【作者】

Per Ronnedal，Hirofumi Yamamoto，Takayuki Goto

【摘要】

论文已在中国上海举行的2013年CIMAC大会上发表，论文的版权归CIMAC所有。The two stroke crosshead low speed diesel engine has been a preferred prime mover in the merchant marine for mostly a century. Although its basic working principle has not been changed, the demand for still higher power, produced at the lowest possible fuel consumption, from a machine occupying a minimum of space, has constantly increased the demands to its cylinder liner. This relates to both the thermal and mechanical loading, and the tribological behaviour under ever changing conditions. This pa-per gives a view on the development in loading on the cylinder liner as one of the main engine components as it has developed over time. Special attention is given to the recent development as a result of the high focus on specific fuel oil consumption, and the thereby introduced changes in the combustion conditions. New application of advanced analysis method for acid attack on the running surface of the cylinder liner is demonstrating how the new operating conditions will affect the behaviour of the cylinder conditions, and in consequence the cylinder liner. Countermeasures in way of design and operational measures will be presented and service examples will illustrate the validity of the conclusions and countermeasures. As for the increased mechanical loading of the cylinder liners, two main new designs will be demonstrated:1) One new design relates to the mechanical design of the cylinder liner, and how this design is able to withstand the increased pressure from the diesel process. The cylinder liner consists of a so called ' strong back' consisting of a steel bandage shrink fitted to the upperpart of the cylinder liner. The increased strength of the steel in comparison with the cast iron material thus results in a higher load capability. Service experience of several years of operation is presented for reliability confirmation.2) The other design feature allowing the increased pressure is based on development of a new material application: the so called CGI or Compacted Graphite lron. This application has been developed in tight cooperation with the Japanese cylinder liner manufacturer Toa Koki. The paper describes the production technique applied to achieve a high a stable yield. The merit in terms of mechanical properties of the CGI is shown. Tribological test data will be presented, and finally service experience will be shown for a number of different engines. In summary it will be illustrated how modern diesel engine process and application affects the cylinder liner, and how these effects are overcome.

【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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