Efficiency analysis of a four-stroke marine engine

Abstract

Conventional propulsion systems consisting of the main propulsion machine, transmission (axle line) and propeller fail to always meet all the conditions of flexibility, manoeuvrability and space requirements imposed on a modern naval propulsion system. The imposition of new, strict rules in shipbuilding and navigation has led to the emergence of new naval equipment, new propulsion systems that have changed the ship's arrangements for economic and efficiency reasons. The useful volume compared to the total volume of the ship is a good economic indicator that allows the analysis of the income and expenses of construction and operation of the ship. For example, following the analysis of the use of space on board passenger ships built in the last 50 years, the ratio between the volume intended for the propulsion installation and the total volume of the ship varies around an average of 11.3%, (between 8% and 17.5%, exceptionally reaching 22%).