the biodiesel ratio in the blends, attributed to lower heating values. However, higher oxygen contents with increasing biodiesel ratios led to more complete combustion and improved brake thermal efficiency. Installation of a P-CDPF had a minimal impact, resulting in less than a 3.4% increase in the BSFC and a 1% decrease in brake thermal efficiency across all tested fuels, owing to its relatively low pressure drop. Increasing the biodiesel ratio from B10 and B20 to B100 resulted in reductions of up to 32% of particulate mass and 45% of particulate number in vehicle emissions. P-CDPF installation further reduced particulate mass by over 60% and particulate number by 36% across all tested fuels, demonstrating its effectiveness in trapping and passively oxidizing particulate matter. Furthermore, the P-CDPF significantly reduced harmful gases with addition of a catalytic coating. A combination of a P-CDPF and commercial biodiesel fuels emerges as an effective solution for reducing regulated emissions from unmodified diesel vehicles.
Some of the metrics are blocked by your
consent settings
Characterization of biodiesels and tire derived particulate matters in morphology and nanostructure
(2022-01-01)
Oh, Ban seok
;
Karin, Preechar
;
Srilomsak, Mek
;
Chonvasin, Kritin
;
Po-ngen, Watcharin
Particulate Matters (PM) are known to be dangerous to human health and the environment. Regulations have been set to limit PM levels from vehicles, including compression ignition engine vehicles. The effect of increasing biodiesel content in the fuels has been investigated with respect to the PM using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). PM from tire emissions were compared against diesel PM using SEM, energy dispersive x-ray spectroscopy (EDS), TEM, particle size analysis, x-ray diffraction (XRD), and Raman spectroscopy (RS). The SEM and TEM show that increasing the biodiesel content decreased the size of the PM agglomerate particles, primary particles, and fringes. The EDS, RS, and XRD show that Tire PM are mostly carbon with silicon, calcium, zinc, and other various trace elements. They also allow comparisons with diesel PM for the carbon nanostructure. The particle size analysis shows that Tire PM are generally larger than engine derived PM. The TEM showed that the nanostructure of the carbonaceous Tire PM was the same fringe structure as the engine derived PM. The Tire PM was successfully characterized using similar methods as engine derived soot. There is strong relationship between the increasing of biodiesel content and reduction of agglomerate size, primary particle size and average fringe length.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results