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Yoshimitsu ICHINO, Toru SAWAI, Takashi HAYAMI, Mitsushi OHMASA, Wataru ...
Article type: Article
Session ID: G0600-7-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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The purpose of this study is to develop "Semi-carbonized Bio-solid Fuels" used in the pulverized coal fired power plant. Experimental studies on formability of molded fuel and thermo-fluid phenomena of woody biomass are conducted to clarify the optimum molding conditions. The experimental results obtained are as follows. (1) Thermo-fluid phenomena of woody biomass: The occurrence temperature of thermo-fluid phenomena decreases as the molding pressure and the water content are increased. (2)Compression molding of semi-carbonized material: Rise in the molding temperature and the water content of woody biomass improve formability of molded fuel. It is found that the optimum molding conditions are closely related to the occurrence of Thermo-fluid phenomena of woody biomass.
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Kazui FUKUMOTO, Yoshifumi OGAMI
Article type: Article
Session ID: G0600-7-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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This paper presents the combustion model based on chemical equilibrium combined with an eddy dissipation concept model (CE-EDC) for reducing computational time; the model is validated by simulating a H_2-air turbulent diffusion flame. The obtained results were compared with Sandia H_2 Flame A. An advantage of the CE-EDC model is that computational time can be reduced using the chemical equilibrium method obtained from Look-up table which is prepared prior to the combustion simulation. The results obtained by the CE-EDC model are in good agreement with the reference data. With the combustion model built in this paper, the combustion products can be calculated without detail chemical mechanisms, and the accuracy of present model is in the same order of the EDC model.
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Hiroyuki Kosaki, Akio Yamashita, Atsumu Tezaki
Article type: Article
Session ID: G0600-7-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Intermediate species formed in the cool ignition stage of autoignition were evaluated by exhaust gas analysis with FT-IR in a test engine at hot ignition suppressed conditions. PRF(iso-octane/n-heptane) and NTF (toluene/n-heptane) were used as the fuels. The fuel consumption rate decreases with increasing iso-octane content in PRF and toluene content in NTF. HCHO generation rate increases with increasing iso-octane content in PRF but the opposide trend was found in NTF. These tendencies correspond to the difference in the detail reaction mechanism for PRF and NTF oxidation.
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Toshiya Okamoto, Bunpei Chanoki, Daisuke Fukuda, Hiroshi Gotoda
Article type: Article
Session ID: G0600-7-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Effect of non-equilibrium low temperature plasma on flame structure of lean premixed flame has been experimentally investigated in this work. With increasing an applied voltage up to 3 kV_<OP>, the flame stability limit remains unchanged. This means that the weak plasma does not affect the flame structure of lean premixed flame. In contrast, when the applied voltage exceeds 4 kV_<OP>, the value of equivalence ratio in flame stability limit decreases. The significant decrease in flame temperature allows the flame stability limit to be extended to lower equivalence ratio.
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Yohei OGAWA, Masaharu KOMIYAMA, Kenichiro TAKEISHI, Yuji IWASAKI
Article type: Article
Session ID: G0600-7-5
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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Lean premixed combustion is one of the most efficient techniques to reduce nitrogen oxide(NOx) emission. However, a lean premixed combustor has a risk of flashback. In this study, we present characteristics of flame propagating in a premixed burner with swirling flow in order to investigate unsteady flame behavior in a gas turbine premixed burner. During flashback, the flame propagating upstream was visualized with a high-speed camera. Moreover, we established the technique to measure the instantaneous flow fields in a model premixed burner using stereo PIV. As a result, characteristics of flame behavior propagating upstream were examined And it was found that a low velocity region existed in the vicinity of the flame tip and vortex core of swirling flow existed along the center axis with precession movement In this paper, the relationship between the flow field in the model premixed burner and the flame behavior was discussed in detail.
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Shigehiro KUWAMOTO, Masaya SUGIMOTO
Article type: Article
Session ID: G0600-8-1
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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General manufacturing method of high temperature gases is heating by the combustion of fossil fuel. However, the burning of fossil fuel is not preferred because of its emission problem of carbon dioxide. The use of arc plasma is examined as a new high temperature gas manufacturing method. The arc plasma is rotated by applied external magnetic field, which is expected to give the higher efficiency. The experimental results confirm that the rotating arc plasma is more effective for the gas heating compared with the normal straight arc plasma.
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Ryota Tsuzuki, Masaya Sugimoto
Article type: Article
Session ID: G0600-8-2
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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As a substitute method for oxide layer removal of metal surface by conventional chemical or mechanical ones, an application of vacuum arc has been studied, hi this method, the oxide layer of metal surface is removed by cathode spots which appear on the cathode surface in low pressure arc. It has been confirmed that flat surface oxide layer can be successfully stripped. In this research, an application of the vacuum arc for the oxide layer removal from a closed surface was investigated, which is entirely different case from the opened surface so far. A cylindrical metallic pipe was chosen for a cleaning object. A cylindrical copper anode was set coaxially in the cylindrical pipe and the removal of oxide layer from the inner surface of the pipe was attempted. Because the distance between the anode and the cathode surface was constant everywhere in this case, very efficient removal of oxide layer from the whole of inside of the metallic pipe can be expected.
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Naomi MATSUMOTO, Takeo YAMAMOTO, Masaya SUGIMOTO, Seiji KUMAGAI, Koich ...
Article type: Article
Session ID: G0600-8-3
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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A magnetically driven arc is produced by imposing an external magnetic field to a transferred arc. Its width is determined by the amplitude of its oscillatory motion. Its heat flux distribution can be controlled by the waveform of the magnetic field. This paper describes the theoretical examination of the magnetically driven arc.
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Keisuke Shoji, Masaya Sugimoto
Article type: Article
Session ID: G0600-8-4
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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In this study, zinc oxide film is formed on magnesium alloy surface with RF power oxygen plasma, trying to improve corrosion resistance remained electric conductivity. By using plasma, the impact energies of zinc and oxygen ions on the magnesium alloy surface can be controlled by change of bias voltage supplied to the magnesium alloy. As a result, it is expected that the properties of the formed film can be changed. Authors selected zinc oxide because of its good electric conductivity. However, the effect on the corrosion resistance has not been clarified yet. The electric conductivity and the corrosion resistance of the coated zinc oxide film were investigated under the various experimental conditions.
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Kohta MASUNAGA, Akira ONISHI, Hiroyuki ITO, Yuji NAKAMURA, Osamu FUJIT ...
Article type: Article
Session ID: G0600-8-5
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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The purpose of this study is to reveal the effects of DC electric field on carbon nanotube (CNT) synthesis. In flame synthesis method, it is considered that there are two effects of DC electric field which promotes CNT growth; i.e. generating ionic wind and enhancing catalytic activity. To distinguish the effect of DC bias on catalytic activity promotion, chemical vapor deposition (CVD) synthesis with high voltage DC bias is used in the present study. DC bias voltage is varied from -1.0 kV to +1.0 kV. It is confirmed that CNT growth is promoted by applying electric field. Moreover, it is suggested that catalytic activity may increase with increasing the intensity of electric field.
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Nobuhiro HIMENO, Kazuya NOZAKI
Article type: Article
Session ID: G0600-8-6
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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The authors are studying on a new shower cleaning system of removing environmental pollutant materials from an exhaust gas. In this report the decomposition of the collected chemical pollutant materials by photocatalysis was experimentally investigated by using ethylamine as a sample. The chemical reactor was composed of coaxial cylinders between which the packed bed of glass beads coated by photocatalyst was formed, and "Black Light" was located on the center of the cylinders to radially emit ultraviolet rays. The dependency of the decomposition rate of ethylamine was investigated on the radial thickness of the packed bed, the diameter of the glass bead and the flow rate. It was found from the experimental results that only the most inner layer of the packed bed is effective in photocatalysis reaction due to the fact that ultraviolet rays cannot go through the packed bed and irradiate only on the most inner layer.
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Article type: Appendix
Pages
App4-
Published: September 04, 2010
Released on J-STAGE: August 01, 2017
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