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Exhaust valve failure under residual fuel operation

Lookup NU author(s): Sangram Nanda, Professor Tony Roskilly

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Abstract

The Last Two Decades Have Seen marine diesel engine power ratings Increase Significantly, with a simultaneous deterioration of fuel oil quality. This has resulted in higher thermal loads and a more corrosive environment for an exhaust valve which is a key component of the combustion chamber. This HAS resulted in higher thermal loads and a more corrosive environment for exhaust valve year Which is a key component of the combustion chamber. For engines operating on heavy oil the most common form of valve failure is through the formation of a blowby channel on the valve face. For engines operating on heavy oil The Most common form of valve failure IS Through the formation of a blowby channel on the valve face. In this paper an effort has been made to clarify the mechanism of this type of failure by discussing the effect on operating parameters related to such failure. In this paper year effort has-been made to Clarify the Mechanism of this type of failure by discussing the effect on operating parameters related to Such failure. A number of failure modes have been established that are responsible for such failure. A number of failure modes ESTABLISHED Have Been That Are Responsible for Such failure. However, rarely does a failure take place under single mode of failure, it is most commonly a multiple mode of failure. However, rarely take place Does a failure Under single mode of failure, it IS MOST Commonly a multiple mode of failure. It has been clarified how the formation of a dent, depending on its dimensions, can lead to formation of a gas channel that increases in size over a period of time. It has-been Clarified how the formation of a tooth, DEPENDING ON ITS dimensions, can lead to formation of a gas channel That Increase in size over a Period of time. The formation of this gas channel leads to accelerated hot corrosion due to high pressure combustion gases flowing through the channel at high velocity thereby increasing the temperature. The formation of this gas channel leads to accelerated corrosion due to hot combustion gases flowing high pressure-through the channel at high velocity thereby Increasing the temperature. The extent of corrosive attack is dependent on the quality of fuel used and material. The extents of corrosive attack on the IS dependent quality of fuel Used and material.


Publication metadata

Author(s): Roskilly AP; Nanda SK

Publication type: Article

Publication status: Published

Journal: Proceedings of the Institute of Marine Engineering, Science and Technology Part B: Journal of Marine Design and Operations

Year: 2003

Volume: Part B

Pages: 23-29

ISSN (print): 1476-1556

Publisher: Institute of Marine Engineering, Science and Technology


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