Measurement of Air Flows by Means of Repetitive Spark Method

概要

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The measurement of air flows in internal combustion engines, such as occur in gas-exchanging or in the combustion chamber, is very difficult because of their great unsteadiness and complexity. The present paper treats of the availability and limitations of repetitive spark method in visualization and quantitative determination of such kinds of flows. The following are the results derived from the investigation. Although this method is absolutely accurate for a steady parallel flow, the acceleration produces considerable errors owing to the bouyancy of the hot zone heated by the discharges. The induced relative velocity caused by this effect is proved to be proportional to the equare root of the acceleration. Further, some applications of this spark method to evaluate the flow in the internal combustion engines are presented, of which one shows the flow patterns in the suction port and around the valve, and the other the swirls produced in the cylinder and in the swirl chamber.
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