Journal of the Japan Institute of Energy
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ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 97 (2018), No. 3

  • Influence of Low-Frequency Plasma on HCCI Combustion under EGR and Supercharging Conditions

    pp. 64-69

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    DOI:10.3775/jie.97.64

    Homogeneous Charge Compression Ignition (HCCI) has attracted much attention as a combustion system for internal combustion engines because it is capable of achieving high efficiency and clean exhaust emissions. However, it is difficult to control the ignition timing of HCCI engines and their range of stable operation is limited to low loads. Approaches to resolving these issues include supercharging and the application of exhaust gas recirculation (EGR), which are effective techniques for moderating combustion during high load operation. However, one drawback of EGR is that it tends to cause unstable combustion. Therefore, the idea of applying Low-Frequency plasma to assist combustion was investigated as a method of stabilizing combustion while still maintaining a high EGR rate. A self-excited pulse generator configured with an inverter circuit was used in this study to apply high-voltage alternating current for forming a Low-Frequency plasma discharge between electrodes inserted into the combustion chamber. The effect of this plasma discharge on HCCI combustion was examined. The results showed that the Low-Frequency plasma assist had the effect of stabilizing combustion under conditions where combustion normally becomes unstable. It was found that this method made it possible to achieve stable combustion at higher engine loads.
  • Effects of Pt-loading on Formation and Visible Light-Induced Photocatalytic Activity of Bismuth Titanate

    pp. 70-76

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    DOI:10.3775/jie.97.70

    Pt/TiO2-Bi2O3 test catalysts were prepared by impregnating Pt on the sol-gel derived TiO2-Bi2O3 to give these testpieces high photocatalytic activity under visible light irradiation. The optimum Pt support content and TiO2 content were observed in the ranges 0.05-0.3 wt% and 17-28 wt%, respectively in the photocatalytic activity for Methylene Blue (MB) degradation on Pt/TiO2-Bi2O3. Specifically, those 0.1Pt/17TiO2-83Bi2O3, 0.2Pt/23TiO2-77Bi2O3 and 0.3Pt/28TiO2-72Bi2O3 samples showed relatively higher photocatalytic activity for the MB degradation. The results were closely related to (1) the restriction of recombination of the photo-induced electron and hole pairs by Pt, and (2) the presence of bismuth titanate with such high Ti content as built up by Pt.
  • Table of Contents (in English)

    p. 9703tce_1

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    DOI:10.3775/jie.97.9703tce_1

  • Table of Contents (in Japanese)

    p. 9703tcj_1

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    DOI:10.3775/jie.97.9703tcj_1

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