Air consumption data and practical performance of the stork uniflow-scavenged two-stroke marine engine 1

Abstract

With conventional non-pressure charged four-stroke engines and with two-stroke engines having a directly coupled scavenge pump the quantity of air delivered to the engine does not change with variation in load of the engine at the same engine speed.

In contrast to these engine types the large Stork marine engine is pressure charged by the turboblowers only. There is therefore no direct relation between the speed of the engine and the quantity of air consumed by the engine for combustion and scavenging. In Part I a number of engine characteristics, resulting from this fact is discussed.

In Part II some data on the practical experience with the Stork engine over a decade of operation are presented. These data include cylinder liner wear and consumption of piston rings, behaviour of exhaust valves, cylinder corvers, pistons, bearings, fuel atomizers and turboblowers.

Various aspects of maintenance are discussed as well as the measures taken to extend the period between overhauls of a number of essential engine parts.