Technical Paper
Equivalence Ratio Measurement using LIBS in Hydrogen Direct Injection under Mixture Formation Time
2024-04-09
2024-01-2623
Hydrogen exhibits the notable attribute of lacking carbon dioxide emissions when used in internal combustion engines. Nevertheless, hydrogen has a very low energy density per unit volume, along with large emissions of nitrogen oxides (NOx) and the potential for backfire. Thus, stratified charge combustion (SCC) is used to reduce NOx and increase engine efficiency. SCC may expand the lean limit, however mixture formation time (MFT) affects combustion stability. Therefore, quantifying the equivalence ratio under MFT is critical since it determines combustion characteristics. A research investigation was conducted to evaluate the viability of using a Laser Induced Breakdown Spectrometer (LIBS) for measuring the jet equivalence ratio. Furthermore, study was conducted to analyze the effect of MFT and the double injection parameter, namely the dwell time and split ratio, on the equivalence ratio.