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Tests on piston ring – cylinder liner collaboration of high power engine

Serdecki W., Krzymień P., Brzeziński Ł.

Silniki Spalinowe

2009

R. 48, SC1

35--42

Presented paper describes the most important modifications recently introduced to the high power engine piston-cylinder assembly and an analysis of effect of these changes on collaboration between rings and cylinder liner. One of the key issues brought about in the paper is the evaluation of constructional modifications performed on piston-cylinder assembly elements and their effect on oil film quality and friction losses encountered during operation of this assembly. Results of simulation tests on oil film formation on marine engine cylinder liner surface will be used for the analysis.

W pracy opisano najważniejsze zmiany wprowadzone w ostatnich latach w budowie układu tłokowocylindrowego silników dużej mocy oraz przeanalizowano wpływ tych zmian na przebieg współpracy pierścieni z gładzią cylindra. Jednym z ważniejszych zagadnień poruszanych w pracy jest ocena wpływu zmian konstrukcyjnych elementów układu tłokowo-cylindrowego na jakości filmu olejowego tworzonego na gładzi cylindra oraz na straty tarcia towarzyszące pracy tego układu. Wnioski wynikające z dokonanego przeglądu zostaną wykorzystane przy budowie modeli matematycznych dotyczących kształtowania się parametrów filmu olejowego na gładzi cylindrowej silnika dużej mocy.

Determination Of Cranktrain Frictional Resistance Using The Motored Engine Method

Serdecki W., Krzymień P.

Journal of Polish CIMAC

2008

Vol. 3, no 2

9-13

Friction losses generated in engine kinematic nodes have an essential effect on its general efficiency. Measurement of these losses and indication of areas where they are generated can contribute to their minimization at the stage of engine design and during its operation as well. Most of the loss measurement methods requires an intervention in engine construction. The method of engine motoring does not require such intervention and at the same time offers possibility of precise measurement of engine resistance. The results obtained with the use of this method are considered hardly precise (among others because of different conditions during engine normal operation and its motoring), nevertheless they allow to estimate the influence of various effects on resistance observed on an engine. This study presents the results of tests on the effect of certain quantities characteristic for engine operation as well as properties of lube oil applied on the course of instantaneous values of motored engine torque. Another achievement of the study is the recommendation of test conditions securing highest possible accuracy of engine resistance torque determination. The simulation tests were carried out on the 170A.000 engine.