Improvement of Heat Flux Measurement on Combustion Chamber of Spark Ignition Engine (Conditions on Combination of Composite Materials in Thin Film Type of Heat Flux Sensor)

• Published in: Nihon Kikai Gakkai rombunshuu. B hen Vol. 19; no. 8; pp. 1753 - 1758
• Main Authors: Nagase, Yoshinori, Tasaka, Hidenori
• Format: Journal Article
• Language: Japanese
• Published: 01.08.2007
• ISSN: 0387-5016

It is important to measure heat flux from the burnt gas to the combustion chamber because of the improvement of the efficiency of an engine. Instantaneous heat flux of S. I. Engine is usually measured using a thin film type of heat flux sensor. But there is a significant difference of outputs among heat flux sensors on the market. In this study, some types of heat flux sensors are produced and evaluated by experiments using a constant volume vessel. To confirm the accuracy of each type of sensor, the wall side heat flux which is average of heat fluxes from same type of heat flux, sensors installed in the vessel, is compared with the gas side heat flux which is calculated from the change of pressure in the combustion vessel. The results show that the wall side heat fluxes obtained by sensors which produced obeying the law of thermocouple are agree with the gas side heat flux. It is found that the plating film should be the same metal to the wire of sensor. Furthermore, measuring for the transient component of the heat flux, it is not necessarily for the body of a heat flux sensor to use the same material of the combustion wall.