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RISS 인기검색어
- 검색키워드
- 저자 : Manida Tongroon (검색결과 4 건)
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Manida Tongroon,Yanuandri Putrasari,Sakda Thongchai 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.1
The effect was investigated of ethanol together with biodiesel in tri-blend fuels on the combustion characteristics of a compression ignition engine. In addition, the sole influences of ethanol and biodiesel were clarified and the operating conditions (engine speed and load) were evaluated for their contributions to the effects of ethanol and biodiesel. Because this research aimed to bridge the gap between research and implementation, the biodiesel concentration in commercial fuel currently available was the first criterion for the blend ratio. Therefore, amounts of 3, 7, or 10 % biodiesel in the biodiesel-diesel blends (B3, B7, and B10) were mixed with ethanol. Phase stability was the second factor used to determine the suitable ethanol concentration in the tri-blend. Additionally, the ratios of each blend were compared regarding the effect of ethanol and biodiesel alone, as well as their combination. Finally, four different ratios of ethanol and biodiesel—B7, 5 % ethanol in B3 (B3E5) and in B7 (B7E5), and 10 % ethanol in B10 (B10E10)—were investigated in a four-cylinder commercial diesel engine with varying engine speeds and loads. The results showed that ethanol significantly retarded the start of combustion, while the ignition was noticeably advanced by biodiesel. The high cetane value of biodiesel was the primary factor to accelerate the chemical reaction, while the high heat of vaporization of ethanol was the main contributor to decelerating the physical phenomena during the auto-ignition process. Therefore, adding biodiesel as the emulsifier in an ethanol-diesel emulsion could compensate for the delayed ignition due to the properties of ethanol. As a result, the combustion levels of B7E5 and B7 were similar at low engine speeds. The ignition delay of B10E10 was the same as for B3E5 but later than for B7. The effects of ethanol and biodiesel were promoted by the operating conditions. An increase in the engine speed intensified the effect of ethanol on the ignition delay. Even a small amount of ethanol in the blend delayed combustion substantially. Furthermore, the engine speed strengthened the influence of the engine load. For the high load condition, puffing (the micro-explosion resulting from the emulsion blend) seemed to occur and to accelerate the combustion of the ethanol blend. Due to slight changes in the combustion behavior for all operating conditions, B7E5 was considered a highly promising fuel based on this study.
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Sombat Marasri,Pop-Paul Ewphun,Prathan Srichai,Chinda Charoenphonphanich,Preechar Karin,Manida Tongroon,Hidenori Kosaka 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.3
This paper investigates the effects of Hydrotreated vegetable oil (HVO)-diesel blends on combustion characteristics under various ambient oxygen concentrations and ambient temperatures in a constant volume combustion chamber (CVCC). Combustion characteristics were presented in terms of heat release rate, ignition delay and integral heat release. The shadowgraph images of spray combustion were presented for spray development and combustion progress. The experiment was carried out on CVCC under constant injection pressure and energizing time. The synthetic gas with varied oxygen concentrations between three discrete values from 21, 15 and 10 % to simulate EGR on engine conditions. The ambient temperatures were varied at 1100, 900 and 700 K to study the effects of ambient temperatures. Four different fuels were tested: commercial diesel, commercial diesel-HVO blends and HVO with the single-hole injector. The results showed that decreasing ambient oxygen concentration to 10 % resulted in 13.42 % lower heat release rate and 13.89 % lower integral heat release. This also extended ignition delay. Decreasing ambient temperature resulted in longer ignition delay with higher peak heat release rate. Increasing HVO showed 6.43 % shorter ignition delay compare to diesel due to higher cetane number. The shadowgraph images showed that HVO has better evaporation 0.7 to 0.9 ms after injection due to its lower density, viscosity and distillation temperature at T90.
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INJECTION CHARACTERISTICS OF PALM METHYL ESTER BLENDED WITH DIESEL USING ZUECH’S CHAMBER
Prathan Srichai,Pop-Paul Ewphun,Chinda Charoenphonphanich,Preechar Karin,Manida Tongroon,Nuwong Chollacoop 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.3
This research attempts to characterize the injection of palm biodiesel blended with diesel in a Zuech’s chamber. Thailand conventional diesel (mandated blend of biodiesel at 5 % or B5), palm biodiesel (B100) and four other biodiesel blends ratios (B20, B40, B60 and B80) were investigated with single hole injector of 140 and 200 μm diameters, injection pressure of 40 MPa to 160 MPa, constant back pressure of 4.5 MPa and energize time of 2.5 ms. The results show that increasing biodiesel blending ratios leads to longer injection delay, larger injection pressure drop, smaller injection quantity discharge coefficient (Cd) and shorter injection duration. With increasing biodiesel blending ratio, high Cavitation number from biodiesel viscosity decreases Reynolds number. Increasing injector diameter from 140 μm to 200 μm has reduced injection delay, increased fuel injection quantity, discharge coefficient and remaining injection duration. The increasing of injection pressure were improve, injection delay, injection duration, injection quantity and discharge coefficient until injection pressure 120 MPa. In addition at injection pressure over 120 MPa are decrease injection quantity and discharge coefficient, it effect form the cavitation phenomena. Increasing of viscosity, density, Bulk modulus and sound velocity were effect to increase injection delay, with reduce injection quantity, injection duration and pressure drop during injection process.
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