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Emission reduction and efficiency increase of two-stroke marine diesel engine depends on fuel injection, which affects in-cylinder combustion. This paper presents injection strategies varied results from simulation based on AVL BOOST and the experimental results and its validity was confirmed by actual measurements in a two-stroke engine during shop testing, which reveals the affect on performance and emission, as well as the corresponding concept analysis. This simulation enabled a more thorough investigation into engine performance features. In particular it provided a detailed examination of how changes in injection strategies impacted the combustion and ultimately engine performance. These results are summarized and based on these results, optimal injection strategies settings are suggested for balancing engine performance and NOx emissions.

Automotive exhaust-based thermoelectric generator (TEG), which effectively converts exhaust thermal energy into electrical energy, can gradually improve the utilization efficiency of energy. The heat exchanger of TEG is one of the most important components for heat transfer, so as to realize energy saving and emission reduction. Hence, its configuration and thermal performance should be intensively studied. In this paper, a new configuration of heat exchanger, whose heat transfer area is regular octagon, is designed in comparison with the pervious rectangle one. In order to improve average temperature and thermal distribution uniformity, typical CFD software named FLUENT is used to simulate the multi-coupling of temperature - fluid - solid, and the temperature distribution on heat transfer area is gained. Moreover, the temperature distribution will be analyzed to evaluate the merits and weaknesses of configuration and thermal performance.