マリンエンジニアリング
Online ISSN : 1884-3778
Print ISSN : 1346-1427
ISSN-L : 1346-1427
47 巻 , 4 号
選択された号の論文の21件中1~21を表示しています
特集 年鑑号「2011年におけるマリンエンジニアリング技術の進歩」
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  • 経塚 雄策
    2012 年 47 巻 4 号 p. 549-553
    発行日: 2012/07/01
    公開日: 2013/12/20
    ジャーナル フリー
     Wind power is renewable and is regarded as one of the main countermeasures of global warming. Offshore wind power can harness more energy since offshore wind is stronger than onshore wind and is less turbulent above the sea surface. Furthermore,the ocean space has no bounds whereas there are many restrictions on the land. Recently,some studies report that the potential energy of offshore wind around Japan is many times greater than the country’s domestic demand for electric power. In this report,the current situation of R&D towards the utilization of offshore wind power is described for bottom mounted offshore wind turbines and for those on floating piles, structures or platforms.
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  • 佐々木 紀幸
    2012 年 47 巻 4 号 p. 572-578
    発行日: 2012/07/01
    公開日: 2013/12/20
    ジャーナル フリー
     Tidalpower has a potential for future electricity generation same as wind energyand solar energy. Difference is that tidal energy is more stable and predictable than wind energyand solar power. Among sources ofrenewable energy, tidal power has beentreated as a systemwith highcost and limited sites where we can find sufficiently high tidal energy. However, many recent technological developments improve its profitabilityby using these advantages compared with other renewable energies. To obtain the maximumefficiencyoftidal turbine, the conventional blade element momentum method (BEM) has been used and manycorrectionfactors were developed. Inthis paper, calculation methods whichhave been used inthe area of marine propellers are applied tothe designoftidal turbines and evaluated indetail based oncomparison withthe conventional BEM used in wind turbine field.
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  • 西田 哲也, 大原 順一, 堀田 将史, 中岡 勉
    2012 年 47 巻 4 号 p. 601-608
    発行日: 2012/07/01
    公開日: 2013/12/20
    ジャーナル フリー
     Performance analysis of a power system utilizing waste heat energy from marine engines was conducted with Trifluoroethanol (TFEA) as the working fluid. The power system performance analysis was carried out using two methods. One involved the evaluation of the Rankine cycle thermal efficiency, and the other is the objective function for inlet and outlet temperature difference of waste heat gas. In the latter method, the maximum net power was obtained by minimizing the heat transfer area of the heat exchangers. The minimum value of the objective function was about 4 m2/kW when the inlet temperature of waste heat gas was 450 degrees Celsius. The marine engine power output was obtained from a performance analysis of a power system utilizing waste heat energy.
  • 佐々木 秀次, 塚本 達郎
    2012 年 47 巻 4 号 p. 609-615
    発行日: 2012/07/01
    公開日: 2013/12/20
    ジャーナル フリー
     Particulate matter (PM) exhausted from diesel engines has several serious effects on human health and the environment. The strong health effects of the fine particles, in particular, have been reported recently. In this paper, the measurement of the particle size distribution was performed with a 4-stroke marine diesel engine. A three-cylinder high speed 4-stroke marine diesel engine (3L13AHS) was used as the test engine. The effect of the dilution ratio and the dilution air temperature in the dilution tunnel on particle size distribution was examined using Scanning Mobility Particle Sizer (SMPS) and Electrical Low Pressure Impactor (ELPI). The results show that the number of particles increases with an increase in the dilution ratio or the temperature of dilution air. The dilution ratio and the temperature of dilution air have a strong effect on the generation process of nuclei mode particles.
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