Investigation of Quasi-steady State Heat Transfer at Intake Manifold in Actual IC Engine and Estimation of Outlet Air Temperature at Intake Port

実機エンジン吸気管の準定常熱伝達解析および吸入新気温度の推定

The amount of air into IC engine’s cylinders is affected by the heat transfer at the intake system, which is changed by the development of thermal boundary layer, the opening and closing of intake valve, and so forth. The authors' previous study developed the empirical equation for the intake manifold model assuming as the cycle-averaged quasi-steady state heat transfer. On the other hand, the present study also improved the newly empirical equation with the quasi-steady state heat transfer for the intake manifold of the actual IC engine. Consequently, the Nusselt number used in the newly empirical equation was expressed by using the Reynolds number, the Gratez number and the Strouhal number, which represents the effects of the intake air gas flow rate, the development of thermal boundary layer and the engine speed, respectively. In addition, the outlet air temperature at the intake port was estimated with the accuracy of maximum error of 5.6%, which was improved in comparison with the results obtained from the Colburn equation.本論文は,実機エンジンの吸気管にて温度測定を行い,吸気システムでの伝熱現象を検討した.その際,流れの非定常性および温度境界層の発達を考慮し,Nu数をRe数,Gz数,St数で表した実験式を導出した.また,熱力学モデルに基づきシリンダに吸入される空気温度を推定したところ,5.6%の誤差で推定可能であることがわかった.

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  • Accession Number: 01679810
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jul 26 2018 3:01PM