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Effect of Copper Coating on Extended Expansion SI Engine

Author(s): V. Krishnamoorthy | S. Chandrasekaran

Journal: Journal of Applied Sciences
ISSN 1812-5654

Volume: 7;
Issue: 12;
Start page: 1633;
Date: 2007;
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Keywords: lean misfire limit | efficiency | ER/CR | SFC | Extended Expansion (EE) | Variable Compression Ratio (VCR)

In this research, a single cylinder engine with variable ER/CR ratio was analyzed for its performance when copper coating is done on the surface of cylinder head - piston combination. Copper element which can promote pre-flame reaction was coated on the surface of cylinder head and piston. ER/CR ratio (Expansion ratio/compression ratio) was varied with LIVCT (Late Inlet Valve Closing Time) and the load was regulated with LIVCT-VCR combination. Due to the catalytic effect of copper coating it was found that for the copper coated EE engine, the brake thermal efficiency was improved by 4% compared to standard engine operating at same conditions. The SFC of the copper coated engine was reduced by 0.8 kg per kw-h compared to that of standard engine. It was found that for ER/CR ratio equal to 1.5, the copper coated EE engine was giving best performance in terms of load and thermal efficiency. It was also seen that the lean misfire limit of the engine was extended up to 0.75.
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