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Title
Japanese:エンジン筒内における火花放電プラズマの温度計測 
English:Measurement of temperature of spark-discharge plasma in engine cylinder 
Author
Japanese: 木下雅夫, 冬頭孝之, 政所良行, 杉浦明光, 赤塚洋.  
English: Masao KINOSHITA, Takayuki FUYUTO, Yoshiyuki MANDOKORO, Akimitsu SUGIURA, HiroshiAKATSUKA.  
Language Japanese 
Journal/Book name
Japanese:日本機械学会論文集 
English:Transactions of the JSME 
Volume, Number, Page Vol. 86    No. 883   
Published date Mar. 4, 2020 
Publisher
Japanese:日本機械学会 
English:Japan Society of Mechanical Engineers 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.jstage.jst.go.jp/article/transjsme/advpub/0/advpub_19-00319/_article/-char/ja
 
DOI https://doi.org/10.1299/transjsme.19-00319
Abstract The vibrational and rotational temperatures in a spark-discharge plasma were measured using optical emission spectroscopy in the cylinder of an engine operating at 1000 rpm. Based on the observed spectrum, the nitrogen molecule emissions from 370 to 385 nm were measured in an air atmosphere without fuel injection. The plasma temperatures were estimated by fitting a theoretically calculated spectrum. When the spark discharge timing was retarded, an unknown band head (different from that corresponding to nitrogen molecule emissions) appeared. This made temperature estimation difficult. Two experiments were performed in an attempt to examine the origin of the unknown band head. One involved using a pure nitrogen atmosphere, instead of air, in the cylinder. However, due to the appearance of a strong nitrogen ion band head, part of the nitrogen molecule spectrum could not be identified. The second experiment addressed the emissions from the spark plug electrodes. The band head was presumed to be a result of emissions from Fe, Ir, Rh, and Cr. The experiment was performed using a spark-plug with electrodes with reduced amounts of these elements. The band head for temperature measurement was hidden by unknown band heads. As a result, estimation of the temperatures in the plasma was not possible later than the discharge timing of 60 ° BTDC. At a discharge timing of 60 ° BTDC (ambient pressure = 0.25 MPa, ambient temperature = 390 K, flow rate = 20 m/s), the vibrational temperature in the spark-discharge plasma was 9200 K while the rotational temperature was 2300 K.

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