The Calculation of the Thermal and Stress-Strain State for the Monoblock of a High-Speed Marine Diesel Engine

This article examines a high-speed marine diesel engine 42ChN16/17 that provides 2940 kW of power at the crankshaft rotational frequency of 2 200 min–1. The diesel engine features a monoblock case made of the AL4 aluminium alloy, with thin-walled cylinder liners whose considerable out-of-roundness leads to an increase in lubricant consumption and a reduction in engine life. A study aimed at decreasing the thermal stress state of the monoblock-cylinder unit is conducted as well as a search for alternative design solutions to support this. A numerical analysis based on the finite element method is performed to study fields of temperatures, displacements, deformations and stresses of the engine case parts. Ways to decrease, first and foremost, deformations of the parts are outlined.

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