The application of a transformational zone method to the calculation of radiation heat transfer inside a piston-cylinder system

A radiation heat transfer analysis has been formulated for the space inside an internal combustion engine cylinder using the principles of the Hottel zone and transformational zone methods. The space analyzed has a variable length resulting from the piston movement. The analysis presented here is for radiation in piston-cylinder systems of known temperatures of radiation gas, and internal surfaces of cylinder, head, and piston. Radiative emissions of the radiation gas in the shape of rings were determined on the basis of Stasiek's principle of surface transformation. The results obtained demonstrate the present approach satisfactorily, both qualitatively and quantitatively. Moreover, the division of the analyzed volume into infinitely small elements along the axial direction has significantly simplified the calculations in comparison with the conventionally employed classical Hottel zone method.