Date of Publication:2016-01-01

Journal:哈尔滨工程大学学报

Affiliation of Author(s):能源与动力学院

Issue:5

Page Number:690-695

ISSN No.:1006-7043

Abstract:The uncombusted film of fuel on the piston chamber walls of an internal combustion engine is a primaty source of pollutant discharge. In order to solve this problem, an equation for predicting the evaporation rate of the wall film was proposed. In addition, a one?dimensional unstable?state mathematical model was established to evalu?ate the heating and evaporation characteristics of the wall film. The conduction between the film and the wall, the convection between the film and the ambient air as well as the quantity of heat transferred by heat convection and e?vaporation of the wall film were considered in this new method. The transient behavior of an n?dodecane fuel at high ambient temperature and pressure was predicted by the new model, which provides an analytical solution for the temperature distribution within the fuel film. The results show that the process of wall?film heating and evaporation can be divided into three distinct stages, including an initial rapid heating stage, a stable heating and evaporation stage, and a final stage. The investigations show that the evaporation rate is higher for conditions of a thinner initial wall?film thickness, higher ambient temperature and convection rate, and lower ambient pressure.

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