NUMERICAL STUDY OF THE TURBULENT HEAT-TRANSFER IN A MOTORIZED ENGINE UTILIZING A 2-BOUNDARY METHOD-GRID GENERATION TECHNIQUE

An algorithm for a multidimensional numerical solution was developed to predict the turbulent flow field and heat flux in the cylinder of a reciprocating engine. The two-boundary method-grid generation technique associated with cubic interpolation was used to map the complex physical domain onto an ideal rectangle for every time step. Hence, the metrics of the coordinate transformation could be obtained by direct analytic differentiation, and the rapid solution time,vas another advantage. The heat and flow patterns in the cylinder were vividly visualized by means of the contour maps of velocity vectors and isotherms. The effects of piston crown shape on in-cylinder turbulent heat flux were investigated. Comparison was made of present heat flux results and earlier experimental and numerical results.