著者
山谷 尚弘 見上 博 張 勁 平澤 良男 石原 外美 手﨑 衆
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
マリンエンジニアリング (ISSN:13461427)
巻号頁・発行日
vol.53, no.1, pp.140-146, 2018-01-01 (Released:2018-03-14)
参考文献数
10

Fuel injection pressure decreases in four-stroke diesel engines after extended operations. Poor combustion caused by the pressure drop is a serious problem that can lead to environmental pollution. Several factors have been considered to be behind mechanisms to decrease fuel injection pressure, but the details of such mechanisms are still unknown. Up until now, only limited numbers of studies have been conducted to define these mechanisms. In this study, we clarified that stress relaxation, buckling and metal fatigue of the pressure regulating spring in the fuel injection valve contribute to lowering injection pressure. We also found that the lowering of injection pressure causes early and prolonged injection in diesel engines.
著者
喜多野 一幸 羽入田 勝也 竹越 榮俊 澤田 昌俊 平澤 良男 小坂 暁夫
出版者
日本熱物性学会
雑誌
熱物性 (ISSN:0913946X)
巻号頁・発行日
vol.19, no.3, pp.142-146, 2005 (Released:2006-10-13)
参考文献数
7
被引用文献数
2 1

本研究では、高温蓄熱システムに使用される溶融硝酸塩と粒状マグネシアに関してそれぞれの熱伝導率及びそれらの混合物の有効熱伝導率を測定し、その熱伝導特性を検討した。熱伝導率及び有効熱伝導率は非定常細線加熱法により423Kから703Kの範囲で測定した。溶融硝酸塩と粒状マグネシアの混合物の有効熱伝導率は体積分率を変えて測定した。実験結果はMaxwellの式及びKunii-Smithの式から計算された値と比較し解析を行った。
著者
松本 浩二 塩川 康夫 岡田 昌志 川越 哲男 カン・チェドン 平澤 良男
出版者
一般社団法人日本機械学会
雑誌
日本機械学會論文集. B編 (ISSN:03875016)
巻号頁・発行日
vol.67, no.655, pp.804-809, 2001-03-25
被引用文献数
4

An ice storage is one of the ways of effective use of thermal energy. So, studies on a slush ice as thermal storage material have been done. We have also been studying on a suspension (slush ice) made of oil-water mixture with cooling and stirring. From our study result, it was found that a kind of additive having amino group (-NH_2) and silanol group (-SiOH) was essential to make the suspension with high IPF without adhesion of ice to a cooling wall. Moreover, formed ices in the suspension were dispersed and granular state and ices did not stick each other. In the present paper, we carried out experiments to clarify the characteristics of the suspension formation process. From the experimental results, it was found that the substance in the suspension was not ice but a compound consisting of ice and additive by a thermal analysis of fusion of the substance. Then, at very small depression of solidification point (about 7℃) all water of the mixture could be solidified by using the additive.