Fig 8 Temperature Results at 2000 RPM Showing Effect of LHR Operation

The IRIS model predicted an average fire-deck temperature of approximately 1200°F, an exhaust valve temperature of approximately 1350°F, piston bowl temperature of 900°F, and a top ring reversal temperature greater than 650°F for the 2000 rpm full load condition.

Combustion Analysis - The poor LHR engine performance was attributed to degraded combustion. Fig. 9 is a plot of apparent heat release rate versus crank angle comparing the baseline metal engine with the hot ceramic engine at 2000 rpm, full load. Combustion in the LHR engine was characterized by less premixed burning, lower heat release rates, and longer combustion duration compared to the baseline metal engine. The + and X symbols in Fig. 9 designate the heat release rate centroids for the baseline metal and hot ceramic engines, respectively. The centroid for the hot ceramic engine was shifted to the right due to reduced premixed burning and longer combustion duration.

The fuel injection pressure versus crank angle curves corresponding to the o> o

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