Departmental Bulletin Paper 火花点火機関燃焼室壁面における熱伝達率算出式の一般性の検討
Investigation of Generality of Estimation of Heat Transfer Coefficient on Combustion Chamber Wall Surface of S.I. Engine

戌亥, 太一  ,  長瀬, 慶紀  ,  友松, 重樹  ,  高濱, 智洋  ,  木村, 正寿

44pp.173 - 178 , 2015-07-31 , 宮崎大学工学部
In order to solve an environmental problem, it is necessary to improve the thermal efficiency of an internal combustion engine. There is heat loss with an engine, which accounts for about 40% of thermal energy occurred in an engine. Therefore, in order to calculate the heat transfer from burned gases to the combustion chamber wall surface, it is necessary to evaluate the heat transfer coefficient on the combustion chamber wall surface. However, it is difficult to find the heat transfer coefficient. Therefore, the equation is required to estimate the heat transfer coefficient with generality. In this study, we made the T type thermocouple which is said the Cu-Con heat flux probe, and measured heat flux on the combustion chamber wall surface by setting the Cu-Con heat flux probe at various places (cylinder head, cylinder liner and piston head) of the combustion chamber of the engine (TRE-1). In addition, in order to confirm generality, heat flux was measured at the cylinder head and cylinder liner of the different engine (R52). Furthermore, the both measurement results were expressed by the number of no dimensions of Nusselt number (Nu) and Fourier number (Fo), and were compared every measurement point. As a result, the similar tendency was confirmed on both cylinder liners.

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