The Evaluation of Performance and Increasing Leak Tightness of Gas Joints in Boosted Medium-Speed Diesel Engines

The tendency in the development of modern medium-speed diesel engines is to make them more powerful, efficient and environmentally friendly, as well as to extend their service life. The ever-increasing maximum pressure of the working cycle in such engines currently stands at 20–25 MPa, thus leak tightness of gas joints is of great importance. He authors describe methods of assessing leak tightness of a gas joint in a medium-speed engine under boosting with regards to the maximum pressure of the cycle and the mean effective pressure. The results of calculations of thermal and stress-strain conditions of the parts that form a gas joint in an advanced medium-speed diesel engine of the ChN26.5/31 type are presented. This type is used as a locomotive, marine and stationary engine including a reserve engine for atomic power stations.

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