火花点火发动机火花塞附近紊流运动规律的研究

Study on the Characteristics of Turbulent Flow near the Spark Plug of a SI Engine

在一台倒托的试验发动机上，利用热线风速仪测定了缸内火花塞附近的气流运动情况，分析了发动机转速和节气门开度对该处紊流特性参数的影响。结果表明：火花塞附近气流的平均速度、紊流强度与发动机转速成正比；在压缩上止点附近，紊流尺度与转速有关；节气门开度对压缩上止点前后的紊流特性参数影响很小。

Air motion near spark plug in cylinder of a motored research SI engine is measured by using hot wire anemometer. The influence of engine speed and load on turbulence characteristies is analyzed. The experimental result, show that the mean velocity and turbulent intensity near the spark plug is a linear function of engine speed, the turbulent scale near TDC of compression stroke is related to engine speed and it is not influenced by the opening of throttle.