Measuring Method of Instantaneous Surface Temperature Intake and Exhaust Valves in DI Diesel Engine

Abstract

The severe conditions under which intake and exhaust valves of D.I. diesel engines must operate (including exposure to hot combustion gas and engagement in a rapid reciprocating motion) present a variety of obstacles to the successful measurement of instantaneous surface temperature which is necessray in evaluation of direct heat loss from the combustion gas to those valves. In this study, the authors have developed new thin film thermocouples of high heat resistance along with a method of leading signal wires out from the valve surfaces to recording apparatus.