超希薄燃焼における火炎速度と燃焼室壁面二次元温度分布測定法の研究

抄録

Ultralean combustion (air-fuel ratio is more than 20) is known to be effective in point of combustion improvements such as clean exhaust gas and high thermal efficiency. Yet, there are unsolved problems such as combustion instability. Swirl is an effective method of stabilizing lean combustions, and it is important from a combustion stability standpoint to understand the relationship between swirl and wall temperature or between swirl and flame. This paper presents measurement methods of two-dimensional visualization on hemisphere chamber wall temperature and three-dimension like flame speed in spark-ignition engine ultralean combustion by means of an image intensifier.