Spray oil cooling for large bore pistons - InKoMar

Project start
01/08/2019
Project end
31/12/2022
Category
Forschung
Spray oil cooling on the large flask

The joint project “InKoMar – Innovative cost- and emission-optimized lightweight piston development for the gas operation of large maritime dual-fuel engines” consisting of WTZ Roßlau gGmbH, MET Motoren- und Energietechnik GmbH and Seco GmbH has the project objective of developing a new design concept for future large engine pistons in the gas operation of dual-fuel engines in the maritime sector. The complicated and costly lubricating and cooling oil supply via the crankshaft and connecting rods is to be replaced by a simple spray oil supply via a nozzle, which will significantly reduce the manufacturing costs. In addition, the weight of the crankshaft and connecting rod can be reduced, which reduces the moving masses and thus increases the efficiency of the engine. Until now, this simple spray nozzle oil feed has not been available for large engine pistons. The new spray oil feed is to be combined with a friction-welded connection between the upper and lower piston sections, the combustion chamber shape of the piston is to be adapted to dual-fuel gas operation, and the entire assembly is to be of extremely lightweight design.

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To this end, a 1-cylinder research engine is being equipped with the new spray oil cooling system at the WTZ and its suitability is being evaluated in experimental tests. The investigations are based on a measuring system developed specifically for this project. measuring system for the continuous recording of a 3D temperature and strain measurement field on the moving piston. In addition, the operational suitability and manufacturing quality of the test piston with splash oil cooling will be verified experimentally.

The findings obtained in the subproject of the WTZ Roßlaus form the eminently important basis for the technical and economic evaluation of the novel piston cooling system carried out together with the project partners. The solution approach of a new spray oil feed is to meet the requirements of future generations of marine engines, as well as the current and future IMO TIER III/IV regulations for emission reduction.

The project is funded by the German Federal Ministry of Economics and Climate Protection.