Analytical Method for Thermal Load of Piston Crown

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This paper describes the theoretical investigations about the thermal boundary conditions of heated parts in diesel-engine, from the side of heat conduction problems. In this case, it is very important, how precisely we can solve the differential equation with arbitrary boundary conditions. Therefore we propose two analytical methods for heat conduction problems, that is, conductive sheet analogous and numerical method. Lastly these methods are applied to the piston crown in diesel engine. So, this paper includes two main sections as follows: 1-a. In conductive sheer analogous metnod, the problems in (r-z) coordinate system is favora bly transferred to the problems in (r-θ) coordinate system, making use of some, assumptions, and the problems are solved with customary technique. 1-b. In numerical method, steady and unsteady heat conduction problems of plane and axisymmetric solids are solved by following process. Region is divided into trianqular shape elements and analyzed by well-known Heat Balanced method. As a developing technique of this method, thermal boundary conditions are directly determined by least square method. 2. For example of these methods, measured data of temperature about the piston crown in diesel engine are analyzed, and the relation of running condition and thermal boundary condition are determined.
公益社団法人日本マリンエンジニアリング学会の論文