Proposal of Wall Heat Transfer Coefficient Applicable to Spray-wall Interaction Process in Diesel Engines


An estimation of heat-loss through the wall from in-cylinder gas is a key to achieve higher thermal efficiency of diesel engines. In the first report of a series of studies, a formula of heat transfer coefficient, which plays a key role in heat-loss processes, was explored by applying ‘‘Similarity of Spray Characteristics’. It was clarified that the dependency of representative velocity on heat transfer coefficient is a half level of that of the conventionally used Woschni formula.ディーゼルのさらなる熱効率向上のためには,エンジン筒内から壁への熱損失の予測が重要になる.第1報では,熱損失に大きく影響する壁面熱伝達率の式を,噴霧相似理論を用いて実験的に同定した.その結果,従来のWoschni式と比べ,熱伝達率に対する代表速度の依存性を示す指数が約半分になることを示唆した.


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  • Accession Number: 01689422
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Dec 20 2018 3:33PM