局所火炎発光(OH^, CH^, C^*_2)測定によるS.I.エンジン内の火炎特性に関する研究 : 熱工学 , 内燃機関 , 動力など

概要

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The local chemiluminescence emissions intensities of OH^*, CH^* and C_2^* were measured to study local flame front characteristics such as flame propagation speed, flame thickness and local A/F (air/ fuel) ratio. An engine of 548 cc (four stroke, port-injection) was used for measurements at 1 200 rpm for various A/F ratio. The results show that the measured flame propagation speed for both lean and rich was faster than that at a stoichiometric condition, while the speed was almost constant at 3.6 m/s for A/F ratio of 14 to 18. Although the flame thickness both in lean and rich condition was small about 2 mm, the maximum flame thickness was measured at A/F=16 which is over 8 mm. The chemiluminescence intensity ratios of CH^*/OH^* and C_2^*/OH^* were examined to show the A/F under different conditions in comparison with the A/F value measured by O_2 sensor. It was found that the local A/F ratio at the flame front can be estimated by the chemiluminescence intensity ratios of CH^*/OH^* and C_2^*/OH^*.
一般社団法人日本機械学会の論文
2001-02-25