3D-CFD Code Based Numerical Analysis on Combustion Chamber Wall Surface Temperature Distributions in a Diesel Engine and their Effects on Heat Losses

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  • 三次元数値流体解析によるディーゼルエンジンの 燃焼室壁面温度分布の予測と熱損失に及ぼす影響の検討
  • サンジゲン スウチ リュウタイ カイセキ ニ ヨル ディーゼルエンジン ノ ネンショウシツヘキメン オンド ブンプ ノ ヨソク ト ネツ ソンシツ ニ オヨボス エイキョウ ノ ケントウ

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Wall surface temperature is assumed to be uniform and constant in 1D or 3D combustion analyses conducted in many previous studies. The present study predicts and discusses combustion chamber wall surface temperature distributions and their effects on combustion characteristics and the heat losses by reducing the computational time of a 3D-CFD code in combination with a 1D heat transfer model and applying a parallelized explicit ODE solver. As a result, the heat transfer calculation represented less than 1% of the total calculation time. The total calculation time was about 160 times faster than when calculated by the VODE solver with a single CPU thread on a desktop PC. The results indicate that the wall temperature and heat loss characteristics depend on the spray impingement on the walls rather than in-cylinder flow, like squish or swirl.

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