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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Emission Characteristics of OH and C_2 Radicals under Engine Knocking
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Emission Characteristics of OH and C_2 Radicals under Engine Knocking

机译：发动机爆震下OH和C_2自由基的发射特性

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摘要

Emission from the area of autoignition in an actual S. I. engine is observed under knocking operation using optical fibers. The difference in emission intensity observed between knocking and nonknocking operation is mainly due to the emission intensities of the OH and C_2 radicals. The emission intensity from these two species increases sharply when autoignition occurs. In addition, emission intensity from the C_2 radical shows two peaks in some cycles. Since the first peak is due to the autoignition reaction, the second peak is thought to be caused by soot formation in some cycles under knocking operation. This second peak corresponded to shadowlike matter seen in high-speed shadowgraphs taken during the expansion stroke.
机译：在使用光纤的爆震操作下，观察到实际的S.I.发动机中自燃区域的排放。爆震和非爆震操作之间观察到的发射强度差异主要是由于OH和C_2自由基的发射强度所致。当发生自燃时，这两种物质的发射强度急剧增加。另外，C_2自由基的发射强度在某些循环中显示两个峰。由于第一个峰是由于自燃反应引起的，因此第二个峰被认为是在爆震操作下的某些循环中由烟灰形成引起的。第二个峰值对应于在膨胀冲程期间拍摄的高速阴影图中看到的类似阴影的物质。

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