蛍光体を用いたエンジン筒内ガス温度速度同時計測

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A combined velocity and temperature measurement method using a high speed camera, a single-pulsed UV laser and temperature sensitive phosphor particles had been proposed. The method was extended to a measurement of a gaseous flow at high temperature. The phosphor particles are the powders of rare earth-doped ceramics, which have strong sensitivity to temperature, resulting in a small intensity and a short lifetime of luminescence at high temperature. The phosphor material was painted on the solid wall in an engine cylinder, and the instantaneous wall temperature was measured, in order to confirm the applicability of phosphor particles to the in-cylinder measurement. The measured wall temperature increased with the increase of measured pressure in the cylinder. The measured wall temperature distribution and its temperature had good correlation with a change of calculated gas temperature from the pressure. Then, the combined temperature and velocity measurement of the gas flow in the cylinder was performed. The temperature was calculated from the lifetime and the velocity was obtained from the phosphor particle images during a single decay. Two dimensional velocity and temperature distribution in the engine cylinder was successfully visualized. The temperature changes dependently on the crank angle agreed qualitatively with the gas temperature estimated from the pressure. However, the absolute values of the measured temperature had differences from the estimated ones.

蛍光体を用いたエンジン筒内ガス温度速度同時計測

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