Mixture distribution measurement using laser induced breakdown spectroscopy in hydrogen direct injection stratified charge

• Published in: International journal of hydrogen energy 2009-03, Vol.34 (5), p.2488-2493
• Main Authors: Shudo, Toshio, Oba, Shuji
• Format: Article
• Language: English
• Subjects: Applied sciences; Charge; Cooling; Cooling loss; Energy; Energy. Thermal use of fuels; Engines and turbines; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel injection; Hydrogen engine; Hydrogen storage; Laser induced breakdown; Laser induced breakdown spectroscopy; Mixture distribution; Reduction; Spectroscopy; Stratified charge; Thermal efficiency
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2009.01.012

Reduction in cooling loss due to the heat transfer from burning gas to the combustion chamber wall is very important for improving the thermal efficiency in hydrogen engines. The previous research has shown that the direct injection stratified charge can be a technique to reduce the cooling loss and improve thermal efficiency in hydrogen combustion. For effective reductions in cooling loss by the stratified charge, it is very important to know the relation between the fuel injection conditions and mixture distribution. The current research employs the laser induced breakdown spectroscopy as a method to measure the hydrogen concentration distribution in the direct injection stratified charge. Measurement of instantaneous local equivalence ratio by the method clears the characteristics of mixture formation in hydrogen direct injection stratified charge. This research also tries to actively control the mixture distribution using a split fuel injection.