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Naturally Aspirated Low Heat Rejection Single Cylinder Extended Expansion (Miller Cycle) C.I. Engine
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Abstract
This paper discusses the experimental investigation of extended expansion and thermal insulation on the performance of a diesel engine. A single cylinder naturally aspirated air-cooled diesel engine is modified to run on the concept of extended expansion (Miller cycle). In the modified engine, the expansion ratio is maintained greater than the effective compression ratio by modulating the intake valve closing time and the clearance volume. The cylinder head, valve, and the piston top are coated with partially stabilized zirconia (PSZ) for low heat rejection. Results show a significant improvement in fuel efficiency of the insulated extended expansion engine. A ratio of expansion ratio to effective compression ratio of 1.5 is found to be optimum.
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Nazar, J., Gopalakrishnan, K., and Mavinahally, N., "Naturally Aspirated Low Heat Rejection Single Cylinder Extended Expansion (Miller Cycle) C.I. Engine," SAE Technical Paper 970202, 1997, https://doi.org/10.4271/970202.Also In
References
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- Nagesh M.S. “Experimental Investigation on Extended Expansion Concept as Applied to a Four-Stroke S.I. Engine” Indian Institute of Technology Madras July 1991
- Cummins Lyle Internal Fire SAE Publication 1989
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- Kamo Roy Bryzik Walter “Uncooled, Unlubricated Diesel” Automotive Engineering 87 6 June 1979