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Study for Higher Efficiency and Lower Emissions in Turbo Charged Small Gas Engine Using Low Caloric Biomass Model Gas

Doshisha University-Kenta Shiomi, Ryogo Kato, Eriko Matsumura, Jiro Senda
Yanmar Co.,Ltd-Ryoichi Hagiwara, Yuta Watanabe, Toru Nakazono
  • Technical Paper
  • 2019-32-0620
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
In recent years, depletion of energy resources and increasing CO2 emission have been concerned. As this solution, the use of biofuels from garbage is focused. In this research, higher efficiency and lower emissions in the gas engine for power generation using biomass gas are aimed. However, the biomass gas is low caloric value and the output is low and the combustion is unstable. Therefore, a turbocharged spark ignition gas engine is used as the test institution. As a result, it is found that combustion stability and high efficiency of biomass gas can be realized.
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The Experimental Investigation of the Performance and Emissions Characteristics of Direct Injection Diesel Engine by Bio-Hydro Fined Diesel Oil and Diesel Oil in Different EGR

Doshisha University-Annisa Bhikuning, Xin Li, Shoi Koshikawa, Eriko Matsumura, Jiro Senda
  • Technical Paper
  • 2019-32-0595
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Bio-hydro fined diesel (BHD) oil is known as a second generation oil made from bio hydro finning process. Biodiesel in the first generation is made from transesterification process and it has several disadvantages such as high density and increased the viscosity that can cause operational problems because can make some deposits in the engine. To overcome this, the second generation process of biodiesel has been modified from the first generation oil. BHD is made from the waste cooking oil by using the hydro finning process without the trans-esterification process. The results of BHD oil has nearly the same with diesel oil. BHD oil has low viscosity and high oxidation stability. Therefore, BHD oil can be used in the diesel engine without making any modifications in the engine.In this study, the comparison of performance and emissions characteristics from BHD oil, waste cooking oil, and diesel oil are investigated. The experimental conditions are varied for loads (low load and partial load) and exhaust gas circulations (EGR) are zero, 10, and 20%. The engine speed was constant at…
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Effects of Spray Internal EGR Using CO2 Gas Dissolved Fuel on Combustion Characteristics and Emissions in Diesel Engine

Doshisha University-Tomoyuki Mukayama, Yoshitaka Hattori, Eriko Matsumura, Jiro Senda
YANMAR Co., Ltd.-Masaki Kuribayashi, Go Asai
  • Technical Paper
  • 2019-32-0592
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
We have proposed the application of Exhaust Gas Recirculation (EGR) gas dissolved fuel which might improve spray atomization through effervescent atomization instead of high injection pressure. Since EGR gas is included in the spray of EGR gas dissolved fuel, it directly contributes to combustion, and the further reduction of NOx emissions is expected rather than the conventional external EGR. In our research, since highly contained in the exhaust gas and highly soluble in the fuel, CO2 was selected as the dissolved gas to simulate EGR gas dissolved. In this paper, the purpose is to evaluate the influence of the application of CO2 gas dissolved fuel on the combustion characteristics and emission characteristics inside the single cylinder, direct injection diesel engine. As a result, by use of the fuel, smoke was reduced by about 50 to 70%, but NOx reduction does not have enough effect. However, NOx emissions is reduced with external EGR, and the effect of NOx reduction is effective by combined the external EGR and the CO2 gas dissolved fuel.
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Study on Multicomponent Fuel Spray with High Injection Pressure

Doshisha University-Jiro Senda, Eriko Matsumura
Doshisha University Graduate School-Kohsuke Nishiura
  • Technical Paper
  • 2019-01-2282
Published 2019-12-19 by SAE International in United States
In previous study, the model for flash-boiling spray of multicomponent fuel was constructed and was implemented into KIVA code. This model considered the detailed physical properties and evaporation process of multicomponent fuel and the bubble nucleation, growth and disruption in a nozzle orifice and injected fuel droplets. These numerical results using this model were compared with experimental data which were obtained in the previous study using a constant volume vessel. The spray characteristics from numerical simulation qualitatively showed good agreement with the experimental results. Especially, it was confirmed from both the numerical and experimental data that flash-boiling effectively accelerated the atomization and vaporization of fuel droplets. However, in this previous study, injection pressure was very low (up to 15 MPa), and the spray characteristics of high pressure injection could not be analyzed. It is necessary to investigate the spray characteristics with high injection pressure for the application of multicomponent fuel to modern diesel engine.In this study, this model was validated by comparing with the results from experiment using constant volume vessel. The effects of initial…
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Improvement of Hybrid Scheme for WAVE-MTAB Model and Analytical Study of Diesel Spray Using Theory on the Spray Similarity

Department of Mechanical Engineering Combustion Engineering-Tsukasa Hori
Spray and Combustion Science Laboratory, Doshisha University-Motoki Hosogi, Eriko Matsumura, Jiro Senda
  • Technical Paper
  • 2019-01-2324
Published 2019-12-19 by SAE International in United States
In order to further improve the thermal efficiency of diesel engines, this report focuses on the influence of injection condition on similarity of similar spray. To accurately reproduce the diesel spray in our laboratory, the WAVE-MTAB model was developed, and improvements were made to switch between two breakup models. As a result, switching of the breakup model can be done according to the physical phenomenon, and it is considered that similar spray can be reproduced generally well when using theory on the spray similarity.
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Improvement of Combustion Characteristics and Emissions by Applying CO2 Gas Dissolved Fuel in Diesel Engine

Doshisha University-Tomoyuki Mukayama, Jumpei Yamamoto, Eriko Matsumura, Jiro Senda
YANMAR CO., LTD.-Masaki Kuribayashi, Go Asai
  • Technical Paper
  • 2019-01-2274
Published 2019-12-19 by SAE International in United States
We have proposed the application of EGR gas dissolved fuel which might improve spray atomization through effervescent atomization instead of high injection pressure. In this paper, the purpose is to evaluate the influence of the application of CO2 gas dissolved fuel on the combustion characteristics and emissions inside the single cylinder, direct injection diesel engine. As a result, by use of the fuel, smoke was reduced by about 50 to 70%. The amount of NOx was reduced at IMEP=0.3 MPa, but it was increased at IMEP=0.9 MPa.
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A Study on Higher Thermal Efficiency and Lower Cooling Loss in Diesel Engine

Doshisha University-Shoya Fujikawa, Naoyuki Arai, Seiya Iwamoto, Kohsuke Nishiura, Eriko Matsumura, Jiro Senda
  • Technical Paper
  • 2019-01-2283
Published 2019-12-19 by SAE International in United States
The purpose of this study is to achieve thermal efficiency improvement and cooling loss reduction of a diesel engine with a combustion concept of earlier evaporation, higher entrainment, and compact spray flame. In order to realize this concept, the paper focused on two-component fuel (nC5H12/nC10H22) with high evaporation. In this paper, the effects of two-component fuel on thermal efficiency and exhaust characteristics are examined by using single cylinder diesel engine. In addition, spray characteristics are revealed in an optically accessible chamber and combustion characteristics are revealed by using RCEM.
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Improvement of Spray and Combustion Process by Applying CO2 Gas Dissolved Fuel

Doshisha University-Tomoyuki Mukayama, Ryota Nishigami, Annisa Bhikuning, Eriko Matsumura, Jiro Senda
YANMAR CO., LTD.-Go Asai, Masaki Kuribayashi
  • Technical Paper
  • 2017-32-0046
Published 2017-11-05 by Society of Automotive Engineers of Japan in Japan
The CO2 gas dissolved fuel for the diesel combustion is effective to reduce the NOx emissions to achieve the internal EGR (Exhaust Gas Recirculation) effect by fuel. This method has supplied EGR gas to the fuel side instead of supply EGR gas to the intake gas side. The fuel has followed specific characteristics for the diesel combustion. When the fuel is injected into the chamber in low pressure, this CO2 gas is separated from the fuel spray. The distribution characteristics of the spray are improved and the improvement of the thermal efficiency by reduction heat loss in the combustion chamber wall, and reduce soot emissions by the lean combustion is expected. Furthermore, this CO2 gas decreases the flame temperature. Further, it is anticipated to reduce NOx emissions by the spray internal EGR effect.In this paper, the n-tridecane and CO2 gas were used as a basic fuel spray research, and shadowgraph photography and luminescence flame photography were conducted to measure the evaporation characteristics and flame characteristics of the fuel spray. In addition, chemiluminescence photography and luminous…
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Experimental Investigation of Superheated Fuel Spray Characteristics for D.I.S.I Engines

Doshisha University-Eriko Matsumura, Jiro Senda, Keitaro Imori, Yudai Sakai
Published 2017-03-28 by SAE International in United States
The flash boiling by fuel heating is a useful method to control the time spatial spray characteristics such as atomization of droplets, vaporization and air-fuel mixture concentration. It is one of the important phenomena for a direct injection gasoline engine (D.I.S.I) as a next generation powertrain. This report focuses on flash boiling spray using fuel heating. The purpose of this study is to understand its physical phenomena with scattered light method, schlieren photography, and Super High Spatial Resolution Photography (SHSRP). Fuel is iso-octane and injectors are a single hole nozzle and a multi hole nozzle. These are used for the basic phenomenon analysis. The influence on spray shape can be shown by schlieren photography. Spray droplet diameter and spray dispersion at the nozzle exit are observed by super high spatial resolution photography that is our original development technique. This is the first time that this SHSRP is applied to the measurement of the heating spray. As a result, spray dispersion and atomization were controlled by superheated degree and improved drastically by flash boiling. It was…
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Reduction of Reaction Mechanism for n-Tridecane Based on Knowledge of Detailed Reaction Paths

Doshisha University-Eriko Matsumura, Jiro Senda
Hokkaido University-Yoshimitsu Kobashi
Published 2016-10-17 by SAE International in United States
n-Tridecane is a low boiling point component of gas oil, and has been used as a single-component fuel for diesel spray and combustion experiments. However, no reduced chemical kinetic mechanisms for n-tridecane have been presented for three-dimensional modeling. A detailed mechanism developed by KUCRS (Knowledge-basing Utilities for Complex Reaction Systems), contains 1493 chemical species and 3641 reactions. Reaction paths during ignition process for n-tridecane in air computed using the detailed mechanism, were analyzed with the equivalence ratio of 0.75 and the initial temperatures of 650 K, 850 K, and 1100 K, which are located in the cool-flame dominant, negative-temperature coefficient, and blue-flame dominant regions, respectively. Based on knowledge derived from the reaction path analysis, a skeletal mechanism containing 49 species and 85 reactions, was developed and validated for representing ignition characteristics over a wide range of initial conditions computed using the detailed mechanism. The skeletal mechanism includes C3H7, C2H5, and CH3 as representative fragmental alkyl radicals, C7H14, C3H6, and C2H4 as representative alkenes, and C3H7CHO and CH2O as representative aldehydes. C3-series reactions beginning with O2…
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