Relationship of In-Cylinder Gaseous and Particulate Concentration to Radiative Heat Transfer in Direct Injection-Type Diesel Combustion

摘要

The objective of the reported research was to investigate the relationship of radiation heat transfer to the in-cylinder species distribution in direct injection-type diesel engine combustion. In order to implement this objective, both the experimental and computational methods were employed during the course of the study. In the experiment, in order to obtain the in-cylinder species distribution at successive engine crank angles, a rapid sampling valve has been used on a laboratory-built single cylinder direct injection-type diesel engine. The engine for the data acquisiton was constructed basically by combining a reciprocating system of an ASTM gasoline engine and a newly constructed engine cylinder head. We encountered a series of problems in the engine requiring replacement of engine components. At the end, the engine was regarded unable to meet the need of operating for an extended period of time for data gathering. Consequently, it was decided to use a new single cylinder engine. In the computational work, a radiation heat transfer model was developed to predict spectral radiation heat transfer through the engine combustion chamber wall for given in-cylinder species distributions. The discovery of a new integral function, a new exact solution of blackbody functions, a new empirical equation of adiabatic flame temperature of fuel/air systems, an analytical solution of equation of radiation functions, a parametric analysis of diesel radiation heat transfer, etc. are reported.