Abstract
The local heat flows through the walls of components which form the boundary of the combustion chamber of internal combustion engines operating at high engine ratings exceed those found in most engineering equipment. Despite this the coolant-side face is normally in the ‘as cast’ condition, sometimes with core sand adhering to or embedded in the surface and a rust film, which is almost always present in the case of ferrous components. It is also common for additives such as glycol, soluble oils and/or corrosion inhibitors to be added to the coolant. This paper describes the techniques employed in, and gives the results of, an extensive series of tests into the effect of such surfaces and additives on heat transfer and then goes on to describe the use of the resulting data to predict the operating temperatures of diesel engine components in service. The paper also describes the design techniques that have been evolved to permit satisfactory engine operation under highly rated conditions.
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