Simulation studies of the effects of low-heat-rejection on turbocompound diesel engine performance
by D.N. Assanis, J.B. Heywood
International Journal of Vehicle Design (IJVD), Vol. 8, No. 3, 1987

Abstract: A computer simulation of a turbocharged turbo compound diesel engine has been developed to study the effects of low-heat-rejection on system performance. It is shown that high combustion chamber wall surface temperatures cause a significant drop in volumetric efficiency. As a result, even a fully-insulated engine achieves a modest thermal efficiency improvement (less than 5 per cent) over a base line cooled engine. The efficiency benefit can be somewhat increased if a comprehensive optimisation of key system variables such as injection timing, compound turbine gear ratio, strategy of insulation, and turbomachinery performance is carried out for a given low-heat-rejection configuration. Substantial thermal efficiency gains (up to 15 percent) can be achieved if the system approaches a truly adiabatic condition. This requires that the wall surface temperatures follow the variation in gas temperatures. For practical ceramic materials, cyclic surface temperature variations up to 250 K are expected. However, the resulting improvement in thermal efficiency is associated with a marked increase in component thermal loading.

Online publication date: Sun, 25-May-2014

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