Research Note: A Method for Assessing the Maximum Temperature of Exhaust Valves in Internal Combustion Engines

Abstract

The concept of mean cycle temperature has been used, by Seale and TayIor (1) §, to calculate heat transfer in pistons and liners of internal combustion engines. However, this technique cannot be used for exhaust valves because the valve temperature exceeds the gas mean cycle temperature. In this work it is shown that a 'mean temperature', based solely upon radiation considerations, yields a simple method for assessing the maximum temperature of exhaust valves and that the results obtained from engine tests are in close agreement with those predicted. The engine used in the investigation was a Mirrlees Blackstone K Major four-stroke diesel engine of 380 mm bore, operating with a b.m.e.p. of 1660 kN/m2 at 600 rev/min. engines', Proc. Instn mech Engrs 1970-71 185 (Part l), ANNAND, W. J. D. and MA, T. H. 'Instantaneous heat transfer rates to the cylinder head surface of a small compressionignition engine', Proc. Instn mech. Engrs 1970-71 185 (Part

Investigations on the heat transfer within intake and exhaust valves at various engine speeds

“…In the recent years, several studies were focused on the exhaust valves mainly in the determination of the temperature map. In his technical note, Tomlinson et al [14] developed a method to evaluate the maximum value of exhaust valve temperatures, based upon the concept of fourth-root temperature. [16] investigated numerically the effect of different carbon film thickness on the exhaust valve where the stress distributions and temperature profiles on exhaust valve are obtained depending on different carbon film thickness and operation conditions.…”

Effect Of The Engine Speed And Loading On The Heat Transfer Within Exhaust Valves

“…This correlation, of course, ignored the engine load, fluid cooling, sparks timing effects and tiled some real conditions surrounding the valve but it drew an experimental way to assess the valve temperature. Todinson et al [8] presented a method basing on the average gas temperature during the engine cycle for assessing the maximum temperature of exhaust valves in internal combustion engines. Shojaefard et al [9] developed a methodology for transient thermal analysis of the exhaust.…”