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一、序言研究内燃机气缸内的气体流动状态是有关改善性能和排气净化的重要课题,而其首要的问题是解决气流状态的测定方法。以前曾研究过使用碳粉或镁等固体粒子的方法、火花电离法、重复放电法等测定方法,但用它们测定气缸内部的气体流动状态和速度并不理想。采用四聚乙醛作为示踪介质,对气体流动的跟踪性能好,而且适于摄影。因此,利用它详细测量整个气缸内气体的流速和状态都很方便。然而对于使用这种示踪介质时的跟踪性来说,还没有详细研究过。
I. INTRODUCTION It is an important issue to study the gas flow in the cylinder of an internal combustion engine to improve the performance and purify the exhaust gas. The primary problem to be solved is to solve the problem of determining the state of gas flow. In the past, methods of measuring solid particles such as carbon powder or magnesium, spark ionization methods, and repeated discharge methods have been studied. However, it is not desirable to use them to measure the gas flow state and speed inside the cylinder. With the use of tetraacetals as tracer media, it has good tracking of gas flow and is suitable for photography. Therefore, it is convenient to use it to measure the flow rate and state of the gas in the entire cylinder in detail. However, the traceability when using such a tracer medium has not been studied in detail.