Abstract
Reduction of the cooling loss by the heat transfer from the burning gas to the combustion chamber wall is very important for improving the thermal efficiency in hydrogen combustion engines. The previous research by the author proposed the direct injection stratified charge for a technique to reduce the cooling loss in hydrogen combustion and shown its high effect of the cooling loss reduction by experiments in a constant combustion chamber. However, it is known that a reduced cooling loss reduction does not always lead to an improved thermal efficiency in conventional gasoline engines because of an increased exhaust heat loss. This research analyzed the relation between the cooling loss and the exhaust loss in a hydrogen combustion engine.
