Abstract
The heat transfer coefficient on an engine cylinder wall from burnt gas is important information for studies on phenomena of the heat transfer in engine cylinder. It is necessary to obtain the gas temperature near the cylinder wall for calculating the heat transfer coefficient. In this study, the burnt gas thermometer by infrared rays (IR thermometer) is constructed, calibrated and applied to the engine cylinder gas temperature measurements. The calibration experiments of the IR thermometer are carried out using the constant volume vessel as the same gas conditions in the engine cylinder at 30, 47 and 59 degrees of ATDC. The calibration equation between output of IR thermometer and burnt gas temperature is calculated by interpolation from the data of calibration experiments, with consideration of composition and density of the burnt gas in the measuring volume. As the results of experiments using a spark ignition engine, the temperature distribution near the engine cylinder wall measured by the IR thermometer is almost uniform, and the difference from average temperature of burnt gas calculated by the first law of thermodynamics is from 100K to 150K. The reason is thought that the gas flow in the engine cylinder is turbulent flow and the gas is approximately uniform temperature by stirring.
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