Application Of Alcohol Substitute Fuel In Partially Insulated Diesel Engine

The diesel engine industry is facing huge challenges brought about by "carbon peak","carbon neutral" policies and emission regulations.Reducing the consumption of fossil fuels is of great significance to chinese economic security,strategic security and ecological security.Nowadays,the diesel engine industry is facing more and more pressure for change.When it is difficult to solve more problems with a single method,the combined use of multiple methods has become inevitable.In reducing fossil fuels and carbon dioxide emissions,there are mainly two types of technical means: one is to use low-carbon alternative fuels;the other is to improve the thermal efficiency of diesel engines.Long-chain alcohols represented by butanol have always been one of the most potential diesel substitutes,and the technology of using TBCs(thermal barrier coatings)for combustion chambers to improve thermal efficiency has been studied since the 1980 s.This paper took the WP4 diesel engine with partially insulated combustion chamber as the research object,and compared the performance improvement by TBCs on the top of the piston when pure diesel and B30 fuel were used.The advantages of alcohol alternative fuels compared with diesel;then different long-chain alcohol/diesel blended fuels were used in partially insulated diesel engines,and the influence of properties of alcohol alternative fuels to the improvement by TBCs on the tops of pistons of the performance of engines.It has certain guiding significance for the development of high-performance engines using alternative fuels in the future.The main contents of this paper are as follows: Referring to the existing data and the results of pretest experimences,based on the characteristics and the requirements of the diesel engine used in this experiment,the TBCs of the combustion chamber was selected and the spray thickness and thickness of the TBCs were determined.At the same time,the fuel required for the test was prepared and the parameters of the fuel were calculated and measured.Thirdly,the effects of the TBCs on the top of the piston on the engine performance when using diesel fuel and B30 fuel were compared through experiments,forcing on the characteristics of B30 fuel in coupling with TBCs technology compared with pure diesel.Finally,the effects of the TBCs on the top of the piston on the engine performance when the engines were fueled with P30,B30,A30 and H30 were compared through experiments,so that the effects caused by the different combustion modes of pure diesel and alcohol/diesel blended fuel were excluded.The effect of the properties of alcohols on the effect of thermal barrier coatings was investigated.This study showed that,compared with pure diesel,B30 fuel enhanced the ability of thermal barrier coating on the top of the piston to improve the thermal efficiency of the engine under high working conditions,and alleviated the trend that the TBCs’ effects decreased sharply with the increase of rotation speed.But at the same time the deterioration effect of TBCs on NOx emission is improved.The comparison between engines using different alcohol/diesel blended fuels showed that the shorter the carbon chain length of the alcohol,the stronger the ability of the TBCs to improve the engine power performance under high working conditions.On the reduction of HC emissions and NOx emissions,the TBCs has the best effect on engines using B30 fuel.