小形直接噴射式ディーゼル機関におけるピストン表面への瞬時熱流束 : ガス流動と燃料噴霧の影響

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  • コガタ チョクセツ フンシャシキ ディーゼル キカン ニ オケル ピストン ヒ
  • Instantaneous Heat Flux on the Piston Crown of a Small Size Direct Injection Diesel Engine : Effects of Gas Flow and Fuel Spray Jet

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The effects of gas flow (swirl and squish) and fuel spray jet on local instantaneous heat flux on the piston crown of a small size direct injection diesel engine are experimentally investigated. Under the motoring operation, local heat flux on the piston with a flat crown increases with increasing local swirl velocity; and the local Nusselt number is found to be proportional to R^<0.636gt;_e, where R_e=2πrv_<θ,r>/ν with v_<θ,r> the local swirl velocity at radius r andνthe kinematic viscosity. While for the piston with cavity, local heat flux is strongly influenced by squish flow. Under the firing operation, it is observed that the heat flux at the position where the fuel spray jet collides is mostly determined by the fuel spray jet.

rights: 社団法人日本機械学会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110002400437/

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