Reduction of Cooling Loss in Hydrogen Combustion by DI Stratified Charge

Abstract

The research proposes reduction of cooling loss in hydrogen combustion by direct injection stratified charge, and analyzes its characteristics. The stratified charge combustion in the research adopts direct fuel injection into lean mixture and spark ignition. The stratification is controlled by a fraction of directly injected fuel to the totally supplied fuel. A lowered temperature of the burning gas around the combustion chamber wall due to the lean mixture by the stratification is expected to reduce effectively the cooling loss from burning gas to the wall. The characteristics are analyzed in a constant volume combustion vessel by using measured pressure data and burned gas compositions. Flame propagation is also observed by shlieren photography.