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Appendix J: High Performance ICE Engines Roadmap
Pages 182-186

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From page 182...
... This compares with an actual best-point brake thermal efficiency status of roughly 42 percent for their comparably sized engine available in 2007.1 It would be worthwhile to consider which of the following SuperTruck improvements might be applicable to the ICEs used today in the Army's ground combat vehicles, tactical vehicles, and mobile/stationary power plants: • Improved high heat release rate combustion • Variable valve timing/displacement-on-demand 1 Misc. Authors, 2020, U.S.
From page 183...
... For example, the Cummins waste heat recovery system is one of the most extensive, collecting heat from charge air, the EGR cooler, engine coolant, and the exhaust system. Given that military engines do not run exhaust gas recirculation (EGR)
From page 184...
... To achieve those targets, it is recommended that the following actions be considered: • Higher fidelity combustion computational fluid dynamics modeling -- for improved indicated specific fuel consumption. • Improvements in conjugate heat transfer models -- to ensure even temperature distribution along the bore with minimum hot bore distortion; also for piston temperature predictions; needed to achieve increased power density.
From page 185...
... piston rods for reduced reciprocating mass • Improvements in thermal barrier coatings (on MMC piston crowns) to minimize heat transfer; this requires a combination of low thermal conductivity and low specific heat • Improvements in piston undercrown cooling to better manage temperatures within safe material limits • Much higher power e-Turbos for improved air handling plus abil ity to recover energy from the exhaust • Potential use of artificial intelligence/machine learning models to optimize the MMC properties used in the piston and conrods • Additional work on friction .
From page 186...
... Examples include studies of injector spray angle, number of holes, hole sizing, and piston crown shape. As a first step, it is suggested that these faulty CFD studies be closely examined to determine the "root cause" for their failure.


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