Application of thermal isolation to the combustion chamber of a single cylinder diesel engine and its effects on performance and emission

Abstract

In this study, the effects of boron based thermal barrier coating (Fe₂B and NiCrBSi) on the performance and emission of a single cylinder diesel engine were investigated.  In the coating process of the engine parts, two difference methods were used. Cylinder liner and valves were coated with solid boronizing and the top surface of the piston is coated with plasma spray method. Boron layer (Fe₂B) and NiCrBSi have low thermal conductivity and high thermal resistance. So that, the combustion chamber of diesel engine was converted in to insulated form. Tests were carried out under 5 speeds (1800-2100-2400-2700-3000 rpm) of diesel engine. commercial D-2 was used as test fuel. Coated (CE) and standart engine (SE) test results were compared. Comprehensive analyzes have shown that brake specific fuel consumption (BSFC) was reduced by 11 %, in the CE. On the other hand, CO and HC emissions of the CE decreased by 33-17 %, repectively. And NOx emission increased by 14 % .

Keywords

• Boronizing,thermal barrier,engine,performance

References

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