Performance Improvement of a CNG-Fuelled Spark Ignited Engine by Hydrogen Addition

Compressed Natural Gas (CNG) has been regularly used as a fuel for transportation sector. Hydrogen has been found to posse the unique feature close to that of a zero emission vehicles. Mixture of CNG and Hydrogen can further improve the performance and emission characteristics of a CNG-fuelled engine. This paper describes the results of an experimental study carried out on a spark ignition engine in the Engines and Unconventional Fuels Lab of Centre for Energy Studies in Indian Institute of Technology, Delhi. It has been observed that addition of 10% and 15% hydrogen on energy basis to operate a CNG-fuelled engine significantly improves the performance and emission characteristics of the system.