模擬空気を作動気体とした20kW安定形アーク加熱器の製作

概要

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A 20 kW arc-heater with a mixture of nitrogen and oxygen as the working gas has been designed and manufactured. Conventional arc-heaters operating with air are often characterized by discharge instability and short lifetime at high power due to the violent oxidization of electrodes. The improved injection of working gases and the special configuration of the discharge chamber and the electrode cooling passages enable us to operate the arc-heater stably for a long time. This newly-devised arc-heater was tested to obtain its discharge properties. The continuous operation was terminated voluntarity in 30 minutes, and showed no discharge instability and little electrode erosion. The used electrodes were reusable after just surface cleaning. The characteristics of discharge current and discharge voltage were obtained with gas flow rate and mixture ratio as parameters. The maximum power over 30 kW could be brought to the arc-heater without damage to the device. The mixture ratio of oxygen could be increased up to 40%, providing stable discharge.
社団法人日本機械学会の論文
1993-02-25