【作者】

Juergen Schiffer,Herbert Krampl,Istvan Godor

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 The development in almost every industry is currently being steered by environment, cli-mate and energy related issues. This is especially true for the automotive industry, wherein the advances in the combustion engines, independent of their operational principle and application, are strongly affected by them. While on the one hand it is mandatory to comply with the laws governing emission and environmental concerns, the modifications brought about should also cater to the demands of the customer in terms of higher efficiency and reliability. The current work, carried out in cooperation with GE Jenbacher GmbH & Co OG, deals with large-volume stationary gas engines used for power generation. Here, an at-tempt has been made to assess the tribological system comprising of piston ring and cylinder liner, which bears the highest loss in a combustion engine in terms of energy. The aim here is to optimize mechanical, thermal and tribological load bearing capacity of the system. The study also focuses on reducing the probability of spontaneous failure of this system to affect in a greater reliability. This in turn would ensure continuous power generation and safeguard the costs and resources. While modern engine test benches are more than capable of testing the aforementioned system of interest here, they are time consuming and highly cost intensive. Also, post-test damage analysis in such bench tests does not offer much of an insight into the happenings that had occurred during the test. Therefore, a model scale, damage-equivalent test methodology, was designed here for a comprehensive as-assessment of the system in a quite economical and time efficient manner. The tests were carried out on a TE 77 test rig from Phoenix Tribology with an analogous' Ring-on-Liner' configuration. The specimens were cut out from real components. To verify conformity between the two specimens, a light-gap-method is applied. The component-based test configuration facilitates damage-equivalent investigation of the piston ring-cylinder liner system. Post-test characterization was also carried out to elucidate and substantiate the findings from the tribological tests. The results obtained for a generic tribosystem consisting of a low alloyed and tempered spheroidal cast iron piston ring with a chrome ceramic layer, and an untreated lamellar cast iron (EN-GJL-250) cylinder liner, were considered as a reference. Numerous base materials with varying surface treatments have been investigated through a series of experiments to find an optimized solution which would offer an increased tribological loading capacity, with improved efficiency and reliability. The corresponding results facilitated in identifying an optimized system w.r.t base material, thermal treatment, topography, and lubricant. Finally, the results would be validated on a test engine in order to verify whether the chosen system would be suitable for a real life engine.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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