In order to put the hydrogen fueled engines with external mixture formation into practice, it is quite necessary to find out the cause of backfire and the countermeasures. For the sake, much research work has been carried out on the mechanism of backfire. But no research work has ever explained the cause of backfire completely. So, this study has been made on the mechanism of backfire using a test engine. It has been found that one of the causes of backfire is attributed to the electric discharge which occur after the ignition of the spark plug when the presure in the cyliner becomes low enough to descharge the electric charge which remains in the ignition system during the exhaust stroke and the intake stroke. Because the electric charge in the spark plug cable remains much more when hydrogen is used as a fuel than when gasoline is used. In other words, the number of the ions produced from hydrogen-air combustion after the ignition of spark plug is less than that of the ions made from gasoline-air combustion, so that the ion current is difficult to flow out through the gap of spark plug. It has been found i the experiment that backfire take place when the electric discharge occurs during the intake stroke and that engine operation could be performed up to excess air ratio lambda=1 without any backfire when the ignition system was modified in such away that no electric charge remained in the spark plug cable.
A study on the mechanism of backfire in external mixture formation hydrogen engines
Untersuchung des Nachzündungsmechanismus in Wasserstoffmotoren mit externer Gemischbildung
1996
10 Seiten, 9 Bilder, 1 Tabelle, 4 Quellen
Conference paper
English
Study on mechanism of backfire in hydrogen engines
Automotive engineering | 1994
|Study on Mechanism of Backfire in Hydrogen Engines
British Library Conference Proceedings | 1994
|Study on Mechanism of Backfire in Hydrogen Engines
SAE Technical Papers | 1994
|