The Calculation In Performance And Emission For PA6-280 Diesel Engine

In order to get more real information of combustion model, quasi-dimensional combustion in diesel engine is used.This model is a new one in which a lot of modify is done on the base of Hiroyasu model. The new one is better than Hiroyasu model in speed, accuracy and convergence of calculation.Each spray is divided into many packages in this model (in terms of PA6-280 there are 390 packages). Temperature of each package and cylinder pressure in every crank angle is calculated. Idea of replacing nature of fuel with that of the mixture constituted by C16H34 and C11H10 in the calculation is put forward in this model. Model, in which influence caused by obligatory convection and strong Stifen flow over the droplet surface in high temperature environment on heat and mass transference is considered, based sphere symmetry physical model with Stifen flow, is adopted.In vaporization calculation, the influence made by boiling point of fuel oil and criticality point is considered.Using this model, based on the combustion calculation, the exhaust pollution in diesel engine is calculated, and their inborndisciplinarian is appeared.Due to the spray mixture model and the vaporization model is used, we can calculate out the influence made by many parameters in the exhaust pollution in diesel engine.In this thesis, some parameters of diesel engine were changed. And we calculate out the exhaust pollution in vary conditions. The organized conclusion was obtained.These conclusions will be useful when the engine adjusted.