感熱燐光体を用いたディーゼル機関燃焼室壁面温度の画像計測(熱工学,内燃機関,動力など)

概要

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In order to investigate the mechanism of heat transfer on the chamber wall of D. I. diesel engines, 2-D temperature imaging and heat flux measurement in the flame impinging region on the chamber wall were conducted using the laser-induced phosphorescence techniques. The temperature of the chamber wall surface was measured by the calibrated intensity variation of the 355 nm-excited laserinduced phosphorescence from an electrophoretically deposited thin layer La_2O_2S : Eu phosphor on a quartz glass plate placed in a rapid compression machine. Instantaneous 2-D images of wall temperature at different timings after start of injection and time-resolved (10 kHz) heat flux near the flame impinging region were obtained for combusting and non-combusting diesel sprays with an impinging distance of 23.4mm at different injection pressures (80 and 120 MPa). The measured temperature images of the chamber wall for the combusting spray exhibited finely structured temperature distribution, while a smoother temperature distribution was observed for the non-combusting spray. The temperature increase due to spray and flame impingement is observed both for combusting and non-combusting sprays, but observed in a much larger area extending downstream for the combusting spray. The increase of injection pressure advanced and enhanced the heat transfer due to spray impingement.
社団法人日本機械学会の論文
2008-02-25