Abstract
A lumped parameter model is developed to study performance of marine diesel engine thermal management system. One dimensional flow equations combined with classical Webie combustion model and Woschni heat transfer model are employed to describe diesel's flow characteristic. Modeling results of heat release from diesel engine is validated against experimental data. Cooperated with experimental data based models of water pump and heat exchangers, thermal management system performance is analyzed while engine fresh cooling water outlet temperature is controlled to achieve a certain value by a PID temperature regulating valve. The results shown that inlet seawater temperature variation has relatively little effect on opening of regulating valve, but engine power output variation results in notably regulating valve opening fluctuation. Modeling results would be employed in an advanced submarine diesel engine system design.
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